Circuit diagram of 70W stereo power amplifier based on ICSTA550

Here is the circuit diagram of a 70W stereo power amplifier built using single power supply ICSTA550. The circuit is simple and requires few additional electronic components to support the working of ICSTA550.

This power stereo amplifier uses a bipolar/symmetrical power supply. Since the negative supply range is only -22V maximum according to the datasheet, you can use a +/-20V to +/-22V supply. Don't forget to install a heat sink on the power ICSTA550 to prevent overheating. ? With the characteristics possessed by this IC, the audio output produced will not disappoint.

About STA550:

The STA550 is a fully integrated power module designed to implement BASH? amplifiers when used in conjunction with the STABP01 digital processor.

feature:

A single chip bridge stereo amplifier for bash? Architecture

55+55w output power @rl=4/8, thd=0.5%

70+70w output power @rl=4/8, thd=10%

High dynamic preamplifier input stage

Externally programmable feedback compressor

AC coupled input to class AB bridge output amplifier

Precision rectifiers for driving digital converters

On/off sequence/timer with mute and standby functions

Proportional overpower output current to limit digital converter

Absolute power bridge output transistor power protection

Absolute output current limit

Integrated thermal protection)

Power overvoltage protection

Flexiwatt power pack with 27 pins