The device is a class AB Audio amplifier assembled in the Clipwatt19 package; it is designed for high quality sound application. The STA543SA is a 3-channels audio amplifier with DC volume control dedicated for each single channel. It is a device suitable for 2.1 solution thank to its output configuration with two single ended channels and one bridge. The Short Circuit Protection, the Thermal Protection and the Diagnostics Functions are integrated in the device.