Diodes Incorporated AP3781 AC/DC Power Supply Controller

Diodes Incorporated AP3781 AC/DC Power Supply Controller is a high-performance AC/DC power supply controller. It is ideal for battery charger and adapter applications, and regulates the output voltage and current in the primary side. The AP3781 features Pulse Frequency Modulation in Discontinuous Conduction Mode (DCM). It 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. The AP3781 achieves high average efficiency and improves audible noise.

Features

Primary side control for eliminating optocoupler
75mW no-load input power
Flyback topology in DCM operation
External adjustable overtemperature protection
Fixed internal cable compensation: 3%
External cable compensation: 3% to 8%

Multiple segment AM/PFM control mode to improve audio noise and efficiency
Ultra-low undervoltage protection, supports wide operating voltage for power tool motor drive
Totally lead free and fully RoHS compliant
Halogen- and antimony-free “green” device

Applications

Routers
Power tools
Set-top box (STB) power supplies

Smart speakers
Network adaptors

Diodes Incorporated AP3781 AC/DC Power Supply Controller

Features

Applications

Typical Application Circuit

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