Preliminary

TMPA2155DM

Rev.1.0

December 24, 2007

Copyright ©2005, Tai-1 Microelectronics Corp.

1

2.7-W MONO CLASS-D AUDIO POWER AMPLIFIER

GENERAL DESCRIPTION

The TMPA2155DM is a mono class-D audio power amplifier IC.

With BTL(Bridge-Tied-Load) configuration, it delivers up to

2.7W power into a 3 ohms load or 2.3W power into a 4 ohm load

or 1.5W power into an 8 ohm load. No external heat-sink is

required.

For multiple-input applications, independent gain control and

corner frequency can be implemented by summing the input

sources through resistor ratio and input capacitor values.

Automatic voltage gain control makes the best use of battery.

Analog input signal is converted into digital output which drives

directly to the speaker. High power efficiency is achieved due to

digital output at the load. The audio information is embedded in

PWM（Pulse Width Modulation）.

APPLICATIONS

Multimedia

application

includes

Cellular

Phones,

PDAs,

DVD/CD players, TFT LCD TVs/Monitors, 2.1 channel/5.1

channel audio systems, USB audio. It is also ideal for other

portable devices like Wireless Radios.

FEATURES

♦ 2.5V to 6V Single Supply

♦ Up to 2.7W at 5V, 3 ohms

♦ Up to 85% Power Efficiency

♦ Automatic output power control (APC)

♦ 2.2mA Quiescent Current at 5V

♦ Less Than 0.2uA Shutdown Current

♦ Pop-less Power-Up, Shutdown and Recovery

♦ Differential 250 KHz PWM Allows BTL to Doubles

Output Power and Eliminates LC Output Filter

♦ Compatible with earphone application

♦ Thermal Shutoff and Automatic Recovery

♦ Short-Circuit Protection

♦ Differential Signal Processing Improves CMRR

Package

TSSOP8, SOP8 Available

, pb free【RoHS】

For best performance, please refer to

http://www.taimec.com.tw/English/EVM.htm

http://www.class-d.com.tw/English/EVM.htm

for PCB layout.

REFERENCE CIRCUIT