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The AP3306 is a highly integrated Active Clamp Flyback (ACF) controller optimally designed for offline power supplies to meet ultra-low standby power, high power density, and comprehensive protection requirements. The controller realizes non-complimentary high-low-side control mechanisms to achieve Leakage Energy Recycling and Zero Voltage Switching (ZVS) for supreme-efficiency performance. The AP3306 provides a high-voltage start-up function through the HV pin, reducing standby loss. Moreover, the AP3306 integrates a VCCL LDO circuit, allowing the LDO to regulate the wide range VCCL to an acceptable value. This makes the AP3306 an ideal candidate for wide-range output-voltage applications, such as USB-PD. The built-in frequency dithering function greatly eases EMI design as well. At no load or light load, the IC will enter burst mode to minimize standby power consumption. The minimum switching frequency (about 22kHz) is set to avoid audible noise. When the load increases, the IC will enter ACF mode with frequency foldback to improve system efficiency and EMI performance. The maximum switching frequency (about 130kHz or 200kHz optional) is set to clamp the switching frequency to reduce switching power loss. Comprehensive protection features are included, such as Brown-Out Protection (BNO), Cycle-by-Cycle Overcurrent Protection (OCP), VCC Overvoltage Protection (VOVP), Secondary-Side Output OVP (SOVP) and UVP (SUVP), internal Overtemperature Protection (OTP), Overload Protection (OLP), and Pin Fault Protection.
Active Clamp Flyback Topology with Recycled Leakage Energy and Pseudo Zero Voltage Switching Functions
Embedded VCC LDO for VCCL Pin to Guarantee Wide Range Output Voltage