innovative power tm - 1 - www.active-semi.com copyright ? 2014 active-semi, inc. activeqr tm is a trademark of active-semi. product brief, 18-feb-14 activeqr tm quasi-resonant pwm controller features ? ccm and quasi-resonant operation ? adjustable up to 75khz switching frequency ? ocp/olp protection ? integrated patented frequency foldback technique ? integrated patented line compensation ? built-in soft-start circuit ? line under-voltage, thermal, output over- voltage, output short protections ? current sense resistor short protection ? transformer winding short protection ? 100mw standby power ? complies with global energy efficiency and cec average efficiency standards ? tiny sot23-6 packages applications ? ac/dc adaptors/chargers for cell phones, cordless phone, pdas, e-books ? adaptors for portable media player, dscs, set-top boxes, dvd players, records ? linear adapter replacements general description the act512 is a high performance peak current mode pwm controller. act512 applies activeqr tm and frequency foldback technique to reduce emi and improve efficiency. act512?s maximum design switching frequency is set at 75khz. very low standby power, good dynamic response and accurate voltage regulation is achieved with an opto-coupler and the secondary side control circuit. the idle mode operation enables low standby power of 100mw with small output voltage ripple. by applying frequency foldback and activeqr tm technology, act512 increases the average system efficiency compared to conventional solutions and exceeds the latest es2.0 efficiency standard with good margin. act512 integrates comprehensive protection. in case of over temperatur e, over voltage, winding short, current sense resistor short, open loop and overload conditions, it would enter into auto restart mode including cycle-by-cycle current limiting. act512 is to achieve no overshoot and very short rise time even with a big capacitive load with the built-in fast and soft start process. in full load condition, act512 is able to be designed to work in both ccm mode and dcm mode to meet different types of applications. quasi- resonant (qr) operation mode can improve efficiency during dcm operation, and reduce emi and further reduce the components in input filter. act512 is ideal for applications up to 60 watts. figure 1: simplified application circuit act512
act512 product brief, 18-feb-14 innovative power tm - 2 - www.active-semi.com copyright ? 2014 active-semi, inc. activeqr tm is a trademark of active-semi. pin configuration pin descriptions part number temperature range package pins packing method top mark ACT512US-T -40c to 85c sot23-6 6 tube & reel fsht sot23-6 act512us ordering information pin name description 1 cs current sense pin. connect an external resistor (r cs ) between this pin and ground to set peak current limit for the primary switch. 2 gnd ground. 3 gate gate drive. gate driver fo r the external mosfet transistor. 4 vdd power supply. this pin provides bias power fo r the ic during startup an d steady state operation. 5 vdet valley detector pin. connect this pin to a resist or divider network from the auxiliary winding to detect zero-crossing points for valley turn on operation. 6 fb feedback pin. connect this pin to opt ocouplers?s collector for output regulation.
act512 product brief, 18-feb-14 innovative power tm - 3 - www.active-semi.com copyright ? 2014 active-semi, inc. activeqr tm is a trademark of active-semi. figure 4: universal vac input, 12v/2a output adaptor
act512 product brief, 18-feb-14 innovative power tm - 4 - www.active-semi.com copyright ? 2014 active-semi, inc. activeqr tm is a trademark of active-semi. item reference description qty manufacturer 1 u1 ic, act512, sot23-6 1 active-semi 2 c1 capacitor, electrolytic, 47f/400v, 16 14mm 1 ksc 3 c3 capacitor, ceramic,1000pf/500v,0805,smd 1 poe 4 c4 capacitor, electrolytic, 4.7f/35v, 5 11mm 1 ksc 5 c5,c6 capacitor, electrolytic, 680f/25v, 10 11.5mm 2 ksc 6 c8 capacitor, ceramic, 0.1f/50v,0805,smd 1 poe 7 c9 capacitor, ceramic,1000pf/100v,0805,smd 1 poe 8 cfb capacitor, ceramic, 1000pf/50v,0805,smd 1 poe 9 d1-d4 diode, rectifier ,1000v2a, rl207, do-41 4 good-ark 10 d5,d6 diode, ultra fast, fr107,1000v/1.0a, do-41 2 good-ark 11 d8 diode, schottky, 100v/20a , sbl20100, do-220 1 good-ark 12 l1 cm inductor, 30mh, uu10.5 1 soka 13 bead1,2 t6*2*3, r5 2 soka 14 l3 dm inductor, 3h, r5 1 soka 15 q1 mosfet transisor, 4n65, to-220f 1 st 16 pcb1 pcb, l*w*t = 48.5 29 1.6mm, cem-1, rev:a 1 jintong 17 f1 fusible, 2a/250v 1 ty-ohm 18 r12 chip resistor, 3.3k ? , 0805, 5% 1 ty-ohm 19 r2 carbon resistor, 100k ? , 2w, 5% 1 ty-ohm 20 r3 chip resistor, 100 ? , 0805, 5% 1 ty-ohm 21 r4 chip resistor, 4.7 ? , 0805, 5% 1 ty-ohm 22 r5 chip resistor, 54.9k ? , 0805, 1% 1 ty-ohm 23 r6 chip resistor, 11.7k ? , 0805, 1% 1 ty-ohm 24 r7,r8 chip resistor, 1m ? , 0805, 5% 2 ty-ohm 25 r9 chip resistor, 0.87 ? ,1w, 1% 1 ty-ohm 26 r10 chip resistor, 510 ? , 0805, 5% 1 ty-ohm 27 r14 chip resistor, 300k ? , 0805, 5% 1 ty-ohm 28 r15 chip resistor, 23.7k ? , 0805, 1% 1 ty-ohm 29 r16 chip resistor, 6.19k ? , 0805, 1% 1 ty-ohm 30 rgate chip resistor, 47 ? , 0805, 5% 1 ty-ohm 31 t1 transformer, l p = 0.8mh, rm8 1 32 ntc thermistor, sc053 1 ty-ohm 33 tvs varistor, 10471 1 ty-ohm 34 cx1 x capacitance, 0.22f/400v,x1 2 35 cy1 y capacitance, 2200pf/400v,y1 1 sec 36 u2 opto-coupler, pc817c ctr = 200% 1 sharp 37 u3 voltage regulator, tl431a, v ref = 2.5v 1 st table 1: act512 12v24w bill of materials
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