ACT334

® ACT334 Product Brief, 15-Apr-11 over temperature conditions. The ACT334 ActivePSRTM is optimized for high performance, cost-sensitive applications, and utilizes Active-Semi’s proprietary primary-side feedback architecture to provide accurate constant voltage, constant current (CV/CC) regulation without the need of an opto-coupler or reference device. Integrated line and primary inductance compensation circuitry provides accurate constant current operation despite wide variations in line voltage and primary inductance. Integrated output cord resistance compensation further enhances output accuracy. The ACT334 achieves excellent regulation and transient response, yet requires less than 30mW of standby power. The ACT334 is optimized for compact size 2W to 6W charger applications. It is available in spacesaving 6 pin SOT23-6 package. Figure 1: Simplified Application Circuit High Performance ActivePSRTM Primary Switching Regulator FEATURES • Ultra Low Standby Power < 30mW • Patented Primary Side Regulation Technology • Suitable Operation Frequency up to 85kHZ • Proprietary Fast Startup Circuit • Integrated Line and Primary Inductance Compensation • Integrated Programmable Output Cord Resistance Compensation • Line Under-Voltage, Output Over-Voltage, Output Short-Circuit and Over-Temperature Protection • Complies with all Global Energy Efficiency and CEC Average Efficiency Standards • Adjustable Power from 2W to 6W • Minimum External Components • Tiny SOT23-6 Package APPLICATIONS • Chargers for Cell Phones, PDAs, MP3, Portable Media Players, DSCs, and Other Portable Devices and Appliances • RCC Adapter Replacements • Linear Adapter Replacements • Standby and Auxiliary Supplies GENERAL DESCRIPTION The ACT334 belongs to the high performance patented ActivePSRTM Family of Universal-input AC/DC off-line controllers for battery charger and adapter applications. It is designed for flyback topology working in discontinuous conduction mode (DCM). The ACT334 meets all of the global energy efficiency regulations (CEC, European Blue Angel, and US Energy Star standards) while using very few external components. The ACT334 ensures safe operation with complete protection against all fault conditions. Built-in protection circuitry is provided for output shortcircuit, output over-voltage, line under-voltage, and Innovative PowerTM ActivePSRTM is a trademark of Active-Semi. -1- www.active-semi.com Copyright © 2011 Active-Semi, Inc. ® Product Brief, 15-Apr-11 ACT334 ORDERING INFORMATION PART NUMBER ACT334US-T TEMPERATURE RANGE -40°C to 85°C PACKAGE SOT23-6 PINS 6 PACKING METHOD TAPE & REEL TOP MARK FSTA PIN CONFIGURATION SW 1 6 CS FSCR FSTA G 2 5 FB BD 3 4 VDD SOT23-6 ACT334US-T PIN DESCRIPTIONS PIN 1 2 3 4 5 6 NAME SW G BD VDD FB CS DESCRIPTION Switch Drive. Switch node for the external NPN transistor. Connect this pin to the external power NPN’s emitter. This pin also supplies current to VDD during startup. Ground. Base Drive. Base driver for the external NPN transistor. Power Supply. This pin provides bias power for the IC during startup and steady state operation. Feedback Pin. Connect this pin to a resistor divider network from the auxiliary winding. Current Sense Pin. Connect an external resistor (RCS) between this pin and ground to set peak current limit for the primary switch. The peak current limit is set by (0.396V × 0.9) / RCS. For more detailed information, see Application Information. Innovative PowerTM -2- www.active-semi.com Copyright © 2011 Active-Semi, Inc. ® Product Brief, 15-Apr-11 Figure 6: Universal VAC Input, 5V/1A Output Charger ACT334 Table 1: ACT334 Bill of Materials Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Reference C1,C2 C3 C4 C5,C6 C9 D1-D4 D5,D6 D8 L1 Q1 FR1 R2 R3 R1,R4 R5 R6 R7,R8 R9 R10 R11 R13 T1 U1 Description Capacitor, Electrolytic, 6.8uF/400V, 10x12mm Capacitor, Ceramic,220pF/500V,1206,SMD Capacitor, Ceramic,4.7uF/35V,1206,SMD Capacitor, Electrolytic, 680uF/10V, 8x12mm Capacitor, Ceramic,1000pF/50V, 0805, SMD Diode,Rectifier,1000V/1A,1N4007, DO-41 Diode,Ultra Fast, FR107,1000V/1.0A, DO-41 Diode, schottky, 40V/5A, SB540, DO-15 Axial Inductor, 1.5mH, 0410,Dip Transistor, HFE 20-25, NPN,13003,TO-126 Wire Round Resistor,1W,10 ohm,KNP, 5% Chip Resistor, 1.5M ohm, 1206, 5% Chip Resistor, 100 ohm, 1206, 5% Chip Resistor, 22 ohm, 0805, 5% Chip Resistor, 51.1K ohm, 0805,1% Chip Resistor, 9.53K ohm, 0805, 1% Chip Resistor, 15M ohm, 1206, 5% Chip Resistor, 1.0ohm, 1206,1% Chip Resistor, 162K ohm, 0805, 5% Chip Resistor, 3.9K ohm, 0805, 5% Chip Resistor, 10 ohm, 0805, 5% Transformer, Lp=1.5mH, EFD15 IC, ACT334US-T,SOT23-6 -3- QTY 2 1 1 2 1 4 2 1 1 1 1 1 1 2 1 1 2 1 1 1 1 1 1 Manufacturer Koshin POE POE G-Luxon POE Good-Ark Good-Ark Good-Ark Amode Tech Huawei TY-OHM TY-OHM TY-OHM TY-OHM TY-OHM TY-OHM TY-OHM TY-OHM TY-OHM TY-OHM TY-OHM Active-Semi www.active-semi.com Innovative PowerTM Copyright © 2011 Active-Semi, Inc.