NEW PRODUCT AP3984 PRIMARY SIDE POWER SWITCHER FOR OFF-LINE SMPS Description The AP3984 is a power switcher for power supplies with better conversion efficiency, better voltage & current accuracy, and improved protection functions.
Typical applications include charger, adapter for ADSL, home appliance power supply and PC auxiliary power supplies.
The AP3984 with built in BJT, regulates the output voltage and current in the primary side by piece-wise pulse frequency modulation (p-PFM) and primary current peak amplitude modulation (AM) in discontinuous conduction mode (DCM).
The system operating frequency reduces linearly from heavy load to light load in each interval of the p-PFM, and opera...

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