ACT412 Rev 1, 30-Oct-13 TM ActivePSR Quasi-Resonant PWM Controller mode including cycle-by-cycle current limiting. FEATURES ACT412 is to achieve no overshoot and very short Patented Primary Side Regulation rise time even with big capacitive load (10000F) Technology with the built-in fast and soft start process, . Quasi-Resonant Operation The Quasi-Resonant (QR) operation mode can Adjustable up to 120kHz Switching effectively improve efficiency, reduce the EMI noise Frequency and further reduce the components in input filter. +/-5% Output Voltage Regulation ACT412 is idea for application up to 36 Watt. Constant Power Operation Mode for Fast Figure 1: Start-up and Motor Drive Applications Simplified Application Circuit Integrated 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 Short Winding Protection Less than 100mW Standby Power Complies with Global Energy Efficiency and CEC Average Efficiency Standards Tiny SOT23-6 Packages APPLICATIONS AC/DC Adaptors/Chargers for E-Shaver, Motor Driver, ADSL, Network Power, Cell Phone Big Capacitive Load Application GENERAL DESCRIPTION The ACT412 is a high performance peak current TM mode PWM controller which applies ActivePSR TM and ActiveQR technology. ACT412 achieves accurate voltage regulation without the need of an opto-coupler or reference device. The ACT412 is designed to achieve less than 100mW Standby Power. By applying frequency fold TM back and ActiveQR technology, ACT412 exceeds the latest ES2.0 efficiency standard. ACT412 integrates comprehensive protection. In case of over temperature, over voltage, short winding, short current sense resistor, open loop and overload conditions, it would enter auto restart TM www.active-semi.com Innovative Power - 1 - TM ActivePSR is a trademark of Active-Semi. Copyright 2013 Active-Semi, Inc. ACT412 Rev 1, 30-Oct-13 ORDERING INFORMATION TEMPERATURE PACKING PART NUMBER PACKAGE PINS TOP MARK RANGE METHOD ACT412US-T -40C to 85C SOT23-6 6 TUBE & REEL FRYS PIN CONFIGURATION SOT23-6 ACT412US 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 GND Ground. 3 GATE Gate Drive. Gate driver for the external MOSFET transistor. 4 VDD Power Supply. This pin provides bias power for the IC during startup and steady state operation. 5 FB Feedback Pin. Connect this pin to a resistor divider network from the auxiliary winding. 6 COMP Compensation Pin. TM www.active-semi.com Innovative Power - 2 - TM ActivePSR is a trademark of Active-Semi. Copyright 2013 Active-Semi, Inc.