General Description

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.

Features

• 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

• 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

Applications

• Adapters/Chargers for Cell/Cordless Phones,

PDAs, MP3 and Other Portable Apparatus

• Standby and Auxiliary Power Supplies

• LED Dri