Taiwan Class D Audio Power Amplifier IC

The tmpa2155ds is a stereo class-d filter-free audio power amplifier ic. With btl(bridge-tied-load) configuration, it delivers up to 2.7w/ch(5.4w in all) into a 3 ohm load or 2.3w/ch(4.6w in all) into a 4 ohm load or 1.5w/ch(3w in all) 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).