innovative power tm - 1 - www.active-semi.com copyright ? 2011 active-semi, inc. activepsr tm is a trademark of active-semi. high performance activepsr tm 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 7w to 12w ? minimum external components ? sop-8 package applications ? rcc adapter replacements ? linear adapter replacements ? standby and auxiliary supplies general description the ACT337 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 ACT337 meets all of the global energy efficiency regulations (cec, european blue angel, and us energy star standards) while using very few external components. the ACT337 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 ACT337 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 ACT337 achieves excellent regulation and transient response, yet requires less than 30mw of standby power. the ACT337 is optimized for compact size 7w to 12w charger applications. it is available in space- saving 8 pin sop-8 package. figure 1: simplified application circuit ACT337 product brief, 15-apr-11 ?
ACT337 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 ACT337sh-t -40c to 85c sop-8 8 tape & reel ACT337sh pin name description sop-8 1 sw 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. 2,4,7 g ground(2,4 and 7 pin mu st be connected together). 8 bd base drive. base driver fo r the external npn transistor. 6 vdd power supply. this pin provides bias powe r for the ic during st artup and steady state operation. 5 fb feedback pin. connect this pin to a resist or divider network from the auxiliary winding. 3 cs current sense pin. connect an external resistor (r cs ) 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) / r cs . for more detailed information, see application information. ordering information sop-8 ACT337sh ACT337sh ACT337 product brief, 15-apr-11 ?
ACT337 product brief, 15-apr-11 innovative power tm - 3 - www.active-semi.com copyright ? 2011 active-semi, inc. ? figure 6: universal vac input, 5v/2 . 1a output charger item reference description qty 1 c1, c2 capacitor, electrolytic, 10f/400v, 1016mm ( low leakage current ) 2 2 c3 capacitor, ceramic,220pf/500v,1206,smd 1 3 c4 capacitor, ceramic, 10f/35v,1206,smd 1 4 c5 capacitor, electrolytic, 1000f/6.3v, 8 16mm 1 5 c6 capacitor, electrolytic, 820f/6.3v, 6.3 16mm 1 6 c9 capacitor, ceramic,1000pf/50v,0805,smd 1 7 cy1 safety y1,capacitor,1000pf/400v,dip 1 8 bd1 bridge rectifier,d1010s,1000v/1.0a,sdip 1 9 d5 fast recovery rectifier, rs1m,1000v/1.0a, rma 1 10 d6 fast recovery rectif ier,rs1d,200v/1.0a,sma 1 11 d8 diode, schottky, 45v/10a, s10u45s, smd 1 12 l1 choke coil, 1.5mh, 6x8mm, dip 1 13 q1 transistor, npn, 700v,d13005,to-126 1 14 f1 fuse:1a 250v 3.6*10mm with pigtail, ceramic tube 1 15 r1 chip resistor, 22 ? , 0805, 5% 1 16 r2 chip resistor, 1m,1206, 5% 1 17 r3 chip resistor, 390 ? ,1206, 5% 1 18 r4 chip resistor, 15 ? , 0805, 5% 1 19 r5 chip resistor, 80.6k,0805, 1% 1 20 r6 chip resistor,18.2k,0805, 1% 1 21 r7 chip resistor, 30m ? , 1206, 5% 1 22 r9 chip resistor, 0.62 ? ,1206, 1% 1 23 r10 chip resistor, 162k,0805, 5% 1 24 r11 chip resistor, 3k, 0805, 5% 1 25 r13 chip resistor, 10 ? , 0805, 5% 1 26 t1 transformer, l p = 1.25mh7%, epc17 1 27 u1 ic, ACT337sh-t,sop-8 1 table 1:ACT337 bill of materials
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