innovative power tm - 1 - www.active-semi.com copyright ? 2011 active-semi, inc. activepsr tm is a trademark of active-semi. product brief, 15-apr-11 high performance activepsr tm primary switching regulator act361 vdd g bd sw fb cs input output features ? patented primary side regulation technology ? 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 ? 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 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 ? rcc adapter replacements ? linear adapter replacements ? standby and auxiliary supplies general description the act361 belongs to the high performance patented activepsr tm 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. the act361 ensures safe operation with complete protection against all fault conditions. built-in protection circuitry is provided for output short- circuit, output over-volt age, line under-voltage, and over temperature conditions. the act361 activepsr tm is optimized for high performance, cost-sensitive applications, and utilizes active-semi?s pr oprietary 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 act361 a ctive-semi
act361 product brief, 15-apr-11 innovative power tm - 2 - www.active-semi.com copyright ? 2011 active-semi, inc. pin configuration pin descriptions part number temperature range package pins packing method top mark ACT361US-T -40c to 85c sot23-6 6 tape & reel fscr pin name description 1 sw switch drive. switch node for the external npn tr ansistor. connect this pin to the external power npn?s emitter. this pin also supplies current to vdd during startup. 2 g ground. 3 bd base drive. base driver fo r the external npn transistor. 4 vdd power supply. this pin provides bias power fo r the ic during startup and steady state op eration. 5 fb feedback pin. connect this pin to a resist or divider network from the auxiliary winding. 6 cs current sense pin. connect an external resistor (r cs ) between this pin and ground to set peak current limit for the primary sw itch. the peak current limit is set by (0.396v 0.9) / r cs . for more detailed information, see application information. 6 5 4 1 2 3 cs fb vdd sw g bd fscr sot23-6 ACT361US-T ordering information
act361 product brief, 15-apr-11 innovative power tm - 3 - www.active-semi.com copyright ? 2011 active-semi, inc. figure 3: universal vac input, 5v/0.7a output charger d1 d2 d3 d4 fr1 l1 c1 + c2 + r1 q1 c7 + r11 act361 sw gnd l n r2 d7 vo bd vdd fb cs g t1 d5 r4 r8 r9 r7 c3 r5 r10 table 1: act361 bill of materials item reference description qty manufacturer 1 u1 ic, ACT361US-T, sot23-6 1 active-semi 2 c1, c2 capacitor, electrolytic, 4.7f/400v, 8 12mm 2 ksc 3 c3 capacitor, electrolytic, 4.7f/35v, 5 11mm 1 poe 4 c7 capacitor, electrolytic, 470f/10v, 8 12mm 1 ksc 5 d1-d4 diode, rectifier, 1000v/1 a, 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, 1.5m h, 0410, dip 1 amode tech 9 q1 transistor, npn, 900v,1.5a, ksb13003ar, to-92 1 semi how 10 fr1 fusible resistor, 1w, 10 ? , 5% 1 ty-ohm 11 r1, r2 chip resistor, 5.1m ? , 1206, 5% 2 ty-ohm 12 r4 chip resistor, 150k, 0805, 5% 1 ty-ohm 14 r7 chip resistor, 1.07 ? , 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 18 r11 chip resistor, 1.1k, 0805, 5% 1 ty-ohm 19 t1 transformer, l p = 2.3mh7%, ee16 1 13 r5 chip resistor, 22 ? , 0603, 5% 1 ty-ohm 17 r10 chip resistor, 22 ? , 0805, 5% 1 ty-ohm
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