About ST
Products
Applications
Support
Buy
News & Events
ST Worldwide
Contact Us
Login
Application Notes
|
Industrial
|
Lighting Control
|
AC-DC Conversion
|
High Voltage Converters
VIPower: offline constant current LED driver using VIPer12/22A
Application Note
Format:
(643 kb)
or
(52 kb)
Last Updated: 23/10/2008
Pages: 45
Related Data Briefs
100 W 3-phase inverter for BLDC sensorless motor evaluation board
6 W isolated flyback topology power supply evaluation board based on VIPer12A-E
Dimmable driver for HB power LEDs with VIPER22A-E (DALI connector)
Non-isolated offline power supply demonstration board based on the VIPER22A-E
VIPer12A-E off line, constant current driver for high intensity LEDs
VIPer22A-E dual-output evaluation board with 90 to 264 VAC input and 10 W output
VIPer22A-E off line, constant current driver for high intensity LEDs
Related Datasheets
Low Power OFF-Line SMPS Primary Switcher
Raw Ascii Text
- (
Hide
)
(Unformatted textual content of the document used by search engines)
AN1916 Application note
VIPower : Offline constant current LED driver using VIPer12/22A
Introduction
High brightness LEDs are becoming a prominent source of light and often have better efficiency and reliability when compared to that of conventional light sources. While LEDs can operate from an energy source as simple as a battery and resistor, most applications require an efficient energy source not only for the reduction of losses, but also for the lumen maintenance of the LED itself. Using integrated off line switching regulators like the VIPer12A and VIPer22A in a constant current configuration, a low cost, high efficient LED driver for multiple LEDs has been developed. This document introduces the isolated and non-isolated offline constant current LED driver based on the VIPerX2A family. All three LED driver configurations operate in the extended wide range input voltage, from 90 to 264Vac. VIPer12A and VIPer22A are low cost monolithic smart power devices with integrated PWM controllers. Their internal control circuit offers benefits such as automatic burst mode in low load condition, overvoltage protection in hiccup mode, and large voltage range on the VDD pin. An isolated VIPer12A constant current LED driver has been configured to drive 1 to 4 LEDs while the isolated VIPer22A configuration has been optimized for 2 to 8 LEDs.
VIPer12A constant current LED driver board layout
August 2006
Rev4
1/45
www.st.com
Contents
AN1916
Contents
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 LED parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 LED Intensity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Design consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Board description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Transformer specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Current selectable reference board . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 General circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 EMI results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Current regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Ripple current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 1.8" Round LED board configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Round LED board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 EMI result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Current regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Ripple current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Low cost option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2/45
AN1916
Contents
19 20 21
PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3/45
List of figures
AN1916
List of figures
Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Figure 20. Figure 21. Figure 22. Figure 23. Figure 24. Figure 25. Figure 26. Figure 27. Figure 28. Figure 29. Figure 30. Figure 31. Figure 32. Figure 33. Figure 34. Current vs. LUX and VF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Mechanical characteristics of the transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 VIPer12A current selectable LED driver schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 VIPer22A current selectable LED driver schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 VIPer12A constant current (350mA) LED driver schematic . . . . . . . . . . . . . . . . . . . . . . . . 17 VIPer22A constant current (350mA) LED driver schematic . . . . . . . . . . . . . . . . . . . . . . . . 19 VIPer12A constant current (700mA) LED driver schematic . . . . . . . . . . . . . . . . . . . . . . . . 21 VIPer22A constant current (700mA) LED driver schematic . . . . . . . . . . . . . . . . . . . . . . . . 23 VIPer12A constant current (1.05A) LED driver schematic . . . . . . . . . . . . . . . . . . . . . . . . . 25 VIPer22A constant current (1.05A) LED driver schematic . . . . . . . . . . . . . . . . . . . . . . . . . 27 Board top side (not in scale) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Board bottom side viewed from top side (not in scale) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 VIPer12A with 1 LED at output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 VIPer12A with 4 LEDs at output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 VIPer22A with 2 LEDs at output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 VIPer22A with 8 LEDs at output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 VIPer12A EMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 VIPer22A EMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 VIPer12A current regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 VIPer22A current regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Ripple at 264Vac (VIPer12A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Ripple at 264Vac (VIPer22A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Top Side of Board (not in scale) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Bottom Side of Board (not in scale) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Top board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Bottom board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 VIPer22A round LED EMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 VIPer12A round LED EMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 VIPer22A round LED board current regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 VIPer12A round LED board current regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Ripple Current at 264Vac input (VIPer22A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Ripple Current at 264Vac input (VIPer12A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Non-isolated buck configuration schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 VIPer22A buck board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4/45
AN1916
List of tables
List of tables
Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Table 15. Table 16. Table 17. Table 18. Table 19. Table 20. Electrical characteristics at 350mA, junction temperature, TJ = 25 C . . . . . . . . . . . . . . . . . 6 Flux characteristics at 350mA, junction temperature, TJ = 25 C. . . . . . . . . . . . . . . . . . . . . 7 1 to 4 LEDs system at 350mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2 to 8 LEDs system at 350mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 VIPer12A LED system at 700mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 VIPer12A LED system at 1.05A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 VIPer22A LED system at 700mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 VIPer22A LED system at 1.05A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Number of LEDs that can be driven . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 BOM change for VIPer22A 350mA solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Bill of matarials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5/45
LED parameters
AN1916
1
LED parameters
LED voltage drop tolerance varies by +/- 16.6% for the white LED, as shown in Table 1. Different colors will have different typical voltage drop. For this reason, it is recommended that the LEDs be connected in series rather than parallel. If the LEDs were connected in parallel, the current flowing in each LED would depend on each unit's individual voltage drop (VF) characteristic and not be matched to the other devices, resulting in different brightness for each LED. Below is the forward voltage drop spec from the Luxeon Star Technical Data Sheet DS23 Table 1.
Color Min White Green Cyan Blue Royal Blue Red Amber 2.79 2.79 2.79 2.79 2.79 2.31 2.31 Typ. 3.42 3.42 3.42 3.42 3.42 2.85 2.85 Max 3.99 3.99 3.99 3.99 3.99 3.27 3.27
Electrical characteristics at 350mA, junction temperature, TJ = 25 C
Forward Voltage VF(V) Dynamic Resistance ()RD 1.0 1.0 1.0 1.0 1.0 2.4 2.4 Temperature Coefficient of Forward Voltage (mV/C)
VF/TJ
-2.0 -2.0 -2.0 -2.0 -2.0 -2.0 -2.0
6/45
AN1916
LED Intensity
2
LED Intensity
The intensity of the brightness also varies with different color as shown in the Luxeon data sheet. Table 2. Flux characteristics at 350mA, junction temperature, TJ = 25 C
Color White Green Cyan Blue Royal Blue Red Amber Minimum Luminous Flux (lm) or Radiometric Power (MW) V 13.9 13.9 13.9 3.8 55MW 13.9 10.7 Typical Luminous Flux (lm) Or Radiometric Power (MW) V 25 30 30 10 150MW 27 25
The brightness is directly related to the current driving the LED. A test was conducted in a closed box with a white LED mounted 12 inches away from the light meter. The results showed a linear relationship between current and light output as shown in Figure 1. Figure 1. also shows the relation between current and forward drop of the LED.
7/45
Design consideration
AN1916
3
Design consideration
The main consideration in designing this constant current power supply is the transformer. Since one to four LEDs can be operated, and each LED is 3.5V nominal, the output can vary from 3.5V to 14V. The output voltage will be reflected back across the transformer and will in turn change the Vdd voltage to the control circuit and the peak Vds voltage across the MOSFET. The transformer must be designed with three limiting factors in mind.
Vdd, which has a range of 9V for under voltage to 38V for the over voltage threshold. Wattage, specified at 8W for the VIPer12A and 12W for the VIPer22A Reflected voltage across the drain of the MOSFET which is the turn ratio of (Np ÷ Ns) x Vout, added to the input voltage and must be below 730V. Current vs. LUX and VF
Figure 1.
In order to keep the reflected voltage manageable, the transformer is designed for a turn's ratio of primary to secondary output voltage for the maximum number of LEDs. Using this criteria, as the number of LEDs is reduced, so is the reflected voltage. If the transformer were based on one LED then the reflected voltage would quadruple with four LEDs and may exceed the rating of the VIPer. The turn's ratio between secondary to the Vdd winding is set for an output voltage of one LED to the minimum Vdd voltage, of 9V. As more LEDs are added, the Vdd voltage increases proportionally until it reaches the overvoltage shutdown point of 42V nominal. With this starting point a table can be derived as shown in Table 3. for the VIPer12 and Table 4. for VIPer22A. The highlighted values indicate parameters that are approaching the limit for that parameter. The following table shows the results of the parameters that should be considered for the proper design.
8/45
AN1916 Table 3.
# of LEDs 1 2 3 4 5
Design consideration 1 to 4 LEDs system at 350mA
Output voltage at 350mA [1] 3.57 6.99 10.41 13.83 17.25 Vdd 10.05 18.33 26.60 34.87 43.15 Output Wattage 1.25 2.45 3.64 4.85 6.04 Vds not V reflected including spike at 375Vdc 30.51282 59.74359 88.97436 118.2051 147.4359 405.5128 434.7436 463.9744 493.2051 522.4359 Turns ratio Ns/Np 0.117 Nvdd/Ns 2.419
1
The output voltage includes 0.175V drop in the current sense resistor. In the case of Table 3., the Vdd would be the limiting factor reaching the over voltage shut down point. In the case of Table 4., the Vdd would be the limiting factor reaching the overvoltage shutdown point. The turn ratio of primary to secondary is based on the highest output voltage for 8 LEDs. The VIPer12A and VIPer22A are ideal for this application because of the wide range of Vdd. This ranges from 8 to 42V typical. The overvoltage kicks in at 42V, preventing the addition of LEDs driving the output voltage, the voltage across the drain to source and the wattage, from being exceeded. Table 4.
# of LEDs 2 3 4 5 6 7 8 9
2 to 8 LEDs system at 350mA
Output voltage at 350mA [2] 6.99 10.41 13.83 17.25 20.67 24.09 27.51 30.93 Vdd 10.63 15.67 20.71 25.75 30.79 35.84 40.88 45.92 Output Wattage 2.45 3.64 4.84 6.04 7.23 8.43 9.63 10.83 Vds not V reflected including spike at 375Vdc 33.12796 49.33649 65.54502 81.75355 97.96209 114.1706 130.3791 146.5877 408.128 424.3365 440.545 456.7536 472.9621 489.1706 505.3791 521.5877 Turns ratio 0.211 Nvdd/Ns 1.474
2
The output voltage includes 0.175V drop in the current sense resistor. The circuit shown in Figure 5. can drive from 1 to 4 LEDs. The circuit shown in Figure 6. can drive from 2 to 8 LEDs. Table 3. and Table 4. are based on the nominal voltage drop for a white LED as stated in the LED datasheet shown earlier. The actual number of LEDs that can be driven depends on the VF spread of the type of LEDs used and the Vdd range (9V to 38V) when worse case conditions are taken into account. Worse case parameters must be considered for a robust design. If the design calls for a fixed number of LEDs, then the only limiting factor is the VIPer's maximum output power capability. Table 5. to Table 8. will show the same measurements taken with 700mA and 1.05A at the output for VIPer12A and VIPer22A circuit configurations. Here, the limiting factor is the maximum output power that can be attained from VIPer12A and VIPer22A with 6W maximum and 10W maximum output power respectively.
9/45
Design consideration
AN1916
Table 5.
VIPer12A LED system at 700mA
Vdd 13.22 23.42 Output Wattage 2.61 5.10 V reflected 30.51282 59.74359 Vds not including spike at 375Vdc 433 464 Turns ratio Ns/Np 0.117
Output # of LEDs voltage at 700mA 1 2 3.67 7.15
Table 6.
VIPer12A LED system at 1.05A
Vdd 13.49 Output Wattage 3.49 V reflected 30.51282 Vds not including spike at 375Vdc 430 Turns ratio Ns/Np 0.117
Output # of LEDs voltage at 1050mA 1 3.42
Table 7.
# of LEDs 2 3 4
VIPer22A LED system at 700mA
Output voltage at 700mA 7.18 10.48 13.48 Vdd 11.75 16.72 21.2 Output Wattage 5.026 7.336 9.436 V reflected 33.12796 49.33649 65.54502 Vds not including spike at 375Vdc 433 447 461 Turns ratio 0.211
Table 8.
VIPer22A LED system at 1.05A
Vdd 11.5 Output Wattage 6.951 V reflected 33.12796 Vds not including spike at 375Vdc 433 Turns ratio 0.211
Output # of LEDs voltage at 1050mA 2 6.62
10/45
AN1916
Board description
4
Board description
This demonstration board is a redesign of earlier versions of the VIPer12A and VIPer22A LED driver reference designs. The board has been configured to allow the user to select the output current of 350mA, 700mA or 1.05A by using the jumpers, J2 and J4, on the board without having to change any components on the evaluation board. Table 9. below outlines the range of LEDs that can be driven depending on the version of board and type of LEDs selected: Table 9.
VIPer12A VIPer22A
Number of LEDs that can be driven
1W LED (Iout =350mA) 3W LED (Iout = 700mA) 5W LED (Iout = 1.05A) Min 1 Min 2 Max 4 Max 8 M in 1 M in 2 Max 2 Max 4 M in 1 M in 2 Max 1 Max 2
Board Version
On the evaluation board, the value of the sense resistor is selected by jumpers J2 and J3. When both J2 and J3 are open, the sense resistor is set to 0.5 making the output current 0.35mA. When either J2 or J3 is shorted, the output sense resistor is fixed to 0.25 making the output current 700mA. With both J2 and J3 shorted, the output current will be set to 1.05A.
11/45
Transformer specifications
AN1916
5
Transformer specifications
The transformer is designed and manufactured by Cramer Coil and Transformer Co. The electrical characteristics of the transformer are as follows:
Primary Inductance: 3.25mH +/-10% Primary Leakage Inductance: 39.9H typical HIPOT (N1, N3, N4 to N2): 4000VAC, 1Sec Turns Ratio (N1/N4:N2): 1:0.117 Turns Ratio (N1/N4:N3): 1:0.283
When the VIPerx2A (U4) is on, energy is stored in the primary winding of transformer (8-10), T1. This energy is transferred to the auxiliary winding (5-6), and to the output (1-2) when the VIPerx2A turns off. The auxiliary winding provides the bias voltage for the VIPerx2A at pin 4 (Vdd). Figure 2. Mechanical characteristics of the transformer
An alternate source for the transformer is Midcom, Inc. The part number for the transformer on the VIPer12A LED and VIPer22A LED board are 31929 and 31928 respectively. Further information and samples could be obtained from http://www.midcom-inc.com.
12/45
AN1916
Current selectable reference board
6
Current selectable reference board
The evaluation board is designed to display the full functionality of VIPer12A and VIPer22A as LED drivers to drive 1W, 3W as well as 5W LEDs at wide range input voltage. The components selected are optimized for 5W LED driver application. The following pages contain the schematics and bills of materials that reflect the components used on the boards. Based on this circuit, there are six different configurations with different output power level that could be derived by making minor components changes to the evaluation board. The subsequent pages will show the schematics and bills of materials for the circuit to drive 1W, 3W and 5W LEDs. Figure 3. VIPer12A current selectable LED driver schematic
R 10 1K J2 Ju m p er LED C8 0 .1 u F R 11 1K
1 2 1 2
J4 5 3 5 6 7 6 -5
J3 Ju m p e r
8
7
6
1 /2 W 2
2
Ve 2 -
Vcc
0 .5 1 /2W
Ve 2 +
Ou t2
5
TS M1 0 3
R13
2
2
R 9 2 .2 K 1
0 .5 1 /2W
0 .5 1/2 W
R12
R14
1
Ou t1
LED +
Ve 1 -
C7 220uF 25V
1
2
3
+
S TT H 1 5 2
R4 100 5% 1 /4 W
U3
D3
R 15 24K
C ra m e r CVP11-047 1 1
2
4 .7 n F
C5
2
10
8 5
6
8 5
10
6
1
6 .2 k 5% 1 /4 W
W1
R3
C4 22uF 50V
0
R8 10 1 /4 W 5%
D2 STTH10 2
4
3
+
U4
S o u rce To vl Fb
D ra i n D ra i nVd d D ra i n D ra i n
C10
8 7 6 5
1 2
VIP e r1 2 A
R2
100 5% 1 /2 W
+
C2 10uF 400V
C3 47pF 1kV
11 W /4W
6 .8 5%
R1
FU S E
F1
J1 2 1
C11 0 .0 4 7 u F
2
C1 4 .7 u F 400V D1 600V,1A DF06MGI
1
+
C om po s ta r45 m H
L1
.
0
0
C6 0 .3 3 u F 50V
2
R 16 2 .2 K
4
Gn d
Vre f
1
1
R7 10K
U2
R5 750
1
2
2
3
1
4
2 1 2
2 1 1 1 4
3
2
3
1 2 3 4 5 6
.
4
13/45
Current selectable reference board
AN1916
Table 10.
Bill of materials
Part Description Mfg P/N Mfg Compostar Compostar Panasonic Panasonic Panasonic Panasonic Panasonic Radial 1206 Axial ECQ-U2A473MG DB105 STTH102 STTH152 3720500041 MKDSN1.5/2 22-28-8020 535676-5 FUU10S-V24503Q22650 Carbon Composition Panasonic Micro Commercial STMicroelectronics STMicroelectronics Wickman Phoenix Contact Molex Tyco Compostar Axial Axial Axial Axial 1206 Axial Axial Axial Axial 1206 Axial 1206 1206 CVP11-047 Cramer Coil 6 Pin Radial Radial Geometry Radial Radial Mounting TH TH TH TH TH TH TH SMD TH TH TH Axial DO-41 TH Axial DO-15 TH Radial TH TH TH TH TH TH TH TH TH SMD TH TH TH TH SMD TH SMD SMD TH
Qty Reference 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 3 1 1 1 C1 C2 C3 C4 C5 C6 C7 C8 C10 C11 D1 D2 D3 F1 J1 J2, J3 J4 L1 R1 R2 R3 R4 R5 R7 R8 R9 R10 R11 R12, R13, R14 R15 R16 T1
4.7uF 400V Electrolytic TKR2GM4R7D 10uF 400V Electrolytic 47pF 1kV Ceramic 22uF 50V Electrolytic 4.7nF 250V Ceramic 0.33uF 50V Ceramic 220uF 25V Electrolytic 0.1uF 50V Ceramic 22Ga solid bus wire 0.047uF 250V boxcap DIPBridge 600V 1A STTH102 diode STTH152 diode Fuse TR5 0.5A Phoenix 2 Pin Connector Current Select Jumper Stackable Receptacle 45mH common mode choke 6.8 5% 1/4W 100 5% 0.5W 6.2 5% 0.25W 100 5% 0.25W 750 5% 0.25W 10k 5% 0.25W 10 5% 0.25W 2.2k 5% 0.5W 1k 5% 0.25W 1k 5% 0.25W 0.5 5% 0.5W 24k 5% 0.25W 2.2k 5% 0.25W Cramer Transformer TKR2GM100D ECC-D3A470JGE EEU-FC1H220 ECK-DNA472ME ECU-S1H334KBB EEU-FC1E221
14/45
AN1916
Table 10.
1 1 1 1 U3 U2 U4 Qty Reference W1
Bill of materials
Figure 4.
VIPer12A Optocoupler
F1
R1
Part Description
22 Ga solid bus wire
FU S E J4 5 3 5 6 7 6 -5 D3 LED + LED -
5Ohms
4
6 .8 5% 1W
J1 2 1 1 10
1
C11 0 .0 4 7 u F 10 S TTH 1 5 2 2
+
2 2
C ra m e r CVP11-046 1 1
3
2
D4 PKC -1 3 6
+
+
3
4
1
Dual OpAmp & Voltage TSM103ID Ref.
R2
2
.
C3 47pF 1kV 100 5% 1 /2 W R8 51 1 /4 W 5% 6 6 1 W1 C5 2 4 .7 n F 0 4 R3 1 1 0 .5 1 /2W 2 R 13 0 D2 S TTH 1 0 2 8 5 8 5
VIPer12ADIP
C1 10uF D1 400V DF06MGI 600V, 1A C o m p o s ta r45 m H L1
C2 10uF 400V
C7 220uF 1 R12 2 50V 0 .5 1 /2W
1 2 3 4 5 6
1
2 1
2
H11A817A/LTV817A
1
0 .5 1/2 W
2 1
4
8 7 6 5
1
6 .2 k 5% 1 /4 W
3
2
1 2 S o u rce To vl Fb 3
+
2
2
1 C 10 C 12 N .U VIP e r2 2 A C4 22uF 50V 1 2 U2 Ou t1
2 2 .2 K 1 /2 W Vcc 8
2
1
1
1
2
VIPer22A current selectable LED driver schematic
.
J2 Ju m pe r 2 J3 Ju m p e r R 14 U4 D ra i n D ra i nVd d D ra i n D ra i n R15 U 3 24k 1 /4 W R4 100 5% 1 /4 W R9 R11 1K 7 Ve 1 3 4 Vre f Gn d R16 2 .2 k 1 /4 W Ou t2 Ve 2 Ve 2 + TS M1 0 3 R7 10K 6 5 0 C6 0 .3 3 u F 50V R5 750
Mfg P/N Mfg
Fairchild/LiteOn
STMicroelectronics
STMicroelectronics
C8 0 .1 u F
R 10 1K
1/ 4W %
SO8
Current selectable reference board
Axial TH
4 Pin DIP TH
8 Pin DIP TH SMD
Geometry Mounting
15/45
Current selectable reference board
AN1916
Table 11.
Bill of materials
Part Description 10uF 400V Electrolytic 47pF 1kV Ceramic 22uF 50V Electrolytic 4.7nF 250V Ceramic 0.33uF 50V Ceramic 220uF 50V Electrolytic 0.1uF 50V Ceramic 22Ga solid bus wire 0.047uF 250V boxcap DIPBridge 600V 1A STTH102 diode STTH152 diode Peak Clamp Fuse TR5 0.5A ECQ-U2A473MG DB105 STTH102 STTH152 PKC136 3720500041 Panasonic Micro Commercial Mfg P/N TKR2GM100D ECC-D3A470JGE EEU-FC1H220 ECK-DNA472ME ECU-S1H334KBB EEU-FC1H221 Mfg Compostar Panasonic Panasonic Panasonic Panasonic Panasonic Radial 1206 Axial Radial Radial Geometry Radial Mounting TH TH TH TH TH TH SMD TH TH TH
Qty Reference 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 3 1 1 1 1 C1, C2 C3 C4 C5 C6 C7 C8 C10 C11 D1 D2 D3 D4 F1 J1 J2, J3 J4 L1 R1 R2 R3 R4 R5 R7 R8 R9 R10 R11 R12, R13, R14 R15 R16 T1 U2
STMicroelectronics Axial DO-41 TH STMicroelectronics Axial DO-15 TH STMicroelectronics Axial DO-15 TH Wickman Phoenix Contact Molex Tyco Compostar Axial Axial Axial Axial 1206 Axial Axial Axial Axial 1206 Axial 1206 1206 6 Pin Radial TH TH TH TH TH TH TH TH TH SMD TH TH TH TH SMD TH SMD SMD TH TH
Phoenix 2 Pin Connector MKDSN1.5/2 Current Select Jumper Stackable Receptacle 45mH common mode choke 5 5% 1W wire wound 100 5% 0.5W 6.2k 5% 0.25W 100 5% 0.25W 750 5% 0.25W 10k 5% 0.25W 51 5% 0.25W 2.2k 5% 0.5W 1k 5% 0.25W 1k 5% 0.25W 0.5 5% 0.5W 24k 5% 0.25W 2.2k 5% 0.25W Cramer Transformer VIPer22A CVP11-046 VIPer22ADIP 22-28-8020 535676-5 FUU10S-V24503Q22650
Cramer Coil STMicroelectronics 8 Pin DIP
16/45
AN1916
Table 11.
1 U4 U3 Qty Reference W1
1
1
Bill of materials
Figure 5.
Optocoupler
F1
R1
FU S E
4
22 Ga solid bus wire
Part Description
Dual OpAmp & Voltage Ref.
1/4W 1W
6 .8 5%
J1
1 10 10 1 1
C ra m e r CVP11-047 D3 S TTH 1 0 2
+
1
2 1
C11 0 .0 4 7 u F X cap 0.35A (3.5V - 14V)
1 2
2
J2
21T
3 2
2 +
2
+
4 1
3
D1 600V,1A DF06MGI 180T R2 C3 47pF 1kV
2
.
8 5 8 5
TSM103ID
C1 4 .7 u F 400V 100 5% 1 /2 W 51T
6 6
1
Mfg P/N
L1 C om pos tar45m H 0 D2
1
2
H11A817A/LTV817A
4
8 7 6 5 Vdd
1
3
Sourc e Sourc e Fb + 3
R9 R1 5 24K 1/4W
1 Out 1
2.2K 1/2W
2
1 2
2
C4 22uF 50V
Mfg
Fairchild/LiteOn
0
C6 0 .3 3 u F 50V
2 3 4
U2
Ve1Vref Gnd
Vc c Out 2 Ve2Ve2+
8 7 6 5
1
VIPer12A constant current (350mA) LED driver schematic
.
C2 10uF 400V R6 0 .5 1/2W C7 220uF 25V R8 10 1 /4 W 5% W1 C5
2
STTH 102 Y cap 4 .7 n F 0 R3
4
U4
D rain D rain D rain D rain
R4 100 5% 1 /4 W U3 H11A817A
6 .2 k 5% 1 /4 W
R 11 1K C8 0 .1 u F
R 10 1K 1/4W
VIPer12A
R16 2.2K 1/4W
TS M1 0 3 R7 10K
STMicroelectronics SO8
Current selectable reference board
Axial
4 Pin DIP
Geometry
R5 750
TH
TH
SMD
Mounting
17/45
Current selectable reference board
AN1916
Table 12.
Bill of material
Part Description 4.7uF 400V Electrolytic 10uF 400V Electrolytic 47pF 1kV Ceramic 22uF 50V Electrolytic 4.7nF 250V Ceramic 0.33uF 50V Ceramic 220uF 25V Electrolytic 0.1uF 50V Ceramic 0.047uF 250V boxcap DipBridge 600V 1A STTH102 Diode STTH102 Diode Fuse TR5 0.5A Phoenix 2 PIN Connector 45mH common mode choke 6.8 5% 1/4W 100 5% 0.5W 6.2k 5% 0.25W 100 5% 0.25W 750 5% 0.25W 0.5 5% 0.5W 10k 5% 0.25W 10 5% 0.25W 2.2k 5% 0.5W 1k 5% 0.25W 24k 5% 0.25W 2.2k 5% 0.25W Cramer Transformer Dual OpAmp&Voltage Ref. Optocoupler VIPer12A 22 Ga Solid Bus Wire CVP11-047 TSM103ID Cramer Coil STMicroelectronics SO8 4 Pin DIP Mfg P/N TKR2GM4R7D TKR2GM100D ECC-D3A470JGE EEU-FC1H220 ECK-DNA472ME ECU-S1H334KBB EEU-FC1E221 ECU-S1H104BB ECQ-U2A473MG DB105 STTH102 STTH102 3720500041 MKDSN1.5/2 FUU10S-V24503Q22650 Carbon Composition Mfg Compostar Compostar Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Micro Commercial Radial Radial Radial Geometry Radial Radial Mounting TH TH TH TH TH TH TH TH TH TH
Qty Reference 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 C1 C2 C3 C4 C5 C6 C7 C8 C11 D1 D2 D3 F1 J1, J2 L1 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10, R11 R15 R16 T1 U2 U3 U4 W1
STMicroelectronics Axial DO-41 TH STMicroelectronics Axial DO-41 TH Wickman Phoenix Contact Compostar Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial Radial TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH SMD TH TH TH
H11A817A/LTV817A Fairchild/LiteOn VIPer12A DIP
STMicroelectronics 8 PIN DIP
18/45
AN1916 Figure 6.
F1
R1
FU S E
4
5Ohms
6 .8 5% 1W
J1
1 10 10 1 1
C ra m e r CVP11-046 D3 S TT H 1 0 2
+
2
0.35A (7V - 27.5V)
J2
1 2
2 1
C11 0 .0 4 7 u F X cap
1
38T
2 2
3
2
D4 PKC -1 3 6
+
180T R2
2
8 5 8 5
3
4
1
D1 600V,1A DF06MGI
+
.
C3 47pF 1kV 100 5% 1 /2 W 56T
6 6
C2 10uF 400V
C7 220uF 50V
1
C1 10uF 400V R8 51 1 /4 W 5%
1
L1 C o m p os ta r45 m H 0 D2
1 2
W1 C5 Y cap 4 .7 n F 0 R3
STTH1 02
2
U4
Vdd 4 8 7 6 5 D rain D rain D rain D rain
R4 100 5% 1 /4 W
4 1
6 .2 k 5% 1 /4 W
Fb + 3
U3 H11A817A
3 2
Sourc e Sourc e
1
R9 2 .2 K R15 24k C6 0 .3 3 u F 50V
1 2
2
2
1 2
2
C4 22uF 50V
Out 1 Ve1-
Vc c Out 2
8 7
1
VIPer22A constant current (350mA) LED driver schematic
.
VIPe r22 A 0 R16 2 .2k
R6 0 .5 1 /2 W
U2
1 /2 W
R11 1K C8 0 .1 u F
3 4 Vref Gnd Ve2Ve2+ 6 5
R 10 1K 1/4W
TS M1 0 3 R7 10K
Current selectable reference board
R5 750
19/45
Current selectable reference board
AN1916
Table 13.
Bill of materials
Part Description 10uF 400V Electrolytic 47pF 1Kv Ceramic 22uF 50V Electrolytic 4.7nF 250V Ceramic 0.33uF 50V Ceramic 220uF 50V Electrolytic 0.1uF 50V Ceramic 0.047uF 250V boxcap DipBridge 600V 1A STTH102 diode Peak Clamp Fuse TR5 0.5A Phoenix 2 Pin Conn 45mH common mode choke 5 5% 1W 100 5% 0.5W 6.2k 5% 0.25W 100 5% 0.25W 750 5% 0.25W 0.5 5% 0.5W 10k 5% 0.25W 51 5% 0.25W 2.2k 5% 0.5W 1K 5% 0.25W 24k 5% 0.25W 2.2k 5% 0.25W Cramer Transformer Dual OpAmp & Voltage Ref. Optocoupler VIPer22A 22 Ga solid bus wire CVP11-046 TSM103ID Compostar STMicroelectronics SO8 4 Pin DIP Mfg P/N TKR2GM100D ECC-D3A470JGE EEU-FC1H220 ECK-DNA472ME ECU-S1H334KBB EEU-FC1H221 ECU-S1H104BB ECQ-U2A473MG DB105 STTH102 PKC136 3720500041 MKDSN1.5/2 FUU10S-V24503Q22650 Wirewound Mfg Compostar Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Micro Commercial Radial Radial Geometry Radial Mounting TH TH TH TH TH TH TH TH TH
Qty Reference 2 1 1 1 1 1 1 1 1 2 1 1 2 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 C1, C2 C3 C4 C5 C6 C7 C8 C11 D1 D2, D3 D4 F1 J1, J2 L1 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10, R11 R15 R16 T1 U2 U3 U4 W1
STMicroelectronics Axial DO-41 TH STMicroelectronics Axial DO-15 TH Wickman Phoenix Contact Compostar Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial Radial TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH SMD TH TH TH
H11A817A/LTV817A Fairchild/LiteOn VIPer22ADIP
STMicroelectronics 8 Pin DIP Axial
3
The following components are changed for the VIPer22A constant current (350mA) LED driver configuration from the VIPer12A constant current (350mA) LED driver configuration.
20/45
AN1916
1
1
1
1
1
1
Figure 7.
Table 14.
Quantity
F1
R8
C7
C1
T1
U4
D4
R1
FU S E
4
1/4W 1W
6 .8 5%
J1
10 10 1 1
C ra m e r CVP11-047 D3 S TTH 1 0 2
+
1
2 1
C11 0 .0 4 7 u F X cap 21T
3 2
2 1 2
1
0.7A J2
LED +
Reference
2 +
2
+
4 1
3
D1 600V,1A DF06MGI
.
R2 C3 47pF 1kV 100 5% 1 /2 W 51T
6 6
1
C1 4 .7 u F 400V
8 5
R8 10 1 /4 W 5% LED W1 C5
2 1
2
L1 C om p os ta r45 m H 0 D2 STTH 10 2 Y cap 4 .7 n F 0 R3
Vdd
4 1
U4
8 7 6 5 D rain D rain D rain D rain 4
51 5% 0.25W
R4 100 5% 1 /4 W U3 H11A817A
6 .2 k 5% 1 /4 W
3
Sourc e Sourc e Fb + 3
BOM change for VIPer22A 350mA solution
1
R 9 1 /2 W 2 .2 K
2
2
1 2
2
2
1
VIPer12A constant current (700mA) LED driver schematic
.
C2 10uF 400V
8 5
180T C7 220uF 25V R6 0 .2 5 1 /2 W
R 11 1K
1 2 3 4 8 Out 1 Ve1Vref Gnd Vc c
R1 0 1K 1/4 W C8 0 .1 u F U2
Out 2 Ve2Ve2+ 7 6 5
220uF/50V electrolytic
10uF/400V electrolytic
VIPe r12 A C6 0 .3 3 u F 50V
C4 22uF 50V R15 24k 1/4W
STMicroelectronics PKC-136
STMicroelectronics VIPer22A
0
R16 2 .2 k 1/4W
TSM1 0 3 R7 10K
Description
Cramer Coil transformer CVP11-046
Current selectable reference board
R5 750
21/45
Current selectable reference board
AN1916
Table 15.
Bill of materials
Part Description 4.7uF 400V Electrolytic 10uF 400V Electrolytic 47pF 1kV Ceramic 22uF 50V Electrolytic 4.7nF 250V Ceramic 0.33uF 50V Ceramic 220uF 50V Electrolytic 0.1uF 50V Ceramic 0.047uF 250V boxcap DipBridge 600V 1A STTH102 Diode STTH102 Diode Fuse TR5 0.5A Mfg P/N TKR2GM4R7D TKR2GM100D ECC-D3A470JGE EEU-FC1H220 ECK-DNA472ME ECU-S1H334KBB EEU-FH1E221 ECU-S1H104BB ECQ-U2A473MG DB105 STTH102 STTH102 3720500041 Mfg Compostar Compostar Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Micro Commercial Radial Radial Radial Geometry Radial Radial Mounting TH TH TH TH TH TH TH TH TH TH
Qty Reference 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 C1 C2 C3 C4 C5 C6 C7 C8 C11 D1 D2 D3 F1 J1, J2 L1 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10, R11 R15 R16 T1 U2 U3 U4 W1
STMicroelectronics Axial DO-41 TH STMicroelectronics Axial DO-41 TH Wickman Phoenix Contact Compostar Axial Axial Axial Radial Radial Radial Axial Axial Axial Axial Axial Axial Radial TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH SMD TH TH TH
Phoenix 2 PIN Connector MKDSN1.5/2 45mH common mode choke 6.8 5% 1/4W 100 5% 0.5W 6.2k 5% 0.25W 100 5% 0.25W 750 5% 0.25W 0.25 5% 0.5W 10k 5% 0.25W 10 5% 0.25W 2.2k 5% 0.5W 1k 5% 0.25W 24k 5% 0.25W 2.2k 5% 0.25W Cramer Transformer Dual OpAmp&Voltage Ref. Optocoupler VIPer12A 22 Ga Solid Bus Wire CVP11-047 TSM103ID H11A817A/LTV817A VIPer12A DIP FUU10S-V24503Q22650 Carbon Composition
Cramer Coil STMicroelectronics SO8 Fairchild/LiteOn 4 Pin DIP
STMicroelectronics 8 Pin DIP
22/45
AN1916 Figure 8.
F1
R1
FU S E
4
5Ohms
6 .8 5% 1W
J1
1 10 10 1
1
C ra m e r CVP11-046
1
2 1
C11 0 .0 4 7 u F X cap D3 S TTH 1 0 2
+
2
0.7A
LED+
J2
1 2
38T
2 2
3
2
D4 PKC -1 3 6
+
180T R2
2
3
4
1
D1 600V,1A DF06MGI
+
.
8 5 8 5
C2 10uF 400V
C7 220uF 50V
1
C1 10uF 400V C3 47pF 1kV 100 5% 1 /2 W 56T
6 6
1
R8 51 1 /4 W 5% D2
1
2
LEDW1 C5
2
L1 Com p os tar45m H 0 STTH102 0 R3
Vdd 4
Y cap 4 .7 n F
U4
8 7 6 5 D rain D rain D rain D rain
R4 100 5% 1 /4 W
4 1
6 .2 k 5% 1 /4 W
Fb + 3
U3 H11A817A
3 2
Sourc e Sourc e
1
R9 2 .2 K R15 24k C6 0 .3 3 u F 50V 0 R16 2.2k
1 2 3 4
2
2
1 2
2
C4 22uF 50V
Out 1 Ve1Vref Gnd
Vc c Out 2 Ve2Ve2+
8 7 6 5
1
VIPer22A constant current (700mA) LED driver schematic
.
VIPer22 A
R6 0 .2 5 1/2W
U2
1 /2 W
R11 1K C8 0 .1 u F
R10 1K 1/4W
TS M1 0 3 R7 10K
Current selectable reference board
R5 750
23/45
Current selectable reference board
AN1916
Table 16.
Bill of matarials
Part description 10uF 400V Electrolytic 47pF 1Kv Ceramic 22uF 50V Electrolytic 4.7nF 250V Ceramic 0.33uF 50V Ceramic 220uF 50V Electrolytic 0.1uF 50V Ceramic 0.047uF 250V boxcap DipBridge 600V 1A STTH102 diode Peak Clamp Fuse TR5 0.5A Phoenix 2 Pin Conn 45mH common mode choke 5 5% 1W 100 5% 0.5W 6.2k 5% 0.25W 100 5% 0.25W 750 5% 0.25W 0.25 5% 0.5W 10k 5% 0.25W 51 5% 0.25W 2.2k 5% 0.5W 1K 5% 0.25W 24k 5% 0.25W 2.2k 5% 0.25W Cramer Transformer Dual OpAmp & Voltage Ref. Optocoupler VIPer22A 22 Ga solid bus wire CVP11-046 TSM103ID H11A817A/LTV817A VIPer22ADIP Cramer Coil STMicroelectronics SO8 Fairchild/LiteOn 4 Pin DIP Mfg P/N TKR2GM100D ECC-D3A470JGE EEU-FC1H220 ECK-DNA472ME ECU-S1H334KBB EEU-FC1H221 ECU-S1H104BB ECQ-U2A473MG DB105 STTH102 PKC136 3720500041 MKDSN1.5/2 FUU10S-V24503Q22650 Wirewound Mfg Compostar Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Micro Commercial Radial Radial Geometr y Radial Mounting TH TH TH TH TH TH TH TH TH
Qty Reference 2 1 1 1 1 1 1 1 1 2 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 C1, C2 C3 C4 C5 C6 C7 C8 C11 D1 D2, D3 D4 F1 J1, J2 L1 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10, R11 R15 R16 T1 U2 U3 U4 W1
STMicroelectronics Axial DO-41 TH STMicroelectronics Axial DO-15 TH Wickman Phoenix Contact Compostar Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial Radial TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH SMD TH TH TH
STMicroelectronics 8 Pin DIP Axial
24/45
AN1916 Figure 9.
F1
R1
FU S E
4
6 .8 5% 1 4W 1/W
J1
1 10 10 1 1
C ra m e r CVP11-047 D3 S TT H 1 5 2
+
2 1
C11 0 .0 4 7 u F X cap 21T
3 2
2
1.05A
LED +
J2
1 2
2 +
2
1
+
4 1
3
D1 600V,1A DF06MGI 180T R2 C3 47pF 1kV 100 5% 1 /2 W 51T
6 6
1
.
8 5 8 5
C1 4 .7 u F 400V R8 10 1 /4 W 5% D2
1
2
LED W1 C5
2
L1 C om p os ta r4 5m H 0 STTH 10 2 0 R3
Vdd 4
Y cap 4 .7 n F
U4
8 7 6 5 D rain D rain D rain D rain
R4 100 5% 1 /4 W
4 1
6 .2 k 5% 1 /4 W
Fb + 3
U3 H11A817A
3 2
Sourc e Sourc e
1
R 9 1 /2 W 2 .2 K
2
2
1 2
2
C4 22uF 50V
R15 24k 1/4W C6 0 .3 3 u F 50V 0
1 2 3 4
Out 1 Ve1Vref Gnd
Vc c
8
1
VIPer12A constant current (1.05A) LED driver schematic
.
C2 10uF 400V VIPer1 2A R16 2.2 k 1/4W
C7 220uF 25V
R6 0 .1 6 7 1/2W
R 11 1K C8 0 .1 u F U2
Out 2 Ve2Ve2+ 7 6 5
R1 0 1K 1/4W
TS M1 0 3 R7 10K
Current selectable reference board
R5 750
25/45
Current selectable reference board
AN1916
Table 17.
Bill of materials
Part Description 4.7uF 400V Electrolytic 10uF 400V Electrolytic 47pF 1kV Ceramic Mfg P/N TKR2GM4R7D TKR2GM100D ECC-D3A470JGE Mfg Compostar Compostar Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Micro Commercial Radial Radial Radial Geometry Radial Radial Mounting TH TH TH TH TH TH TH TH TH TH
Qty Reference 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 C1 C2 C3 C4 C5 C6 C7 C8 C11 D1 D2 D3 F1 J1, J2 L1 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10, R11 R15 R16 T1 U2
22uF 50V Electrolytic EEU-FC1H220 4.7nF 250V Ceramic 0.33uF 50V Ceramic 220uF 50V Electrolytic 0.1uF 50V Ceramic 0.047uF 250V boxcap DipBridge 600V 1A STTH102 Diode STTH152 Diode Fuse TR5 0.5A Phoenix 2 PIN Connector ECK-DNA472ME ECU-S1H334KBB EEU-FH1E221 ECU-S1H104BB ECQ-U2A473MG DB105 STTH102 STTH152 3720500041 MKDSN1.5/2
STMicroelectronics Axial DO-41 TH STMicroelectronics Axial DO-41 TH Wickman Phoenix Contact Radial TH TH TH Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial TH TH TH TH TH TH TH TH TH TH TH TH TH SMD
45mH common mode FUU10S-V24503-Q22650 Compostar choke 6.8 5% 1/4W 100 5% 0.5W 6.2k 5% 0.25W 100 5% 0.25W 750 5% 0.25W 0.167 5% 0.5W 10k 5% 0.25W 10 5% 0.25W 2.2k 5% 0.5W 1k 5% 0.25W 24k 5% 0.25W 2.2k 5% 0.25W Cramer Transformer CVP11-047 Cramer Coil STMicroelectronics SO8 Carbon Composition
Dual OpAmp&Voltage TSM103ID Ref.
26/45
AN1916
Table 17.
1 1 1 U3 U4 VIPer12A Optocoupler Qty Reference W1
Bill of materials
F1
R1
Part Description
FU S E
5Ohms
4
22 Ga Solid Bus Wire
6 .8 5% 1W
J1
1 10 10 1
1
C ra m e r CVP11-046
1
2 1
C11 0 .0 4 7 u F X cap D3 S TTH 1 5 2
+
1
2
1.05A LED+ J2
1 2
38T
2 2
3
2
D4 PKC-136
+
+
4 1
3
D1 600V,1A DF06MGI R2
2
.
C3 47pF 1kV 100 5% 1 /2 W 56T
6 6
1
VIPer12A DIP
C1 10uF 400V
8 5 8 5
Mfg P/N
R8 51 1 /4 W 5% D2
1
2
LEDW1 C5
2
H11A817A/LTV817A
L1 C om pos tar4 5m H 0 STTH 102 Y cap 4 .7 n F 0 R3
Vdd
4
U4
4
1
8 7 6 5 D rain D rain D rain D rain
R4 100 5% 1 /4 W U3 H11A817A
3 2
6 .2 k 5% 1 /4 W
Fb + 3
Sourc e Sourc e
1
R9 2 .2 K R15 24 k C6 0 .3 3 u F 50V
1 2 3 4
2
2
1 2
2
C4 22uF 50V
Mfg
Out 1 Ve1Vref
Vc c Out 2 Ve2-
8 7 6
1
Figure 10. VIPer22A constant current (1.05A) LED driver schematic
.
C2 10uF 400V 180T C7 220uF 50V R6 0 .1 6 7 1/2W VIPer22A U2 1 /2 W 0 R16 2.2 k
Gnd Ve2+ 5
R11 1K C8 0 .1 u F
Fairchild/LiteOn
R10 1K 1 /4 W
TS M1 0 3 R7 10K
STMicroelectronics 8 Pin DIP
4 Pin DIP
Geometry
R5 750
TH TH
Current selectable reference board
TH
Mounting
27/45
Current selectable reference board Table 18. Bill of materials
Part Description 10uF 400V Electrolytic 47pF 1Kv Ceramic 22uF 50V Electrolytic 4.7nF 250V Ceramic 0.33uF 50V Ceramic 220uF 50V Electrolytic 0.1uF 50V Ceramic Mfg P/N TKR2GM100D ECC-D3A470JGE EEU-FC1H220 ECK-DNA472ME ECU-S1H334KBB EEU-FC1H221 ECU-S1H104BB Mfg Compostar Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Micro Commercial STMicroelectronics Axial DO-41 STMicroelectronics Axial DO-41 STMicroelectronics Axial DO-15 Wickman Phoenix Contact Compostar Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial Axial CVP11-046 TSM103ID H11A817A/LTV817A VIPer22ADIP Cramer Coil STMicroelectronics SO8 Fairchild/LiteOn 4 Pin DIP Radial Radial Radial Geometry Radial
AN1916
Qty Reference 2 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 C1, C2 C3 C4 C5 C6 C7 C8 C11 D1 D2 D3 D4 F1 J1, J2 L1 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10, R11 R15 R16 T1 U2 U3 U4 W1
Mounting TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH TH SMD TH TH TH
0.047uF 250V boxcap ECQ-U2A473MG DipBridge 600V 1A STTH102 diode STTH152 diode Peak Clamp Fuse TR5 0.5A Phoenix 2 Pin Conn 45mH common mode choke 5 5% 1W 100 5% 0.5W 6.2k 5% 0.25W 100 5% 0.25W 750 5% 0.25W 0.167 5% 0.5W 10k 5% 0.25W 51 5% 0.25W 2.2k 5% 0.5W 1K 5% 0.25W 24k 5% 0.25W 2.2k 5% 0.25W Cramer Transformer Dual OpAmp & Voltage Ref. Optocoupler VIPer22A 22 Ga solid bus wire DB105 STTH102 STTH152 PKC136 3720500041 MKDSN1.5/2 FUU10S-V24503Q22650 Wirewound
STMicroelectronics 8 Pin DIP Axial
28/45
AN1916
PCB layout
7
PCB layout
Figure 11. Board top side (not in scale)
Figure 12. Board bottom side viewed from top side (not in scale)
29/45
General circuit description
AN1916
8
General circuit description
The design operates from 90 to 264Vac input. The AC input is rectified and filtered by the bridge BR1 to generate the high voltage DC bus that is applied to the primary winding of the transformer, CVP11-04X. C1, L1, C2, and C11 provide EMI filtering for the circuit. A snubber circuit that consists of R2 and C3 reduces the leakage spike and voltage ringing on the drain pin of VIPerX2A, thereby provides additional EMI filtering. A transil, PKC-136, is used to clamp the drain voltage at a safe level for the VIPer22A constant current LED driver configuration because of the extra power level. The current is controlled by monitoring the voltage drop across the sense resistor, R6. The non-inverting input of the operational amplifier inside TSM103 is set to 175mV through the resistors divider, R5 and R7. This operational amplifier will then regulate the inverting input to 175mV by adjusting its output by changing the current going through the optocoupler, H11A817A (U3). The gain of the transistor inside the optocoupler then controls the feedback loop of VIPerX2A. The LED drive current is given by the equation: Iout=0.175V/R6 C6, C8, and R11 are utilized to ensure the stability of the circuit. C7 reduces the ripple current. As a safety measure, a resistor divider consisting of R15 and R16 is added to clamp the output voltage fed back into TSM103 so that it does not exceed the maximum voltage rating of U2, TSM103 for a no load condition at the output.
30/45
AN1916
Waveforms
9
Waveforms
Figure 13. shows VDD, Vout, and VDS at 375Vdc with one LED at the output for the VIPer12A constant current LED driver configuration while Figure 14. shows likewise with four LEDs at the output.
Figure 13. VIPer12A with 1 LED at output
Figure 14. VIPer12A with 4 LEDs at output
The drain to source voltage, VDD, and Vout waveforms are shown in Figure 15. and Figure 16., taken at 375Vdc for two and eight LEDs at the output respectively. It can be seen at worse case condition, the voltages across the device are not exceeded. Figure 15. VIPer22A with 2 LEDs at output Figure 16. VIPer22A with 8 LEDs at output
31/45
EMI results
AN1916
10
EMI results
Both VIPer12A and VIPer22A constant current LED driver configurations were designed to pass EN55022 Class B EMI at 120Vac input. Peak EMI is met with a comfortable margin.
Figure 17. VIPer12A EMI
Figure 18. VIPer22A EMI
32/45
AN1916
Current regulation
11
Current regulation
The VIPer12A and the VIPer22A have excellent regulation as shown in Figure 19. and Figure 20. Figure 19. VIPer12A current regulation
1 to 4 LE s V O tpu c rre t D Su tu n
40 0 30 9 30 8 30 7 30 6 30 5 30 4 30 3 30 2 30 1 30 0 1 2 LD Es 3 4
Figure 20. VIPer22A current regulation
2 to 8 L D V O tpu cu ren Es S u t r t
36 0 O tp t c rre t uuu n 35 0 34 0 33 0 32 0 31 0 30 0 2 3 4 5 LD Es 6 7 8
O tp t c rre t uu u n
33/45
Ripple current
AN1916
12
Ripple current
The ripple current measured at 90Vac with one LED at the output is 59mVpp and it is 57mVpp at 264Vac input for the VIPer12A constant current LED driver configuration. With four LEDs at the output the measured ripple current is 46mVpp at 264Vac input. Figure 22. shows the ripple current measurements for the VIPer22A constant current LED driver configuration. Here, the measured ripple is 26mVpp at 264Vac input with 2 LEDs at the output while the ripple is 19.5mVpp for 8 LEDs at the output.
Figure 21. Ripple at 264Vac (VIPer12A)
Figure 22. Ripple at 264Vac (VIPer22A)
34/45
AN1916
1.8" Round LED board configuration
13
1.8" Round LED board configuration
Another version is available of the rectangular VIPer12A LED driver and VIPer22A LED driver boards that fits inside a round 1.8" in diameter light fixture. The following sections will describe the layout and performance of this board.
35/45
Round LED board layout
AN1916
14
Round LED board layout
Figure 24. Bottom Side of Board (not in scale)
Figure 23. Top Side of Board (not in scale)
Figure 25. Top board layout
Figure 26. Bottom board layout
36/45
AN1916
EMI result
15
EMI result
The VIPer22A LED driver round board passes EN55022 Class B EMI at 120Vac input as shown in Figure 27. below. Figure 28. shows the EMI results at 120Vac input for VIPer12A round LED driver board.
Figure 27. VIPer22A round LED EMI
Figure 28. VIPer12A round LED EMI
37/45
Current regulation
AN1916
16
Current regulation
The current regulation measured is 0.15% at 120Vac input with 2 to 8 LEDs at the output for the VIPer22A round LED driver board. Figure 29. VIPer22A round LED board current regulation
C r e t R g laio ur n e u t n
04 . 03 .8 03 .6 03 .4 03 .2 03 . 02 .8 02 .6 02 .4 1 3 5 #o L D f Es 7 9
Io t ( ) uA
Iu ot
Figure 30. VIPer12A round LED board current regulation
C r e t R g la io ur n e u t n
03 .8 03 .7 03 .6 03 .5 03 .4 03 .3 03 .2 03 .1 03 . 0 1 2 3 4 5 Nme o L D u br f Es
Io t ( ) uA
Io t u
38/45
AN1916
Ripple current
17
Ripple current
Figure 31. below shows the ripple current measured with 2 LEDs and 8 LEDs at the output for 264Vac input for the VIPer22A round LED driver board. With 2 LEDs at the output, the measured ripple current is 51mApp while the ripple is 43mApp for 8 LEDs at the output. With 1 LED at the output for the VIPer12A round LED driver board, the measured ripple current is 65mApp and 45mApp for 4 LEDs at the output.
Figure 31. Ripple Current at 264Vac input (VIPer22A)
Figure 32. Ripple Current at 264Vac input (VIPer12A)
39/45
Low cost option
AN1916
18
Low cost option
A lower cost alternative to the isolated VIPer12A power supply is to use the VIPer22A in a non-isolated Buck configuration as shown in Figure 33. The circuit uses fewer and less expensive parts for systems that do not require safety isolation. Figure 33. Non-isolated buck configuration schematic
D6 1N 400 5
DZ 10V 1N5 240 C7 0 .1 u 250V
C3 1uF 25V
D8 1 N4005 2 LED, R3=jumper 1 LED, R3= 1Ohms 2W C4 0 .4 7 25V L1 10V @ 320mA R2 10 2W W1 1 2
Drai n 4 D rai n V dd Drai n Drai n
U1 VIP e r 2 2 D1 1 N4007
S our c e 3 S ourc e Fb
R0 10 1 /2 W
F u s able res is t or
Cx .0 2 2 50V
L0 1m H R1 1K C1 4 .7 u F 4 00V
R3 10 2W
8 7 6 5
1 2
1m H C6 33u F 63V
90 TO 264 vAC
C2 4 .7 u F 400V
D5 S TTA1 0 6
D Z1 16V 1n524 6
0
C1, L0, and C2 form an EMI filter to meet emission standards. D6, C3 maintain voltage for Vdd. L1 and C6 form the output filter to average the DC output. The output is voltage regulated at 10V by the zener diode DZ1. R2 drops the voltage and sets the current to approximately 330mA. A different value resistor can be used to set the current to a value up to 370mA which is the limiting factor of L1, the output inductor. This unit will drive 2 LEDs or 1 LED by cutting one jumper before use. To drive 1 LED only, the jumper can be cut, placing a second resistor in series with the output to drop additional voltage. This is not as efficient as the previous design but simpler and less expensive. The output is set to 10V because that is the minimum output voltage that will drive the VIPer22A with these minimum parts. With the addition of an inductor, 2 of 1N4005 and a small capacitor, a lower voltage can be designed to increase the efficiency. Table 19. Bill of materials
Quantity 1 2 1 1 1 1 1 Cx C1, C2 C3 C4 C6 C7 DZ Reference Description 0.022uF/50V 1206SM 4.7uF/400V electrolytic 1uF/25V electrolytic 0.47uF/25V 1206SM 33uF/63V low ESR 0.1uF/630V poly 1N5240 (10V)
40/45
AN1916 Table 19. Bill of materials
Quantity 1 1 1 2 1 1 1 1 2 1 1 DZ1 D1 D5 D6, D8 L0 L1 R0 R1 R2, R3 U1 W1 Reference
Low cost option
Description 1N5246 (16V) 1N4007 STMicroelectronics STTA106 1N4005 1mH 160mA JW Miller 5300-37 1mH 400mA Compostar Q3277 10 1/2W fusable resistor 1k 1/4W 10 2W STMicroelectronics VIPer22A Jumper wire
41/45
PCB layout
AN1916
19
PCB layout
Below is a reference design of the VIPer22A-Buck LED driver above. The board measures 67mm x 26mm. Figure 34. VIPer22A buck board layout
42/45
AN1916
Conclusion
20
Conclusion
We have shown two isolated and one non-isolated off line power supplies to efficiently drive LEDs in series.
43/45
Revision history
AN1916
21
Revision history
Table 20.
Date 10-Sep-2004 18-Jan-2006 03-May-2006
Document revision history
Revision 1 2 3 Initial release Various changes - New template - Various changes - New template - Component list value modified - Schematic diagram modified Changes
10-Aug-2006
4
44/45
AN1916
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
2006 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
45/45
Document Number: 10313
(643 kb)
