Description
1-3
Introduction

1.2 Description

The TPA311 MSOP audio power amplifier evaluation module is a complete,
low-power single-channel audio power amplifier. It consists of the TI TPA311
350-mW low-voltage audio power amplifier IC in a very small MSOP package,
along with a small number of other parts mounted on a circuit board that is
approximately one and a quarter inches square (Figure 1–1).

Figure 1–1. The TI TPA311 Audio Amplifier Evaluation Module

OUT+
IN+
GND
Vdd GND
U1 †
R2
Shutdown
R3
OUT–
GND
C5
TEXAS
INSTRUMENTS
SLOP123
TPA311 MSOP EVM
C4
C1
C2
R4
SE\BTL*
C3
S1
R1
+
†Due to the very small size of the MSOP IC package, the standard part number TPA311 is replaced with the code TIAAB
Single in-line header pins are mounted to the underside of the module circuit
board to allow the EVM to be plugged into the TI plug-n-play audio amplifier
evaluation platform, or to be wired directly into existing circuits and equipment
when used stand-alone.
The platform has room for a pair of TP A311 MSOP evaluation modules and is
a convenient vehicle for demonstrating TI’s audio power amplifier and related
evaluation modules. The EVMs simply plug into the platform, which auto-
matically provides power to the modules, interconnects them correctly, and
connects them to a versatile array of standard audio input and output jacks and
connectors. Easy-to-use configuration controls allow the platform and EVMs
to quickly model many possible end-equipment configurations.
There is nothing to build, nothing to solder, and nothing but the speakers
included with the platform to “hook up.”

1.3 TPA311 EVM Specifications

Supply voltage range, VDD 2.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply current, IDD 250 mA, max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output power, PO:8-Ω BTL, VDD=5 V : 350 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32-Ω BTL, VDD=5 V: 75 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio input voltage, VI 2 Vpp, max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum load impedance, RL 8 Ω. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .