AP3303
Description
The AP3303 is a peak-current control, Quasi-Resonant (QR) PWM controller which is specially designed for offline power supply that requires ultra-low standby power, high-power density and prehensive protection. It can coordinate with secondary side USBPD or quick charger controller which can provide a flyback charger solution.
At no load or light load, the IC will enter the burst mode to minimize standby power consumption. The minimum switching frequency (typical: 24k Hz) is set to avoid the 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 (typical: 120k Hz) is set to clamp the QR frequency to reduce switching power loss. Furthermore, the frequency dithering function is built in to reduce EMI emission.
The AP3303 provides an inner high-voltage start-up function through HV pin which can reduce the standby loss. Moreover, The AP3303 integrates a VCC LDO...
