STEVAL-ILL001V1
Dimmable driver for HB power LEDs with VIPER22A-E (DALI connector)
Data Brief
Features
Selectable input voltage range: 85 VAC - 135 VAC or 185 VAC 265 VAC Nominal output voltage range: 3.5 V - 28 V Maximum output voltage at open load: 32 V Output current: 350 mA Dimming range: 0 - 90% EMI standard: EN55015:2000 STEVAL-ILL001V1
Description
The STEVAL-ILL001V1 evaluation board introduces an innovative solution for driving high brightness 1 W LEDs (light emitting diodes), using the VIPer22A-E in a flyback configuration with output current control. The power supply is capable of driving a 1 to 8 LED array in the European voltage range of 185-265 VAC without modifications. The same VIPer device can also function within the specifications in the U.S. input voltage range by using an input voltage doubler. An innovative control technique is used to adjust the duty cycle of the output current, in order to dim the luminosity of the LEDs down to 10% of the maximum value (STMicroelectronics patent pending). The proposed driver is suitable for applications such as landscape lighting, street lighting, car parks, bollards, garden lighting, large area displays, etc. Domestic applications such as room lighting, decorative fixtures and architectural lighting can also benefit from a dimmable light source.
October 2007
Rev 1
1/4
www.st.com 4
For further information contact your local STMicroelectronics sales office.
STEVAL-ILL001V1
C14
D7
L1
R8 C4 R2 R3 + C9 R4 R5 D5 D1 D3 Q3 R10 IN CM C2 +Vcc +Vcc C1 OPT Q2 IN
VDD DRAIN
LD1
OUT + C10 R9
LD2
DZ2
LD8
Fs
+
D6
D8 C7 Q1 + C5
R7 R22 D9 + C8 DZ1
Vref
D10
R12 R11 R23 CONTROL C11
R24
FB J3 C6
C12
R13
SOURCE
+ C3
IC1 D2 D4 9 4 7 R6 2 + Vref 8
6
5 12
11
10
R14
-
3
+
-
IC2 1 R18 13 2 +Vcc R16 R19 3 +
-
4
+
1
15
14
16
Board schematic
R15
J1
R20 R17
Schematic
D11
+Vcc
C13
R21
R25
R26
CN1
J2
Board schematic
Figure 1.
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STEVAL-ILL001V1
Revision history
2
Revision history
Table 1.
Date 30-Oct-2007
Document revision history
Revision 1 Initial release Changes
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STEVAL-ILL001V1
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