GENERAL DESCRIPTION

The ACT511 is a high performance peak current mode PWM controller. ACT511 applies ActiveQRTM and frequency foldback technique to reduce EMI and improve efficiency. ACT511’s maximum switching frequency is set at 90kHz. Very low standby power, good dynamic response and accurate voltage regulation is achieved with an opto-coupler and the secondary side control circuit.

FEATURES

• Quasi-Resonant Operation

• Adjustable up to 75kHz Switching Frequency

• Accurate OCP/OLP Protection

• Integrated Patented Frequency Foldback

    Technique

• Integrated Patented Line and Primary

    Inductance Compensation

• Built-in Soft-Start Circuit

• Line Under-Voltage, Thermal, Output Overvoltage, Output Short Protections

• Current Sense Resistor Short Protection

• Transformer Short Winding Protection

• 100mW Standby Power

• Complies with Global Energy Efficiency and

    CEC Average Efficiency Standards

• Tiny SOT23-6 Packages

APPLICATIONS

• AC/DC Adaptors/Chargers for Cell Phones,

    Cordless Phone, PDAs, E-books

• Adaptors for Portable Media Player, DSCs,

    Set-top boxes, DVD players, records

• Linear Adapter Replacements