Diodes Incorporated

AP3703 (Obsolete)

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The AP3703 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 AP3703 provides accurate constant voltage, constant current (CV/CC) regulation while removing the opto-coupler and secondary control circuitry. It also eliminates the need of loop compensation circuitry while maintaining stability. The AP3703 achieves excellent regulation and high average efficiency, yet meets the requirement for no-load consumption less than 100mW.


· Primary Side Control for Rectangular Constant Current and Constant Voltage Output · Secondary CV/CC Control Circuitry Eliminating Opto-Coupler · No Need for Control Loop Compensation Circuitry · Flyback Topology in DCM Operation · Random Frequency Modulation to Reduce System EMI · Maximum Switching Frequency: 60kHz · Built-in Soft Start · Open Feedback Protection · Over Voltage Protection · Short Circuit Protection · Small SOT-23-5 package to achieve compact size and less component


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

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