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The AP3128 is a peak-current control, multi-mode (QR+CCM) PWM controller optimized for high performance, low standby power and cost-effective offline flyback converters. At no load or light load, the IC will enter burst mode to minimize standby power consumption. The minimum switching frequency is set to avoid audible noise. When the load increases, the IC will enter QR mode with frequency foldback to improve system efficiency and EMI performance. The maximum switching frequency about 105kHz is set to clamp the QR frequency to reduce switching power loss. Furthermore, the frequency dithering function is built in to reduce EMI emission. Internal piecewise linear line compensation ensures constant output power limit over the entire universal line voltage range. Comprehensive protection features are included, such as brown-out protection, cycle-by-cycle current limit (OCP), VCC Overvoltage Protection (VOVP), Secondary-side Output OVP (SOVP) and UVP (SUVP), internal OTP, Overload Protection (OLP), and pins’ fault protection.
Quasi-Resonant (QR) Operation at High Line Voltage
Continuous Current Mode (CCM) Operation at Low Line Voltage