Primary Side Regulated Switching Mode Power Supply Controller
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The AP3781 is a high performance AC/DC power supply controller for battery charger and adapter applications. The controller regulates the output voltage and current in the primary side by Pulse Frequency Modulation in Discontinuous Conduction Mode (DCM).
The AP3781 operates in Pulse Frequency Modulation (PFM) mode and peak current Amplitude Modulation (AM) mode to form a fine tune frequency curve within the whole power range. Therefore, AP3781 can achieve high average efficiency and improve audible noise.
The AP3781 provides comprehensive protections without additional circuitry. It contains VCC over voltage protection, output over voltage protection, output under voltage protection, output short circuit protection, cycle-by-cycle current limit, open loop protection, external OTP and internal OTP, etc.
The AP3781 is packaged in SO-8.
|StandbyPower (Max) (mW)||75|
|Power Rating (W)||45|