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The AP3304 is a Peak-Current control, Multi-Mode CCM+ QR PWM controller which is optimized for high performance, low standby power and cost effective offline flyback converters. At light load, the AP3304 operates in burst mode with 23kHz switching frequency to minimize standby power consumption and avoid the audible noise. When the load increases, the AP3304 will enter QR mode with frequency fold-back to improve system efficiency and EMI performance. In QR mode, the maximum switching frequency is clamp to 100kHz to reduce switching power loss. If the switching frequency reaches upper limit of the AP3304, the switching frequency starts to fall as the load increase until entering CCM with fixed switching frequency 80kHz to optimize power conversion efficiency. Furthermore, the frequency dithering function is built in to reduce EMI emission. Internal piecewise linear line compensation ensures constant output power limit over entire universal line voltage range. Comprehensive protection features are included, such as brown out protection, cycle-by-cycle current limit (OCP), VCC Over Voltage Protection (VOVP), Secondary-side Output OVP (SOVP) and UVP (SUVP), internal OTP, Over Load Protection (OLP) and pins’ fault protection.