Texas Instruments TPA3100D2 User Manual
TPA3100D2 Audio Power Amplifier Evaluation Module
Contents
1 Introduction .......................................................................................... 2
2 Operation ............................................................................................ 3
3 TPA3100D2 EVM Schematic ..................................................................... 5
4 TPA3100D2 EVM PCB Layers ................................................................... 6
5 TPA3100D2 EVM Parts List ....................................................................... 8
List of Figures
1 TI TPA3100D2 Audio Power Amplifier EVM – Top View ...................................... 2
2 TI TPA3100D2 Audio Power Amplifier EVM – Bottom View .................................. 2
3 TPA3100D2 EVM Schematic ..................................................................... 5
4 TPA3100D2 EVM – Top Layer ................................................................... 6
5 TPA3100D2 EVM – Bottom Layer................................................................ 7
User's Guide
SLOU179 – December 2005
With LC Filter
List of Tables
1 Gain Settings ........................................................................................ 4
2 TPA3100D2 EVM Parts List ....................................................................... 8
SLOU179 – December 2005 TPA3100D2 Audio Power Amplifier Evaluation Module With LC Filter 1
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Introduction
1 Introduction
1.1 Description
The TPA3100D2 evaluation module consists of a single 20-W, class-D, stereo audio power amplifier
complete with a small number of external components mounted on a circuit board that can be used to
directly drive a speaker with an external analog audio source as the input.
Figure 1. TI TPA3100D2 Audio Power Amplifier EVM – Top View
Figure 2. TI TPA3100D2 Audio Power Amplifier EVM – Bottom View
2 TPA3100D2 Audio Power Amplifier Evaluation Module With LC Filter SLOU179 – December 2005
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1.2 TPA3100D2 EVM Specifications
Operation
V
CC
I
CC
P
O
R
L
Supply voltage range 10 V to 26 V
Supply current 4 A max
Continuous output power per channel, 8 Ω , V
Minimum load impedance 3.2 Ω
2 Operation
2.1 Quick Start List for Stand-Alone Operation
Follow these steps to use the TPA3100D2 EVM stand-alone or when connecting it into existing circuits or
equipment. Connections to the EVM module can be made using banana plugs for the power supply and
output connections. The inputs accept standard RCA plugs.
2.1.1 Power Supply
1. Ensure that all external power sources are set to OFF.
2. Connect an external regulated power supply adjusted from 10 V – 26 V to the module V
GND ( J8) banana jacks taking care to observe marked polarity.
2.1.2 Evaluation Module Preparations
2.1.2.1 Inputs and Outputs
1. If connecting to a fully differential input or a grounded input (the shield of the RCA jack is GND),
remove jumpers J9 and J10 from the EVM board. These are located next to the input jacks J1 and J2.
If connecting to a floating source, like a portable CD player, install J9 and J10. After setting the J9 and
J10 jumpers appropriately, connect the audio source to J1 (RIGHT) and J2 (LEFT).
2. Connect a speaker across ROUT+ ( J6) and ROUT- ( J5). Connect another speaker across LOUT+ ( J3)
and LOUT- ( J4).
3. Install both gain jumpers GAIN0 ( J12) and GAIN1 ( J13). This sets the gain of the amplifier to the
lowest level, 20 dB.
4. Remove the jumper at MSTR/ SLV ( J14). If only one TPA3100D2 is evaluated, it must be configured as
the master. If multiple EVMs are connected together using the SYNC output (TP2), the additional
EVMs must be configured in the slave mode by installing the J14 jumper.
5. Remove the jumper ( J11). This places the device in a latched mode when a short-circuit event occurs.
= 18 V, THD + N = 3.5% 20 W
CC
( J7) and
CC
2.1.2.2 Control Inputs
1. SD: This terminal is active low. A low signal on the device terminal (< 0.8 V) shuts down the amplifier;
a high signal (> 2 V) on the device terminal places the amplifier in the active state. Holding down
switch S1 places the amplifier in the SHUTDOWN state. Releasing S1 returns the amplifier to the
active state.
2. MUTE: This terminal is active high. A high signal (> 2 V) on this terminal immediately terminates audio
playback through the speakers and the outputs stop switching; a low signal (< 0.8 V) enables the
device. S2 on the EVM controls the state of the MUTE terminal. Holding down switch S2 places the
amplifier in the MUTE state. Releasing S2 returns the amplifier to the active state.
3. GAIN0/GAIN1: Together, these terminals determine the gain of the amplifier. Refer to Table 1 .
Installing a jumper in J12 or J13 sets the respective terminal to GND. Removing the jumper sets the
respective terminals to VREG (~4 V). Removing jumpers INCREASES the gain while installing jumpers
DECREASES the gain. Logic levels are TTL compatible.
4. MSTR/ SLV: This terminal is used with the SYNC ( TP2) output to synchronize the switching
frequencies of multiple TPA3100D2 devices. For example, with 2 devices, one would be configured as
the MASTER by removing the J14 jumper. The other EVM would be configured as the SLAVE device
by installing a jumper in the J14 location. Logic levels are TTL compatible.
SLOU179 – December 2005 TPA3100D2 Audio Power Amplifier Evaluation Module With LC Filter 3
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Operation
2.1.2.3 Control Outputs
1. FAULT: This pin is a TTL compatible output for reporting a short-circuit fault on the output. If the
outputs are shorted to GND, V
of the following operations is performed: power is cycled, SHUTDOWN is cycled, or MUTE is cycled. If
jumper J11 is installed, the MUTE terminal is connected directly to the FAULT terminal and a
short-circuit fault is automatically cleared when it occurs.
2.1.3 Power Up
1. Verify correct voltage and input polarity and turn the external power supplies on. The EVM should
begin operation.
2. Adjust the input signal.
3. Adjust the control inputs to the desired settings.
4. If no sound is audible, check the position of the MSTR/ SLV ( J14) jumper. It should be removed if
evaluating a single EVM.
5. Adjust the amplifier gain by installing/removing the gain jumpers, J12 and J13.
GAIN1 (J13)
(1)
OFF = Jumper removed; ON = Jumper installed
(1)
ON ON 20
ON OFF 26
OFF ON 32
OFF OFF 36
Table 1. Gain Settings
GAIN0 (J12)
, or to each other, this terminal goes high and remains high until one
CC
(1)
Amplifier Gain (dB)
4 TPA3100D2 Audio Power Amplifier Evaluation Module With LC Filter SLOU179 – December 2005
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