AN2134 Application note
TS4962M Using the mono class D demo board
Introduction
The mono class D demo board is designed for the TS4962M class D audio amplifier. The TS4962M device, in a flip-chip package, is mounted on an adapter board with DIP connectors (see Section 5: Flip-chip to DIP adapter on page 5) which is, in turn, mounted on the demo board. Figure 1 shows the schematic diagram of the demo board, including the flip-chip to DIP adapter. Figure 1. Schematic diagram of mono class D demo board
Vcc Cn1 + J1 Cn2 Vcc
GND Cn4 + J2
GND
4 Stdby 300k C2 Cn3 Positive Input Negative input 100nF 150k 100nF R2 C3 150k 5 InIn+ + R1
Internal Bias 150k Out+ 6 Output PWM H Bridge 150k Oscillator GND TS4962 Flip-Chip to DIP Adapter 3 2 GND 10 OutCn6 Positive Output Negative Output
-
1
Cn5 + J3
About the TS4962M
Low voltage class D differential audio power amplifier with standby mode Operating range from VCC=2.4V to 5.5V 2.3W output power @ VCC=5V, THD=1%, F=1kHz, with 4 load 1.4W output power @ VCC=5V, THD=1%, F=1kHz, with 8 load Ultra low power consumption in standby mode (10nA) 63dB PSRR @ 217Hz in grounded mode (Av=2V/V) Low pop & click Fast startup time 5ms Module gain set at 2V/V Thermal and short-circuit protection
February 2007
Rev 4
+
GND
1 2 3
C1 2.2uF/10V
Vcc 3 Vcc 8 U1
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Description of the demo board
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1
Description of the demo board
Figure 2 shows the top view of the demo board PCB, with the location of all connectors. Figure 2. Mono class D demo board - top view
A list of components mounted on the demo board is given in Table 1. Table 1.
Name C1 C2 C3 Cn1 Cn2 Cn3 Cn4 Cn5 Cn6 J1 to J3 R1 R2 U1
Mono class D demo board bill of materials
Quantity 1 1 1 1 1 1 1 1 1 4 1 1 1 Description 2.2F/10V, electrolytic capacitor 100nF/63V 100nF/63V 3 pins header 2.54mm pitch 2 pins header 2.54mm pitch 2 pins header 2.54mm pitch 2 pins header 2.54mm pitch 2 pins header 2.54mm pitch 3 pins header 2.54mm pitch Jumper, 2.54mm pitch 150k 1/4W 1% resistor , 150k 1/4W 1% resistor , TS4962M flip-chip to DIP adapter
Table 2 gives the list of the connectors on the demo board, with a description and configuration information for each one.
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Demo board connectors
2
Demo board connectors
Table 2. Demo board connectors
Description Input signal connector (active input signal positive and negative) Connectors to modify input configuration (from capacitor-coupled = no jumper to common mode feedback = short-circuit) Output signal connector (Vo+ and Vo-) Standby control connector (GND, Standby, VCC). Power connector (VCC and GND). Power supply voltage from 2.4V to 5.5V. Socket connector for flip-chip to DIP adapter
Connectors Cn4 Cn4 and Cn5 Cn6 Cn1 Cn2 U1
Caution:
When you apply the power supply through Cn2, do not invert the polarity because it would destroy the amplifier U1.
3
Demo board layout
Figure 3 and Figure 4 show the bottom and top layers of the demo board PCB.
Figure 3.
PCB bottom layer
Figure 4.
PCB top layer
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Configuring the demo board characteristics
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4.1
Configuring the demo board characteristics
Differential gain
The demo board is set up with the differential gain, AV, set to 2V/V. If necessary, the differential gain can be adapted by modifying the values of resistors R1 and R2, in accordance with the following relation:
300 k A v = ---------------- or A v = 3---------------00 k R1 R2
where R1=R2 in k .
4.2
Input configuration
On the demo board, the Cn4 and Cn5 jumpers allow you to change the input configuration. You can select either capacitor-coupled or common-mode feedback. In the capacitor-coupled configuration, the -3dB cut-off frequency in Hz is: 1 1 ------------------------------------ = -----------------------------------2 × R1 × C2 2 × R2 × C3 with R in Ohms, C in Farads and where C2=C3. More information about component calculations is available in the TS4962M datasheet.
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Flip-chip to DIP adapter
5
Flip-chip to DIP adapter
The TS4962M is available in a flip-chip package which, while offering the advantages of excellent thermal dissipation and maximum space-savings, is difficult to manipulate for test or evaluation purposes. For this reason, the TS4962M device is pre-mounted onto a flip-chip to DIP adapter, shown schematically in Figure 5. Figure 5. Schematic diagram of the flip-chip to DIP adapter
Pin3 pin8 R1 OR C1 100nF B1 Vcc 300k Pin4 C2 Stdby Internal Bias 150k Out+ C3 Output PWM H Bridge A3 OutPin10 Pin6 B2
Pin5 Pin1
C1 InIn+ A1
+
150k Oscillator
GND A2 B3 R2 OR Pin2 Pin9
TS4962
A component list for this adapter is given in Table 3 below. The top-view of the adapter is shown in Figure 6. Table 3. Flip-chip to DIP adapter bill of materials
Quantity 1 1 1 1 1 Description 100nF/10V, ceramic capacitor, 0603 1F/6.3V, Tantalus capacitor, 0805 0R resistor, 0603 0R resistor, 0603 TS4962MIJ
Designation C1 C2 R1 R2 U1
+
C2 1uF
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Revision history Figure 6. Adapter top view
Pin1 Pin10
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Pin5
C2
4962
Pin6
6
Revision history
Date 1-Mar-2005 1-Dec-2005 6-Feb-2007 27-Feb-2007 Revision 1 2 3 4 Initial release. Format updated. Updated document structure and format. Removed draft banner, added this revision history. Changes
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