AP3301
Description
Pin Assignments
The AP3301 is a peak-current control, Quasi-Resonant (QR) PWM controller which is optimized for high performance, low standby power and cost effective offline flyback converters.
At no load or light load, the IC will enter the burst mode to minimize standby power consumption. The minimum switching frequency (about 20k Hz) is set to avoid the audible noise. At medium load, the IC will enter valley lock QR mode with frequency foldback to improve system efficiency and EMI performance. The maximum switching frequency (about 120k Hz) is set to clamp the QR frequency to improve efficiency. At low line input & heavy load, when switching frequency decreases below 62KHz with output load increasing, the IC will enter CCM mode with fixed switching frequency of 62k Hz to optimize low line power conversion efficiency. Furthermore, the frequency dithering function is built in to reduce EMI emission.
Internal slope pensation allows more stable peak-current mode control...
