2.3 Hardware Default Setup BTL (2.0)

BTL (2.0) default hardware setup is as follows:

• Remove the EVM from the ESD bag.
• Check that jumpers are in their default state as shown in Figure 1 and Table 3 for stereo BTL operation:

Table 3. Stereo BTL Default Jumper States

Jumper	Setting	Comment
J29	IN	PVDD to 15-V BUCK
J31	IN	12-V LDO to 12-V TERM
J32	IN	3.3-V LDO to 3.3-V TERM
J33	IN	3.3-V LDO to 3.3-V TERM
J21	IN	CSTART SE
J16	3 to 4	MASTER MODE
J5	2 to 3	M1 – BTL
J6	2 to 3	M2 – BTL
J22	IN	OUTA CAP SHUNT
J23	IN	OUTB CAP SHUNT
J24	IN	OUTC CAP SHUNT
J25	IN	OUTD CAP SHUNT
J26	2 to 3	INC SELECT
J27	2 to 3	IND SELECT
J7	OUT	PBTL SELECT INC
J8	OUT	PBTL SELECT IND
J10	OUT	INC/D DIFF INPUT
J12	OUT	INC/D DIFF INPUT
J4	1 to 2	INA/B SE INPUT
J19	1 to 2	INC/D SE INPUT

• Set S1 to the RESET position.
• Set power supply to 51 V (14–53.5-V range) and current to 10 A (5–14-A range). Do not power up until all connections are completed.
• Connect power supply to TPA3255 EVM positive terminal to PVDD (RED) and negative terminal to GND (BLACK).
• Connect left channel speaker/power resistor load (4–8 Ω) to TPA3255 EVM positive output terminal to OUTA (RED) and AP analog input channel A positive terminal.
• Connect left channel speaker/power resistor load (4–8 Ω) to TPA3255 EVM negative output terminal to OUTB (BLACK) and AP analog input channel A negative terminal.
• Connect right channel speaker/power resistor load (4–8 Ω) to TPA3255 EVM positive output terminal to OUTC (RED) and AP analog input channel B positive terminal.
• Connect right channel speaker/power resistor load (4–8 Ω) to TPA3255 EVM negative output terminal to OUTD (BLACK) and AP analog input channel B negative terminal.
• Be careful not to mix up PVDD, OUTA, and OUTB terminals, since the colors are the same (RED).
• For single-ended stereo inputs, connect AP channel A XLR to RCA male jacks to female RCA jacks input A/AB (RED) and AP channel B XLR to RCA male jacks to female RCA jacks input C/CD (WHITE) and set J4 and J19 jumper positions to SE.
• For differential stereo inputs, connect positive RCA male jacks to female RCA jacks input A/AB (RED) and input C/CD (WHITE) and connect negative RCA male jacks to female RCA jacks input B (BLUE) and input D (BLACK) and set J4 and J19 jumper positions to DIFF.
• Power up power supply once all the connections are made correctly and the 3.3-V and12-V LEDs (GREEN) will illuminate.
• Set S1 to the NORMAL position.
• CLIP_OTWz (ORANGE) and FAULTz (RED) LEDs should be off, if the audio source is off.

Using a smart phone, tablet, or PC with headphone to RCA cable, audio streaming via headphone jack can begin once the EVM is powered up correctly with jumpers in their default state. Start the media player of your choice and enjoy the enhanced audio performance TPA3255 provides as a quick check of the setup.