innovative power tm - 1 - www.active-semi.com copyright ? 2012 active-semi, inc. activeqr tm is a trademark of active-semi. product brief, 05-dec-12 activeqr tm quasi-resonant pwm controller features ? quasi-resonant operation ? adjustable up to 75khz switching frequency ? accurate ocp/olp protection ? integrated patented frequency foldback technique ? integrated patented line and primary inductance compensation ? built-in soft-start circuit ? line under-voltage, thermal, output over- voltage, output short protections ? current sense resistor short protection ? transformer short winding 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 ACT511 is a high performance peak current mode pwm controller. ACT511 applies activeqr tm and frequency foldback technique to reduce emi and improve efficiency. ACT511?s maximum switching frequency is set at 90khz. very low standby power, good dynamic response and accurate voltage regulation is achieved with an opto-coupler and the secondary side control circuit. the burst mode operation enables low standby power of 100mw with small output voltage ripple. by applying frequency foldback and activeqr tm technology, ACT511 increases the average system efficiency compared to conventional solutions and exceeds the latest es2.0 efficiency standard with good margin. ACT511 integrates comprehensive protection. in case of over temperature, over voltage, short winding, short current sense resistor, open loop an d overload conditions, it would enter into auto restart mode including cycle-by-cycle current limiting. ACT511 is to achieve no overshoot and very short rise time even with big capacitive load (4000f) with the built-in fast and soft start process. the quasi-resonant (qr) operation mode can effectively improve efficiency, reduce the emi noise and further reduce the components in input filter. ACT511 is for application up to 60 watt. figure 1: simplified application circuit ACT511
ACT511 product brief, 05-dec-12 innovative power tm - 2 - www.active-semi.com copyright ? 2012 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 ACT511us-t -40c to 85c sot23-6 6 tube & reel fsgt sot23-6 ACT511us 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.
ACT511 product brief, 05-dec-12 innovative power tm - 3 - www.active-semi.com copyright ? 2012 active-semi, inc. activeqr tm is a trademark of active-semi. figure 4: universal vac input, 5v/3a output adaptor
ACT511 product brief, 05-dec-12 innovative power tm - 4 - www.active-semi.com copyright ? 2012 active-semi, inc. activeqr tm is a trademark of active-semi. item reference description qty manufacturer 1 u1 ic, ACT511, sot23-6 1 active-semi 2 c1,c2 capacitor, electrolytic, 15f/400v, 12 14mm 2 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, 820f/10v, 10 11.5mm 2 ksc 6 c7,c8 capacitor, ceramic, 0.1f/25v,0805,smd 2 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 ,1000v1a, 1n4007, do-41 4 good-ark 10 d5,d6 diode, ultra fast, fr107,1000v/1.0a, do-41 2 good-ark 11 d8 diode, schottky, 40v/30a, sbl3040, do-220 1 good-ark 12 l1 dm inductor, 1.5mh,r5 1 soka 13 l2 dm inductor, 3h, r5 1 soka 14 q1 mosfet transisor, 4n65, to-220f 1 st 15 pcb1 pcb, l*w*t = 48.5 29 1.6mm, cem-1, rev:a 1 jintong 16 f1 fusible, 1a/250v 1 ty-ohm 17 r1 carbon resistor, 22 ? , 0805, 5% 1 ty-ohm 18 r2 carbon resistor, 750k ? , 1w, 5% 1 ty-ohm 19 r3 chip resistor, 100 ? , 0805, 5% 1 ty-ohm 20 r4 chip resistor, 4.7 ? , 0805, 5% 1 ty-ohm 21 r5 chip resistor, 53.6k ? , 0805, 1% 1 ty-ohm 22 r6 chip resistor, 9.95k ? , 0805, 1% 1 ty-ohm 23 r7,r8 chip resistor, 1m ? , 0805, 5% 2 ty-ohm 24 r9 chip resistor, 0.953 ? ,1w, 1% 1 ty-ohm 25 r10,r12 chip resistor, 1.5k ? , 0805, 5% 2 ty-ohm 26 rgate chip resistor, 22k ? , 0805, 5% 1 ty-ohm 27 r14 chip resistor, 3.3k ? , 0805, 5% 1 ty-ohm 28 r15 chip resistor, 10.7k ? , 0805, 1% 1 ty-ohm 29 r16 chip resistor, 10.5k ? , 0805, 1% 1 ty-ohm 30 t1 transformer, l p = 0.68mh, ee19 1 31 cy1 y capacitance, 1000pf/400v,y1 1 sec 32 u2 opto-coupler, pc817c ctr = 200 1 sharp 33 u3 voltage regulator, tl431a, v ref = 2.5v 1 st table 1: ACT511 5v15w bill of materials
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