ACT361 Active-Semi Product Brief, 15-Apr-11 High Performance ActivePSRTM Primary Switching Regulator 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. FEATURES • Patented Primary Side Regulation Technology • No Opto-Coupler 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. • 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 • Integrated Programmable Output Cord Resistance Compensation • Line Under-Voltage, Output Over-Voltage, Output Short-Circuit and Over-Temperature Protection The ACT361 is optimized for 2W to 7W applications. It is available in space-saving 6 pin SOT23-6 package. • Complies with all Global Energy Efficiency and CEC Average Efficiency Standards • Adjustable power from 2W to 7W • Minimum External Components • Tiny SOT23-6 Package Figure 1: Simplified Application Circuit APPLICATIONS INPUT • Chargers for Cell Phones, PDAs, MP3, OUTPUT Portable Media Players, DSCs, and Other Portable Devices and Appliances • RCC Adapter Replacements • Linear Adapter Replacements • Standby and Auxiliary Supplies VDD BD GENERAL DESCRIPTION ACT361 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. Innovative PowerTM ActivePSRTM is a trademark of Active-Semi. SW CS FB G -1- www.active-semi.com Copyright © 2011 Active-Semi, Inc. ACT361 Product Brief, 15-Apr-11 ORDERING INFORMATION PART NUMBER TEMPERATURE RANGE PACKAGE PINS PACKING METHOD TOP MARK ACT361US-T -40°C to 85°C SOT23-6 6 TAPE & REEL FSCR PIN CONFIGURATION 1 G 2 BD 3 FSCR SW 6 CS 5 FB 4 VDD SOT23-6 ACT361US-T PIN DESCRIPTIONS PIN NAME 1 SW 2 G 3 BD 4 VDD 5 FB Feedback Pin. Connect this pin to a resistor divider network from the auxiliary winding. 6 CS 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 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. -2- www.active-semi.com Copyright © 2011 Active-Semi, Inc. ACT361 Product Brief, 15-Apr-11 Figure 3: Universal VAC Input, 5V/0.7A Output Charger L1 FR1 L T1 R1 D4 D1 VO R2 D3 D2 + C1 + C2 R10 D7 D5 R11 C7 + Q1 N GND R4 R8 BD R5 VDD SW ACT361 G FB CS R7 C3 R9 Table 1: ACT361 Bill of Materials ITEM REFERENCE 1 U1 2 C1, C2 DESCRIPTION QTY MANUFACTURER IC, ACT361US-T, SOT23-6 1 Active-Semi Capacitor, Electrolytic, 4.7µF/400V, 8 × 12mm 2 KSC 3 C3 Capacitor, Electrolytic, 4.7µF/35V, 5 × 11mm 1 POE 4 C7 Capacitor, Electrolytic, 470µF/10V, 8 × 12mm 1 KSC 5 D1-D4 Diode, Rectifier, 1000V/1A, 1N4007, DO-41 4 Good-Ark 6 D5 Diode, Ultra Fast, FR102,100V/1.0A, DO-41 1 Good-Ark 7 D7 Diode, Schottky, 40V/2A, SB240, DO-15 1 Good-Ark 8 L1 Axial Inductor, 1.5mH, 0410, DIP 1 Amode Tech 9 Q1 Transistor, NPN, 900V,1.5A, KSB13003AR, TO-92 1 Semi How 10 FR1 Fusible Resistor, 1W, 10Ω, 5% 1 TY-OHM 11 R1, R2 Chip Resistor, 5.1MΩ, 1206, 5% 2 TY-OHM 12 R4 Chip Resistor, 150k, 0805, 5% 1 TY-OHM 13 R5 Chip Resistor, 22Ω, 0603, 5% 1 TY-OHM 14 R7 Chip Resistor, 1.07Ω, 1206, 1% 1 TY-OHM 15 R8 Chip Resistor, 53.6k, 0805, 1% 1 TY-OHM 16 R9 Chip Resistor, 9.76k, 0805, 1% 1 TY-OHM 17 R10 Chip Resistor, 22Ω, 0805, 5% 1 TY-OHM 18 R11 Chip Resistor, 1.1k, 0805, 5% 1 TY-OHM 19 T1 Transformer, LP = 2.3mH±7%, EE16 1 Innovative PowerTM -3- www.active-semi.com Copyright © 2011 Active-Semi, Inc.