ACT511

ACT511 Product Brief, 18-Feb-14 ActiveQRTM Quasi-Resonant PWM Controller 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 Over- voltage, Output Short Protections Current Sense Resistor Short Protection Transformer Winding Short Protection 100mW Standby Power Complies with Global Energy Efficiency and CEC Average Efficiency Standards Tiny SOT23-6 Packages good margin. ACT511 integrates comprehensive protection. In case of over temperature, over voltage, winding short, current sense resistor short, open loop and overload conditions, it would enter into auto restart mode including Cycle-by-Cycle current limiting. ACT511 is to achieve no overshoot and very short rise time even with a big capacitive load (4000µF) with the built-in fast and soft start process. The Quasi-Resonant (QR) operation mode can improve efficiency, reduce EMI and further reduce the components in input filter. ACT511 is ideal for applications up to 60 Watts. Figure 1: Simplified Application Circuit 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 GENERAL DESCRIPTION The ACT511 is a high performance peak current ...