Operation
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Power Supply
A single power supply is required to power up the EVM. Most of the pins are PVCC compliant. The PVCC
supply can also be used to power the analog supply (AV
CC
) and can be used to pull up the logic pins for
shutdown (SD) control, fault detection (FAULT), and gain (GAIN0 and GAIN1) as long as the voltage slew
rate is limited to 10 V/ms. GVDD is an internally generated supply for the output FETs and also can be
used to power the PLIMIT circuit. PLIMIT is GVDD compliant, but not PVCC compliant. PLIMIT also can
be powered by an external supply connected to the PLIMIT pin. Take care not to power the PLIMIT pin (or
connect power to the GVDD pin inadvertently through the PLIMIT network) when the PVCC supply is
turned off. This can cause damage to the integrated circuit (IC).
Table 2. Power Supply Requirements
Description
Voltage Range
Current Requirements
Minimum Wire Size
PVCC
8 to 26 V
3 A
24 AWG
1. Ensure that the external power source is set to OFF.
2. Connect the external regulated power supply adjusted from 8 V to 26 V to the module PVCC and GND
banana jacks, taking care to observe marked polarity.
Evaluation Module Preparations
Inputs and Outputs
1. For a BTL configuration, connect a load across the outputs (OUT+ and OUT-).
2. Connect the audio input, either differential or single-ended, to the IN RCA phono plugs for BTL
operation.
Control Inputs
1. Ensure that the mode jumpers, JP1, JP2, GAIN0, and GAIN1, are set correctly depending on the
desired operating state (
Power Up
1. Verify correct voltage and input polarity, and turn the external power supplies ON.
The EVM begins operation.
2. Adjust the audio source for the desired volume.
Table 3. TPA3111D1 Control Guide
Control
Function
Options
Notes
JP1
Allows amplifier to self-reset after
Insert jumper for self-reset.
For latched SC fault, cycle power to reset the fault
short-circuit protection event
Leave off for latched SC
latch. DC Detect does not recover with SDZ cycle.
fault.
PVCC must be cycled to reset DC Detect.
GAIN1/GAIN0
Controls amplifier gain
Insert jumper for zero state
00 = 20 dB (GAIN1, GAIN0)
(low). Leave off for one state
01 = 26 dB
(high).
10 = 32 dB
11 = 36 dB
JP2
Defeats PLIMIT function and allows
Insert jumper for PLIMIT
JP2 connects PLIMIT directly to GVDD.
amplifier to run at full power.
defeat.
R7
Adjust PLIMIT (an external voltage
Remove JP2 to allow PLIMIT The output voltage rails are limited to
also can be applied to the PLIMIT test
operation.
approximately 4X the voltage at the PLIMIT pin.
point)
Take care not to apply power to PLIMIT when the
PVCC source is off.
JP3, JP4
Connects LC filters to outputs.
4
TPA3111D1EVM Audio Amplifier Evaluation Board
SLOU270A – September 2009 – Revised July 2010
Copyright © 2009–2010, Texas Instruments Incorporated
