This IC is a Class-AB amplifier, which is less efficient than modern Class-D designs. It will generate significant heat, especially at high volumes. If it gets too hot, check the following:
The module features a 22-pin single-in-line package (SIP). While some pins may not be used depending on the circuit configuration, the standard layout includes power inputs, signal inputs, speaker outputs, and feedback loops. Stk411-210e Datasheet
What specific (e.g., protect mode, distorted audio, hum) are you currently experiencing? This IC is a Class-AB amplifier, which is
Resistors and capacitors on the feedback pins control gain and ensure stability. Power Supply: ±VCCplus or minus cap V sub cap C cap C end-sub connects to the corresponding pins. Output: Directly drives speakers through output pins. This IC is a Class-AB amplifier