SLOU441 July   2016 TPA3255

 

  1.   TPA3255EVM
    1.     Trademarks
    2. 1 Hardware Overview
      1. 1.1 TPA3255EVM Features
      2. 1.2 TPA3255EVM Frequency Adjust
      3. 1.3 TPA3255EVM Single-Ended and Differential Input
      4. 1.4 TPA3255EVM Clip Overtemperature and Fault Indicators
    3. 2 TPA3255EVM Setup
      1. 2.1 TPA3255EVM Setup
      2. 2.2 Hardware Requirements
      3. 2.3 Hardware Default Setup BTL (2.0)
    4. 3 Using TPA3255EVM in Different Output Configurations
      1. 3.1 BTL Plus Two SE (2.1) Operation
      2. 3.2 PBTL (0.1) Output Operation
      3. 3.3 Single-Ended (SE) Output (4.0) Operation
    5. 4 Board Layouts, Bill of Materials, and Schematic
      1. 4.1 TPA3255EVM Board Layouts
      2. 4.2 TPA3255EVM Board Dimension
      3. 4.3 Bill of Materials
      4. 4.4 TPA3255EVM Schematics

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.

NOTE

J3/J10 and J18/J15 can be used for differential inputs to INA/INB and INC/IND, respectively.

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.