ACT361

Active-Semi FEATURES • Patented Primary Side Regulation Technology ACT361 Product Brief, 15-Apr-11 The ACT361 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 over temperature conditions. The ACT361 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 ACT361 achieves excellent regulation and transient response, yet requires less than 150mW of standby power. The ACT361 is optimized for 2W to 7W applications. It is available in space-saving 6 pin SOT23-6 package. Figure 1: Simplified Application Circuit High Performance ActivePSRTM Primary Switching Regulator • No Opto-Coupler • Best-in-Class Constant Voltage, Constant Current Accuracy • • • • Low EMI Proprietary Fast Startup Circuit Built-in Soft-Start Circuit Integrated Line and Primary Inductance Compensation Resistance Compensation • Integrated Programmable Output Cord • 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 7W • Minimum External Components • Tiny SOT23-6 Package APPLICATIONS • Chargers for Cell Phones, PDAs, MP3, Portable Media Players, DSCs, and Other Portable Devices and Appliances INPUT OUTPUT • RCC Adapter Replacements • Linear Adapter Replacements • Standby and Auxiliary Supplies VDD BD GENERAL DESCRIPTION The ACT361 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 ACT361 meets all of the global energy efficiency regulations (CEC, European Blue Angel, and US Energy Star standards) while using very few external components. ACT361 SW CS G FB Innovative PowerTM ActivePSRTM is a trademark of Active-Semi. -1- www.active-semi.com Copyright © 2011 Active-Semi, Inc. Product Brief, 15-Apr-11 ACT361 TOP MARK FSCR ORDERING INFORMATION PART NUMBER ACT361US-T TEMPERATURE RANGE -40°C to 85°C PACKAGE SOT23-6 PINS 6 PACKING METHOD TAPE & REEL PIN CONFIGURATION SW 1 6 CS FSCR G 2 5 FB BD 3 4 VDD SOT23-6 ACT361US-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 3: Universal VAC Input, 5V/0.7A Output Charger FR1 L1 T1 R1 D4 D1 R2 D3 N R4 D2 + C1 + C2 R10 D5 Q1 GND R8 D7 R11 C7 + VO ACT361 L BD R5 VDD SW FB ACT361 G CS R7 C3 R9 Table 1: ACT361 Bill of Materials ITEM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 REFERENCE U1 C1, C2 C3 C7 D1-D4 D5 D7 L1 Q1 FR1 R1, R2 R4 R5 R7 R8 R9 R10 R11 T1 DESCRIPTION IC, ACT361US-T, SOT23-6 Capacitor, Electrolytic, 4.7µF/400V, 8 × 12mm Capacitor, Electrolytic, 4.7µF/35V, 5 × 11mm Capacitor, Electrolytic, 470µF/10V, 8 × 12mm Diode, Rectifier, 1000V/1A, 1N4007, DO-41 Diode, Ultra Fast, FR102,100V/1.0A, DO-41 Diode, Schottky, 40V/2A, SB240, DO-15 Axial Inductor, 1.5mH, 0410, DIP Transistor, NPN, 900V,1.5A, KSB13003AR, TO-92 Fusible Resistor, 1W, 10Ω, 5% Chip Resistor, 5.1MΩ, 1206, 5% Chip Resistor, 150k, 0805, 5% Chip Resistor, 22Ω, 0603, 5% Chip Resistor, 1.07Ω, 1206, 1% Chip Resistor, 53.6k, 0805, 1% Chip Resistor, 9.76k, 0805, 1% Chip Resistor, 22Ω, 0805, 5% Chip Resistor, 1.1k, 0805, 5% Transformer, LP = 2.3mH±7%, EE16 -3- QTY 1 2 1 1 4 1 1 1 1 1 2 1 1 1 1 1 1 1 1 MANUFACTURER Active-Semi KSC POE KSC Good-Ark Good-Ark Good-Ark Amode Tech Semi How TY-OHM TY-OHM TY-OHM TY-OHM TY-OHM TY-OHM TY-OHM TY-OHM TY-OHM Innovative PowerTM www.active-semi.com Copyright © 2011 Active-Semi, Inc.