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low power pwm controller for off-line adapter AP3710 data sheet 1 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 general description the AP3710 is a green-mode pwm controller, its main applications are low power supplies such as offline battery chargers, adapters, stb and other auxiliary supplies, where the needs fo r low no load power, low total cost and high reli ability are all required. the functional blocks of AP3710 include: under volt- age lockout with low start-up current; precise voltage reference for internal co mparators; pwm comparator with current limit control, feedback signal and band- gap input; short circuit comparator and open circuit protection for opto-coupler. the AP3710 operates at a fixed 60khz switching fre- quency, its output connects to the emitter of high volt- age npn transistor or the source of mosfet. in normal mode, it works as a switch to turn on or turn off the external transistor. in failure modes like open loop, over voltage or overload due to short circuit, the chip enters into an auto restart mode controlled by the inter- nal protection unit. the AP3710 is available in soic-8 and dip-8 pack- ages. features current mode control with skip cycle capability low start-up current: 0.25ma low operating current: 0.45ma output current capacity: 900ma fixed switching frequency: 60khz frequency dithering for low emi under-voltage lockout with hysteresis built-in slope compensation short circuit protection open and short circuit protection for opto- coupler maximum input power is 0.2w under no load maximum input power is 1w under 0.5w load low total cost solution applications adapters battery chargers set top boxes auxiliary supplies dvd figure 1. package types of AP3710 soic-8 dip-8
low power pwm controller for off-line adapter AP3710 data sheet 2 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 pin configuration figure 2. pin configuration of AP3710 (top view) gnd nc vcc out nc va nc vsen pin description pin number pin name function 1 gnd power supply ground 2 vcc the power supply of the ic and this term inal is also used for the feedback control 3, 6, 8 nc not connected 4 out the pwm output is directly connected to the emitter of npn transistor or the source of mosfet 5vsen it is used for line voltage compensation, and pwm uses this to terminate the output switch conduction 7va it is used for short circui t protection, and this termin al will be pulled down to low level when short circuit happens at the load side m package (soic-8) 1 2 3 4 8 7 6 5 gnd nc vcc out nc va nc vsen p package (dip-8) 1 2 3 4 8 7 6 5
low power pwm controller for off-line adapter AP3710 data sheet 3 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 functional block diagram figure 3. functional block diagram of AP3710 vcc out gnd vsen va 2 + - oscillator pwm comparator uvlo comparator driver 1 4 + - f b - discharge comparator + _ vref (1.2v) 5 7 vref (1.2v) vref (1.2v) bias start-up current source pwm control discharge logic slop compensation
low power pwm controller for off-line adapter AP3710 data sheet 4 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 parameter value unit supply voltage -0.3 to 6.3 v voltage at out -0.3 to 40 v analog input at v sen -0.3 to 6.3 v output current at out internally limited a power dissipation 0.6 w operating junction temperature 150 o c storage temperature -65 to 150 o c lead temperature (soldering, 10s) 300 o c esd (machine model) 250 v esd (human body model) 3000 v note 1: stresses greater than those li sted under "absolute maximum ratings" may cause permanent dama ge to the device. these are stress ratings only, and functional operation of the de vice at these or any other conditions beyond t hose indicated under "recommended operating co nditions" is not implied. exposure to "a bsolute maximum ratings " for extended periods may affect device reliability. absolute maximum ratings (note 1) package switching frequency temperature range part number marking id packing type lead free green lead free green soic-8 60khz -40 to 85 o c AP3710m-e1 AP3710m-g1 3710m-e1 3710m-g1 tube AP3710mtr-e1 AP3710mtr-g1 3710m-e1 3710m-g1 tape & reel dip-8 60khz -40 to 85 o c AP3710p-e1 AP3710p-g1 AP3710p-e1 AP3710p-g1 tube bcd semiconductor's pb-free products, as design ated with "e1" suffix in the part number, are rohs compliant. products with "g1" suffix are available in green packages. ordering information circuit type package e1: lead free AP3710 - tr: tape and reel blank: tube m: soic-8 p: dip-8 g1: green
low power pwm controller for off-line adapter AP3710 data sheet 5 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 parameter symbol conditions min typ max unit uvlo section turn on threshold voltage v cc (on) 5.30 5.60 5.90 v turn off threshold voltage v cc (off) 3.4 3.65 3.90 v discharge voltage v dis 2.7 2.9 3.1 v standby current section start-up current i st v cc =4v 0.25 0.4 ma operating current i cc (opr) 0.45 0.7 v cc zener voltage v z i cc =10ma 6.5 7 7.5 v dynamic impedance r vcc v cc =3.8 to 4.8v (note 2) 10 18 30 k ? internal oscillator switching frequency f sw (note 3) 50 60 70 khz frequency dithering 2 3.5 5 khz temperature stability -40 to 85 o c 5% drive output section out turn-on voltage v out (on) 7.6 9.3 11 v out turn-off voltage v out (off) 5.7 6.8 7.9 v rise time t r c l =1nf, 15 ? pull-up 60 ns fall time t f c l =1nf, 15 ? pull-up 30 maximum duty cycle d max v cc (off) + 0.2v 68 75 82 % minimum duty cycle v cc =v cc (on)-0.2v 3 5 driver out on-resistance r out i out =0.7a 3 5 ? switch off current (out) driver off, v out =10v 20 40 a effective current limit i lim v cc =v cc (off)+0.5v 800 900 ma out current coefficient g a -0.6 a/v current section maximum input signal v sen 0.9 1.0 1.1 v v cc =4v, t j =25 o c, unless otherwise specified. electrical characteristics note 2: guaranteed by design, not tested in production. note 3: the fixed oscillation frequency, the frequency jitter ing is not included.
low power pwm controller for off-line adapter AP3710 data sheet 6 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 electrical characteristics (continued) figure 4. the test circuit for current limit + + AP3710 + _ v in =10v r 100 w /3w c1 100 f/50v 1n5819 l 70 h 27v zener c2 100 f/50v c3 2200pf out vcc gnd v cc =v cc (off)+0.5v
low power pwm controller for off-line adapter AP3710 data sheet 7 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 figure 7. start-up current vs. v cc voltage figure 8. switching fr equency vs. ambient temperature typical performance characteristics figure 5. operating current vs. ambient temperature fi gure 6. start-up current vs. ambient temperature -40 -20 0 20 40 60 80 100 120 320 360 400 440 480 520 560 600 640 680 operating current ( a) ambient temperature ( o c) -40-20 0 20406080100120 120 160 200 240 280 320 360 400 start-up current ( a) ambient temperature ( o c) 12345 0 100 200 300 400 500 start-up current ( a) v cc voltage (v) -40-20 0 20406080100120 56 58 60 62 64 66 68 70 switching frequency (khz) ambient temperature ( o c)
low power pwm controller for off-line adapter AP3710 data sheet 8 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 -40-20 0 20406080100120 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 discharge voltage (v) ambient temperature ( o c) figure 11. on resistance vs. ambient temperature figure 12. turn on voltage vs. ambient temperature typical performance ch aracteristics (continued) figure 9. normalized current limit figure 10. discharge volta ge vs. ambient temperature -40 -20 0 20 40 60 80 100 120 0.80 0.85 0.90 0.95 1.00 1.05 1.10 normalized current limit ambient temperature ( o c) vs. ambient temperature -40-20 0 20406080100120 5.0 5.1 5.2 5.3 5.4 5.5 turn on threshold voltage (v) ambient temperature ( o c) -40-20 0 20406080100120 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 on resistance ( ? ) ambient temperature ( o c)
low power pwm controller for off-line adapter AP3710 data sheet 9 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 function description 1. uvlo and start up circuit the AP3710's turn on threshold voltage is 5.6v and its turn off threshold voltage is 3.65v, so the uvlo hysteresis voltage is 1.95v, which helps AP3710 to draw adequate energy to supply vcc terminal during start-up. please see figur e 13 for uvlo chart. the vcc terminal in figure 3 is used for both bias supply and feedback control. when AP3710 is powered on, the start-up curr ent source turns on and it can not turn off until vcc level increases to its threshold value and pwm pulse is produced. in start-up section of typical application shown by figure 14, the rectified line voltage v in charges the capacitor c4 through start-up resistor r2+r3 until q1 is turned on so out term inal can directly drive external q1, a mosfet in side AP3710 is connected in series with the q1. once the start-up is set up, the auxiliary bias winding will supply the vcc terminal enough operating current. the start-up sequence is shown in figure 15. vcc: supply voltage (v) turn on turn off icc: supply current ( a) 5.6 3.65 figure 13. 5.6/3.65v uvlo threshold of AP3710 figure 14. the s tart - up circuit of typical application figure 15. power up waveforms u3 pc817 + out vcc gnd u1 AP3710 + q1 apt13003 d6 r6 c4 c5 c6 r7 d6 r5 r16 r14 c7 r16 vsen va r13 v in rectified ac v o r2+r3 u2 az431 r8
low power pwm controller for off-line adapter AP3710 data sheet 10 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 2. vcc/feedback control in figure 14, an opto-coupler and secondary constant voltage consists of voltage feedback network. voltage feedback loop consists of shunt regulator az431 and fb/vcc terminal of AP3710. when load is heavy, the voltage on vcc terminal wi ll decrease to enlarge duty cycle; on the contrary, if load drops, the voltage on vcc will increase to reduce duty cycle. 3. skip cycle mode operation the AP3710 enters skip cycl e mode when load power drops below a given level, and this is performed by sensing the vcc voltage level, i.e., the heavier load power, the lower vcc voltage level. in normal operation, the vcc terminal indicates a peak inductance current under cer tain load power. if the load power decreases, vcc voltage level increases to ask for less peak current. when it reaches a determined value, the ic prevents the current from decreasing further down and starts to blank the output pulses, the ic then enters the skip cycle mode operation. figure 16 is the sketch for the two operation mode. 4. slope compensation the AP3710 is current mode pwm controller, and it regulates peak inductance current by its current control loop. it is known that a continuous conduction mode smps may induce noise and harmonic oscillation on current sense or feedback signal, and this is especially seriou s when duty cycle exceeds 50%. the internal slope compensation of AP3710 can improve power supply stability by increasing the current slope. 5. current limit control the AP3710 employs current mode control to improve transient response and voltage stability. in figure 3, the external inductor current through the out pin is converted to a voltage by an internal resistor, and this voltage will participate to control duty cycle and peak inductor current. 6. frequency dithering frequency dithering is performed by periodically spreading a single switchin g frequency into adjacent frequency band, so the peak energy is spread. this technique can improve emi performance by reducing both quasi peak and average emi emissions. function description (continued) figure 17. frequency dither influences the switching cycle normal pwm waveform cycle skip waveform figure 16. skip cycle and normal pwm waveform t 0
low power pwm controller for off-line adapter AP3710 data sheet 11 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 function description (continued) 7. short circuit protection internal short circuit cont rol can protect a smps from being damaged when short circuit at its output happens. in figure 18, when vcc drops below its turn off threshold value, the uvlo comparator's output will control the discharge logic to pull va terminal to low level, and the low level is kept before the vcc voltage drops below the threshold value of discharge compara- tor. then the system will re-startup from c4 charging again and the same process will repeat indefinitely. the long start-up period makes the input power low enough to ensure the whole system in safety under output short circuit condition. figure 18 . short circuit protection block discharge logic discharge comparator from uvlo va v ref 1.2v from vcc
low power pwm controller for off-line adapter AP3710 data sheet 12 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 typical application figure 19. 12v/1a adapter + + j1 ac 85-264v d1-d4 c1 l3 c8 c9 12v/1a u3 + + c2 v o + v o - + out vcc gnd u1 + q1 d6 r6 c4 c5 c6 r7 d5 r5 d8 zd2 r16 c7 r15 d7 c3 r4 r2 l2 r1 t1 ee16 f1 r11 vsen va r13 u2 c11 l4 r3 r9 r14 r8 c10
low power pwm controller for off-line adapter AP3710 data sheet 13 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 bill of material s for figure 19 designator part type designator part type r1 resistor, nt c resistor, 5 ? c1, c2 electrolytic capacitor, 10 f/400v, 10 r2, r3 resistor, 1m ? , 1206 c3 capacitor, 2200pf, d=5mm r4 resistor, 68k ? , 1206 c4, c5 capacitor, 10 f, d=4.5mm r5 resistor, 3 ? , 0805 c6 capacitor, 22nf, 0805 r6 resistor, 200 ? , 0805 c7 capacitor, 0.47 f, 0805 r7 resistor, 2k ? , 0805 c8 electrolytic capacitor, 1000 f r8 resistor, 5.1m ? , sip c9 electrolytic capacitor, 220 f r9, r15, r16 resistor, 3k ? , 0805 c10 y capacitor, 2200pf r11 resistor, 15 ? , 1206 c11 capacitor, 1nf, 0805 r13 resistor, 1k ? , 0805 l2 inductor, 300 h/0.3a r14 resistor, 11.4k ? , 0805 l4 inductor, 100 h/1a t1 transformer, ee-20 d1 to d4 diode, 1n4007, do-41 zd2 zener, 13v/1w d5, d6 diode, 1n4148, ll-34 q1 transistor, apt13003e, to-126 d7 diode, fr107, do-15 u1 ic, AP3710 d8 diode, 3100, do-201 u3 opto-coupler, pc817, dip-4
low power pwm controller for off-line adapter AP3710 data sheet 14 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 mechanical dimensions unit: mm(inch) soic-8 0 8 1 5 r 0 . 1 5 0 ( 0 . 0 0 6 ) r0.150(0.006) 1.000(0.039) 0.330(0.013) 0.510(0.020) 1.350(0.053) 1.750(0.069) 0.100(0.004) 0.300(0.012) 0.900(0.035) 0.800(0.031) 0.200(0.008) 3.800(0.150) 4.000(0.157) 7 7 2 0 : 1 d 1.270(0.050) typ 0.190(0.007) 0.250(0.010) 8 d 5.800(0.228) 6.200(0.244) 0.675(0.027) 0.725(0.029) 0.320(0.013) 8 0.450(0.017) 0.800(0.031) 4.700(0.185) note: eject hole, oriented hole and mold mark is optional.
low power pwm controller for off-line adapter AP3710 data sheet 15 bcd semiconductor manufacturing limited jan. 2013 rev. 1. 4 mechanical dimens ions (continued) dip-8 unit: mm(inch) 4 6 r0.750(0.030) 0.254(0.010)typ 0.130(0.005)min 8.200(0.323) 9.400(0.370) 0.204(0.008) 0.360(0.014) 7.620(0.300)typ 4 6 5 0.700(0.028) 9.000(0.354) 9.600(0.378) 3.710(0.146) 4.310(0.170) 3.000(0.118) 3.600(0.142) 0.360(0.014) 0.560(0.022) 2.540(0.100) typ 6.200(0.244) 6.600(0.260) 3.200(0.126) 3.600(0.142) 0.510(0.020)min 3.000(0.118) depth 0.100(0.004) 0.200(0.008) 1.524(0.060) typ note: eject hole, oriented hole and mold mark is optional.
important notice bcd semiconductor manufacturing limited reserves the right to make changes without further not ice to any products or specifi- cations herein. bcd semiconductor manufacturing limited does not as sume any responsibility for us e of any its products for any particular purpose, nor does bcd semiconductor manufacturi ng limited assume any liability aris ing out of the application or use of any its products or circui ts. bcd semiconductor manufacturing limited does not convey any license under its patent rights or other rights nor the rights of others. - wafer fab shanghai sim-bcd semiconductor manufacturing co., ltd. 800 yi shan road, shanghai 200233, china tel: +86-21-6485 1491, fax: +86-21-5450 0008 main site regional sales office shenzhen office shanghai sim-bcd semiconductor manuf acturing co., ltd., shenzhen office unit a room 1203, skyworth bldg., gaoxin ave.1.s., nanshan district, shenzhen, china tel: +86-755-8826 7951 fax: +86-755-8826 7865 taiwan office bcd semiconductor (taiwan) company limited 4f, 298-1, rui guang road, nei-hu district, taipei, taiwan tel: +886-2-2656 2808 fax: +886-2-2656 2806 usa office bcd semiconductor corp. 30920 huntwood ave. hayward, ca 94544, usa tel : +1-510-324-2988 fax: +1-510-324-2788 - headquarters bcd semiconductor manufacturing limited no. 1600, zi xing road, shanghai zizhu sc ience-based industrial park, 200241, china tel: +86-21-24162266, fax: +86-21-24162277 bcd semiconductor manufacturing limited important notice bcd semiconductor manufacturing limited reserves the right to make changes without further not ice to any products or specifi- cations herein. bcd semiconductor manufacturing limited does not as sume any responsibility for us e of any its products for any particular purpose, nor does bcd semiconductor manufacturi ng limited assume any liability aris ing out of the application or use of any its products or circui ts. bcd semiconductor manufacturing limited does not convey any license under its patent rights or other rights nor the rights of others. - wafer fab shanghai sim-bcd semiconductor manufacturing limited 800, yi shan road, shanghai 200233, china tel: +86-21-6485 1491, fax: +86-21-5450 0008 bcd semiconductor manufacturing limited main site regional sales office shenzhen office shanghai sim-bcd semiconductor manuf acturing co., ltd. shenzhen office advanced analog circuits (shanghai) corporation shenzhen office room e, 5f, noble center, no.1006, 3rd fuzhong road, futian district, shenzhen 518026, china tel: +86-755-8826 7951 fax: +86-755-8826 7865 taiwan office bcd semiconductor (taiwan) company limited 4f, 298-1, rui guang road, nei-hu district, taipei, taiwan tel: +886-2-2656 2808 fax: +886-2-2656 2806 usa office bcd semiconductor corporation 30920 huntwood ave. hayward, ca 94544, u.s.a tel : +1-510-324-2988 fax: +1-510-324-2788 - ic design group advanced analog circuits (shanghai) corporation 8f, zone b, 900, yi shan road, shanghai 200233, china tel: +86-21-6495 9539, fax: +86-21-6485 9673 bcd semiconductor manufacturing limited http://www.bcdsemi.com bcd semiconductor manufacturing limited

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