Diodes Incorporated

AP3708N (Obsolete)

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The AP3708N is a high performance AC/DC power supply controller for battery charger and adapter applications. The device uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies. The AP3708N provides accurate constant voltage, constant current (CV/CC) regulation without requiring the opto-coupler and the secondary control circuitry. It also eliminates the need of loop compensation circuitry while maintaining stability. The AP3708N achieves excellent regulation and high power efficiency, the no-load power consumption is less than 150mW.


· Primary Side Control for Rectangular Constant Current and Constant Voltage Output · Eliminates Opto-Coupler and Secondary CV/CC Control Circuitry · Eliminates Control Loop Compensation Circuitry · Output Cable Resistor Compensation · Flyback Topology in DCM Operation · Random Frequency Modulation to Reduce System EMI · Valley Turn on of External Power NPN Transistor · Maximum Switching Frequency: 110kHz · Built-in Soft Start · Over Voltage Protection · Short Circuit Protection


· Adapters/Chargers for Cell/Cordless Phones, PDAs, MP3 and Other Portable Apparatus · Standby and Auxiliary Power Supplies

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