ACT518 Rev 0, 13-Jun-14 TM ActiveQR Quasi-Resonant PWM Power Switch conventional solutions and exceeds the latest FEATURES ES2.0 efficiency standard with good margin. Integrated Power MOSFET ACT518 integrates comprehensive protection. In CCM and Quasi-Resonant Operation case of over temperature, over voltage, short winding, short current sense resistor, open loop an Adjustable up to 75kHz Switching Frequency d overload conditions, it would enter into auto Integrated Patented Frequency Foldback restart mode including Cycle-by-Cycle current Technique limiting. Integrated Patented Line Compensation ACT518 is to achieve no overshoot and very short rise time even with big capacitive load with the built- Built-in Soft-Start Circuit in fast and soft start process. OCP/OLP Protection In full load condition, ACT518 is able to be Line Under-Voltage, Thermal, Output Over- designed to work in both CCM mode and DCM voltage, Output Short Protections mode to meet different types of applications. Quasi- Resonant (QR) operation mode can effectively Current Sense Resistor Short Protection improve efficiency during DCM operation, and Transformer Short Winding Protection reduce the EMI noise and further reduce the 100mW Standby Power components in input filter. Complies with Global Energy Efficiency and ACT518SH is for application up to 10 Watt and CEC Average Efficiency Standards ACT518DF is for application up to 18 Watt. SOP-8 and DIP-7 Packages Figure 1: Simplified Application Circuit APPLICATIONS Power Supplies for Portable Media Player, DSCs, Set-top boxes, DVD players, records Adaptors for Small home appliances Auxiliary Power Supply for PC,LCD TV and PDP TV GENERAL DESCRIPTION ACT518 is a high performance peak current mode TM PWM power switch. It applies ActiveQR and frequency foldback technique to reduce EMI and improve efficiency. Its maximum design switching frequency is set at 75kHz. Very low standby power, good dynamic response and accurate voltage regulation is achieved with an opto-coupler and the secondary side control circuit. The Idle mode operation enables low standby power of 100mW with small output voltage ripple. TM By applying frequency foldback and ActiveQR technology, The integrated power switch increases the average system efficiency compared to TM Innovative Power - 1 - www.active-semi.com TM ActiveQR is a trademark of Active-Semi. Copyright 2014 Active-Semi, Inc. ACT518 Rev 0 , 13-Jun-14 ORDERING INFORMATION PACKING PART NUMBER TEMPERATURE RANGE PACKAGE PINS TOP MARK METHOD ACT518SH-T -40C to 85C SOP-8 8 TUBE & REEL ACT518SH ACT518DF -40C to 85C DIP-7 7 TUBE ACT518DF PIN CONFIGURATION SOP-8 DIP-7 ACT518SH ACT518DF PIN DESCRIPTIONS PIN NAME DESCRIPTION Current Sense Pin. Connect an external resistor (R ) between this pin and ground to set peak CS 1 CS current limit for the primary switch. 2 FB Feedback Pin. Connect this pin to optocouplerss collector for output regulation. Valley Detector Pin. Connect this pin to a resistor divider network from the auxiliary winding to 3 VDET detect zero-crossing points for valley turn on operation. 4 VDD Power Supply. This pin provides bias power for the IC during startup and steady state operation. 5,6 GND Ground. 7,8 DRAIN MOSFET Drain Pin. TM Innovative Power - 2 - www.active-semi.com TM ActiveQR is a trademark of Active-Semi. Copyright 2014 Active-Semi, Inc.