PA8157 is a high fidelity, high efficiency, low EMI, filter-free, 5W single-channel D-class audio power amplifier. PA8157 internally integrates intelligent gain control (AGC) function, which adjusts the system gain intelligently by detecting the size of the output signal, avoids the damage of overload to the speaker, prevents the breakage of sound when the volume is too large, and improves the auditory experience. PA8157 adopts the system architecture of full differential filter-free PWM modulation, which has good anti-interference capability. Its internal integrated thermal protection, undervoltage protection, overcurrent protection, and “click” noise suppression modules provide PA8157 with stronger robustness and better adaptability. PA8157 uses a typical SOP_8 package.