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low power pwm controller for off-line battery charger ap3700/a data sheet 1 bcd semiconductor manufacturing limited mar. 2008 rev. 1. 4 general description the ap3700/a is a green-mode pulse width modula- tion (pwm) controller. it is specially designed for low power applications such as off-line battery chargers, where the needs for low standby power, space saving and low cost are all required. in a battery charger rated 5v/1a, the maximum standby power is only 0.18w. in normal operation, the ap3700/a switches on and off at a fixed switching frequency of 60 khz. with a current limit capability of 460ma for ap3700 and 500ma for ap3700a, the ap3700/a can directly drive the emitter of high voltage npn transistor. when output power falls below a given level, the ic enters skip cycle mode to reduce power consumption. the ap3700/a also features under-voltage lockout, over-current and short circuit protections. the ap3700/a is available in to-92 package. features current mode control with skip cycle capability lower operating current: 0.45ma fixed switching frequency: 60 khz frequency dithering for low emi: 2.5khz under-voltage lockout protection over-current protection internal short circuit protection higher output voltage at out terminal low total cost solution applications battery chargers off-line power supplies figure 1. package types of ap3700/a to-92 (ammo packing) to-92 (bulk packing)
low power pwm controller for off-line battery charger ap3700/a data sheet 2 bcd semiconductor manufacturing limited mar. 2008 rev. 1. 4 figure 2. pin configuration of ap3700/a (top view) pin description pin number pin name function 1 vcc the power supply of the ic, and is ge nerally connected to opto-coupler's emitter 2 gnd supply ground 3 out the output pin, connected to the emitte r of npn transistor or the source of mosfet pin configuration z package (to-92) out vcc gnd 1 2 3
low power pwm controller for off-line battery charger ap3700/a data sheet 3 bcd semiconductor manufacturing limited mar. 2008 rev. 1. 4 functional block diagram figure 3. functional block diagram of ap3700/a vcc out gnd 1 pwm control regulator + _ + oscillator bandgap & bias vref 1.24v vref pwm comparator clamp comparator uvlo comparator short circuit comparator driver slope ramp 2 3 + _ + _ + _ vref 1.24v
low power pwm controller for off-line battery charger ap3700/a data sheet 4 bcd semiconductor manufacturing limited mar. 2008 rev. 1. 4 parameter value unit supply voltage -0.3 to 6.0 v voltage at out (note 2) -0.3 to 40 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) 200 v note 1: stresses greater than those li sted under "absolute maximum ratings" may cause permanent damage to the device. these are stress ratings only, and functiona l operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. ex posure to "absolute maximum ratings" for extended periods may affect device reliability. note 2: the breadown voltage. the actual operating vol tage can not be greater than the value listed here. absolute maximum ratings (note 1) package switching frequency temperature range part number marking id packing type lead free green lead free green to-92 60khz -40 to 85 o c ap3700z-e1 ap3700z-g1 3 700z-e1 3700z-g1 bulk ap3700ztr-e1 ap3700ztr-g 1 3700z-e1 3700z-g1 ammo ap3700az-e1 ap3700az-g1 3700az-e1 3700az-g1 bulk ap3700aztr-e1 ap3700aztr-g1 3700az-e1 3700az-g1 ammo 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 blank: ap3700 e1: lead free ap3700 - tr: ammo blank: bulk a: ap3700a package z: to-92 g1: green
low power pwm controller for off-line battery charger ap3700/a data sheet 5 bcd semiconductor manufacturing limited mar. 2008 rev. 1. 4 parameter symbol conditions min typ max unit uvlo section start-up voltage v th (st) 5.00 5.25 5.50 v minimal operating voltage v opr (min) 3.4 3.65 3.9 v standby current section start-up current (note 3) i st v cc =4v 0.22 0.4 ma operating current i cc(opr) 0.45 0.7 v cc zener voltage v z i cc =10ma 6 6.3 v dynamic impedance r vcc v cc =3.8 to 4.8v 18 k ? internal oscillator switching frequency f sw 50 60 75 khz frequency dither 2 2.5 3 khz temperature stability 5 8 % drive output section out start-up voltage v st 8.5 11 v short circuit threashold voltage (note 4) v sc 6v 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 opr (min) + 0.2v 67 75 84 % minimum duty cycle v cc =v th (st) -0.2v 3 driver out on-resistance r out i out =0.06a 3 ? switch off current (out) driver off, v out =10v 20 40 a effective current limit i lim v cc = v opr +0.1v for ap3700 460 ma for ap3700a 500 out current coefficient g a -0.3 a/v (v cc =4v, t j =25 o c, unless otherwise specified.) electrical characteristics note 3: ap3700/a is an emitter drive cont roller, the pwm controller will start up onl y when the voltage on the out pin rises up to its threshould value. note 4: ap3700/a performs its short circui t function by shutdown the out pulse when the out pin voltage drops below its short circuit threshold value.
low power pwm controller for off-line battery charger ap3700/a data sheet 6 bcd semiconductor manufacturing limited mar. 2008 rev. 1. 4 figure 6. switching frequency vs. ambient temperature figure 7. start-up current vs. v cc voltage typical performance characteristics figure 4. operating current vs. ambient temperature fi gure 5. start-up current vs. ambient temperature -40 -25 -10 5 20 35 50 65 80 95 110 125 350 400 450 500 operating current ( a) ambient temperature ( o c) 12345 0 100 200 300 400 500 start-up current ( a) v cc voltage (v) -40 -25 -10 5 20 35 50 65 80 95 110 125 200 220 240 260 280 300 start-up current ( a) ambient temperature ( o c) -40 -25 -10 5 20 35 50 65 80 95 110 125 50 55 60 65 low side frequency for dither high side frequency for dither switching frequency (khz) ambient temperature ( o c)
low power pwm controller for off-line battery charger ap3700/a data sheet 7 bcd semiconductor manufacturing limited mar. 2008 rev. 1. 4 function description 1. startup circuit figure 3 is the functional block diagram of ap3700/a, and there are 3 external pins: the vcc pin, the out pin and gnd pin. in typical application shown by figure 10, the vcc pin is used for both bias supply and feedback control. the out pin directly drives external npn transistor or mosfet, and also provides initial bias pow er for uvlo comparator. when the ic works in pwm mode, the auxiliary winding will supply the v cc enough operating current. figure 8 shows the star t-up sequence of the v cc and the v out . 2. v cc /feedback control an opto-coupler and secondary constant voltage/ current controller consis ts of voltage feedback network. when load is heavy, the voltage on vcc will be lower to enlarge duty cycle; on the contrary, if load drops, the voltage on vcc will rise to reduce duty cycle. 3. frequency dither frequency dither 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 by reducing both quasi- peak and average emi emissions. ap3700/a has reference switching frequency of 60 khz, and its frequency deviation is 2.5khz in period of 2ms. figure 9 shows the frequency dither influence to the waveform . 4. current limit control the ap3700/a employs cu rrent mode control to improve transient response and voltage stability. in figure 10, the external in ductor curren t 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. ch1: v cc ch2: out figure 8. start-up sequence of v cc and v out figure 9. frequency dither influences the swithcing cycle
low power pwm controller for off-line battery charger ap3700/a data sheet 8 bcd semiconductor manufacturing limited mar. 2008 rev. 1. 4 typical application figure 10. 5v/1a output for battery charger of mobile phone + 1 5 2 + j1 ac 85-264v bridge d1-d4 1n4007*4 c1 4 . 7 p d8 1n4148 l2 5.5 p c9 470 p c11 470 p 5v/1a v cc 3 6 4 v out v ctrl v cc i ctrl gnd v sense u3 pc817 + + c2 4.7 p v o + v o - + 1 out vcc gnd 2 3 u1 ap3700 u2 ap4313 + q1 apt13003 d6 1n4148 r6 390 c4 10 p c5 10 p c6 3.3n r7 510 d7 1n4148 r5 4 . 7 + c10 47 p d9 sb240 rs 0.2 r13 6.2k r15 2k r11 510 r10 22k c7 2.2n c8 0.1 p r9 100k r12 100 r8 200 d5 fr107 c3 2200p r4 100k r2 1.5m l1 330 r1 10/1w t1 ee16
low power pwm controller for off-line battery charger ap3700/a data sheet 9 bcd semiconductor manufacturing limited mar. 2008 rev. 1. 4 mechanical dimensions unit: mm(inch) 2.440(0.096) 2.640(0.104) 0.380(0.015) 0.550(0.022) 1.600(0.063) max 14.100(0.555) 14.500(0.571) 1.270(0.050) typ 3.300(0.130) 3.700(0.146) 4.300(0.169) 4.700(0.185) 1.100(0.043) 1.400(0.055) 4.400(0.173) 4.700(0.185) 3.430(0.135) min 0.360(0.014) 0.510(0.020) 0.000(0.000) 0.380(0.015) to-92 (bulk packing)
low power pwm controller for off-line battery charger ap3700/a data sheet 10 bcd semiconductor manufacturing limited mar. 2008 rev. 1. 4 to-92 (ammo packing) unit: mm(inch) mechanical dimens ions (continued) 4.300(0.169) 4.700(0.185) 13.000(0.512) 14.000(0.551) 2.540(0.100) typ 4.500(0.177) 5.500(0.217) 1.270(0.050) typ 0.380(0.015) 0.550(0.022) 4.400(0.173) 4.700(0.185) 3.430(0.135) min 0.360(0.014) 0.510(0.020) 0.000(0.000) 0.380(0.015) max 1.600(0.063) 1.100(0.043) 1.400(0.055) 3.300(0.130) 3.700(0.146)
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 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 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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