Texas Instruments TAS5755MEVM, User Manual

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Installation
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6 SLOU481A – August 2017 – Revised October 2017
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Copyright © 2017, Texas Instruments Incorporated
TAS5755MEVM Evaluation Module
2.1.2 PSU Interface
The TAS5755MEVM is powered by two power supplies: a 5-V power supply (V
IN
) connected to the
MC57xx controller board, and the PVDD power supply connected directly to the EVM board. The 3.3-V
level is generated on the controller board by a voltage regulator from the 5-V supply.
NOTE: The power-supply cable length must be minimized. Increasing the length of the PSU cable
increases the distortion of the amplifier at high output levels and low frequencies.
The maximum output-stage supply voltage depends on the speaker load resistance. Check the
recommended maximum supply voltage in the TAS5755 data sheet (
SLOS982 ).
2.1.3 Loudspeaker Connectors
CAUTION
All speaker outputs are biased at V
CC
/ 2 and must not be connected to ground
(for example, through an oscilloscope ground).
Loudspeaker connections vary by device setup and the evaluation module features a dedicated connector
for each configuration. When using SE or BTL mode, ensure that the jumper J9 is populated indicating
that BTL rather than PBTL mode is enabled. When connecting a speaker in SE mode, connect the
TAS5755MEVM speaker to one of the two SE connectors labeled SE A (J2) and SE B (J4). When
connecting a speaker in BTL mode, connect the speaker to one of the two BLT connectors labeled BTL
AB (J3) and BTL CD (J6). Note that the EVM is set up to use only channels A and B in the SE mode, for a
production application; however, any of the four channels (A, B, C, D) can be setup for SE mode
operation. To use PBTL mode, depopulate the jumper on the header labeled J9 and populate jumpers J10
and J11 with a high-current wire or jumper. The speaker can then be connected to the connector labeled
PBTL (J5).
Speakers or loads can be connected to the outputs A-D with clip leads, or cables can be made
with female connectors (JST VHR-2N) that can mate to male connectors on the EVM board.
Figure 6. BTL Connection
Figure 7. SE Connection