?on-bright electronics confidential preliminary datasheet ob_doc_ds_sn03a00 - 1 - sn03a high power factor flyback pwm controller general description sn03a is a high power factor flyback pwm controller special for lighting applications. sn03a features an internal start-up timer for stand-alone applications, an analog multiplier with for power factor correcti on (pfc), zero current detector (zcd) to ensure tm operation, a current sensing comparator with built-in leading-edge blanking, and a totem pole output ideally suited for driving a power mosfet. sn03a offers great protection coverage including system vcc under voltage lockout (uvlo),vcc over voltage protection, cycle-by-cycle current limiting, and gate drive output clamping for external power mosfet protection. features ? low start-up current and operating current ? cycle-by-cycle current limiting ? internal leading edge blanking ? analog multiplier for power factor correction ? internal startup timer for stand-alone applications ? trimmed 1.5% internal band gap reference ? under voltage lockout with hysteresis ? vcc over voltage protection ? transition mode (tm) operation ? totem pole output with high state clamping ? audio noise free ? 11v to 32v wide range of vcc voltage applications ? single stage high pf flyback ac/dc smps ? led lighting power typical application product specification m?w3^vu0t^u5[py?b?g ?pqls?
?on-bright electronics confidential preliminary datasheet ob_doc_ds_sn03a00 - 2 - sn03a high power factor flyback pwm controller general information terminal assignment in sop8 or dip8 package. 1 2 3 4 8 7 6 5 fb comp mult cs vcc gd gnd zcd ordering information part number description SN03AAP 8 pin dip, pb free in tube sn03acp 8 pin sop, pb free in tube sn03acpa 8 pin sop, pb free in t&r package dissipation rating package r ja ( /w) dip8 90 sop8 150 absolute maximum ratings symbol parameter value vcc dc supply voltage vz i_zcd zero current detector max. current 50ma(source) -10ma(sink) cs fb comp mult analog inputs & outputs -0.3 to 7v tj maximum operating junction temperature 150 tstg min/max storage temperature -55 to 150 lead temperature (soldering, 10secs ) 260 note: stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under ?recommended oper ating conditions? is not implied. exposure to absolute maximum-rated conditions for extended periods may affect device reliability. m?w3^vu0t^u5[py?b?g ?pqls?
?on-bright electronics confidential preliminary datasheet ob_doc_ds_sn03a00 - 3 - sn03a high power factor flyback pwm controller marking information terminal descriptions pin num pin name i/o description 1 fb i input of error amplifier. 2 comp o output of error amplifier. a feedbac k network is placed between fb and the comp pin. the voltage of comp and pin 4 generate pwm duty cycle. 3 mult i input of multiplier. connected to li ne voltage after bridge diodes via a resistor divider to provide sinusoidal reference voltage to the current loop. 4 cs i current sense input pin. connected to mosfet current sensing node. 5 zcd i zero current detection input. when activated, a new switching cycle starts. if it is connected to gnd, the device is disabled. 6 gnd p ground pin 7 gd o gate driver output. drive power mosfet. 8 vcc p dc supply voltage. m?w3^vu0t^u5[py?b?g ?pqls?
?on-bright electronics confidential preliminary datasheet ob_doc_ds_sn03a00 - 4 - sn03a high power factor flyback pwm controller block diagram m?w3^vu0t^u5[py?b?g ?pqls?
?on-bright electronics confidential preliminary datasheet ob_doc_ds_sn03a00 - 5 - sn03a high power factor flyback pwm controller electrical characteristics (t a = 2 5 if not otherwise noted) symbol pin parameter test conditions min typ max unit supply voltage section vcc 8 operating range after turn on 11 32 v uvlo(off) 8 vcc under voltage lockout exit 15.5 16.5 17.5 v uvlo(on) 8 vcc under voltage lockout enter 8.0 8.8 9.6 v hys 8 hysteresis 7.7 v vz 8 vcc zener clamp voltage icc=5ma 38 v vcc_ovp 8 vcc ovp threshold 36.5 v supply current section icc-start 8 start-up current vcc=11v 5 15 ua iq 8 quiescent current, no switching vcc=14.5v 1.8 3 ma icc 8 operating supply current gd=1nf @ 70khz 5 7 ma error amplifier section vref 1 ea reference v cc =14.5v 2.45 2.5 2.55 v gv voltage gain open loop 60 80 db gb gain bandwidth 1.2 mh z source current comp=3.6v, fb=2.4v -2 -6 -10 ma icomp 2 sink current comp=3.6v, fb=2.6v 2 6 10 ma upper clamp voltage isource=0.5ma 4.9 v vcomp 2 lower clamp voltage isink=0.2ma 2.25 v multiplier section vmult 3 linear operating range comp=3.0v 0 to 3.5 v vcs/ vmult output max. slope vmult=from 0 to 0.5v, comp=4.9v 0.95 1.1 v/v k gain vmult=1v, comp=3.5v 0.28 0.36 0.44 1/v current sense comparator vcs 4 current sense reference clamp vmult=2.5v comp=4.9v 0.94 1.0 1.06 v td(h-l) 4 delay to output 200 450 ns zero current detector vzcd 5 input threshold voltage trigger level 0.25 v vzcd_hys zcd trigger hysteresis 0.75 v vzcd 5 upper clamp voltage izcd=2.5ma 5.1 5.7 6.3 v vzcd 5 lower clamp voltage izcd=-2.5ma 0 v izcd 5 source current capability -3 -5 ma izcd 5 sink current capability 3 10 ma startup timer tstart re-start timer period 45 55 65 us gate drive section vol 7 low output voltage vcc=14.5v, io=100ma 1.5 v voh 7 high output voltage vcc=14.5v, io=100ma 8 v tr 7 rising time cl=1000pf, 10~90% 80 150 ns tf 7 falling time cl=1000pf, 10~90% 30 70 ns voclamp 7 output clamp voltage vcc=28v 16 18 v m?w3^vu0t^u5[py?b?g ?pqls?
?on-bright electronics confidential preliminary datasheet ob_doc_ds_sn03a00 - 6 - sn03a high power factor flyback pwm controller typical perfomance chart operating curerent(a) vs temp( ) 4.50 4.90 5.30 5.70 6.10 -40 -10 20 50 80 110 140 temp( ) icc(ma) uvlo(on)(v) vs temperature( ) 8.50 8.65 8.80 8.95 9.10 -40 0 40 80 120 temperature( ) uvlo(on)(v) vref(v) vs temperature( ) 2.49 2.52 2.54 2.57 2.59 -40 -10 20 50 80 110 140 temp( ) vref(v) muliplier gain(v) vs temp( ) 0.28 0.31 0.34 0.37 0.40 -40 -10 20 50 80 110 140 tem p( ) k(v) icc_startup(a) vs temp( ) 6.00 6.50 7.00 7.50 8.00 8.50 -40 -10 20 50 80 110 140 temp( ) icc_startup(ua) v(cs) vs v(mult) 0.0 0.2 0.4 0.6 0.8 1.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 v(mult)(v) v(cs)(v) m?w3^vu0t^u5[py?b?g ?pqls?
?on-bright electronics confidential preliminary datasheet ob_doc_ds_sn03a00 - 7 - sn03a high power factor flyback pwm controller operational description sn03a is a high power factor flyback pwm controller special for lighting application. the transition mode control great ly reduces the switch turn-on loss, improves the conversion efficiency and provides very good power factor correction. ? startup current and start up control the typical startup current of sn03a is 5ua when the vcc pin is lower than the uvlo threshold so that vcc could be charged up and start up the device. a high value, low wattage startup resistor can therefore be used to minimize the power loss during the normal operation. ? pwm modulator sn03a employs peak current control in flyback system with power factor correction. the pwm stage compares the comp signal (ea output) with cs pin voltage to generate pwm duty cycle. a new pwm cycle is always triggered by the zero current detection (zcd) block, and exits whenever the cs voltage exceeds comp voltage. ? error amplifier the inverting input of the error amplifier (e/a) is compared to an internal reference voltage (2.5v) to determine comp voltage. an external loop compensation network is placed between comp and fb. comp is subtracted by 2.5v and then is internally connected to the multiplier input, as shown in figure 1. fig.1 ? analog multiplier for power factor correction the built-in analog multiplier output limits the mosfet peak current with respect to the ac half wave rectified input voltage. through controlling the cs comparator threshold as the ac line voltage traverses sinusoidally from zero to peak line voltage, the load appears to be resistive to the ac line and near to unity power factor can be achieved. in sn03a, the two inputs for the multiplier are designed to achieve good linearity over a wide dynamic range to represent an ac line free from distortion. special efforts have been made to assure universal line applications with respect to a 90 to 264 vac range. the multiplier output is internally clamped to 1.0v, as shown in fig.1. ? current sensing comparator and leading edge blanking cycle-by-cycle current limiting is offered in sn03a. the switch current is detected by a sense resistor into the sense pin. an internal leading edge blanking circuit chops off the sense voltage spike at initial mosfet on state due to snubber diode reverse recovery so that the external rc filtering on sense input is no longer required. the current limit comparator is disabled and thus cannot turn off the external mosfet during the blanking period. pwm duty cycle is determined by the current sense input voltage and comp pin voltage. ? zero current detection sn03a performs zero current detection (zcd) by monitoring the voltage activity on the auxiliary windings through zcd pin in series with an external resistor. this voltage features a flyback polarity. when the stored energy of the flyback transformer is fully released to the output, the voltage at zcd pin decreases. when zcd pin voltage falls below 0.25v, an internal zcd comparator is triggered and a new pwm switching cycle is initiated following the zcd triggering. if no zero current triggering signal is detected on zcd pin, the ?startup timer? block in sn03a will generate a restart signal in 55 usec (typ.) after the last pwm signal. the maximum and minimum voltage of zcd pin is internally clamped to 5.8v and 0v respectively. ? gate drive output the output stage is designed to ensure zero cross-conduction current. this minimizes heat dissipation, increase efficiency, and enhance reliability. the output driver is also slew rate controlled to minimize emi. the built-in 16v clamp at the gate output protects the mosfet gate from high voltage stress. ? protection controls sn03a ensures good reliab ility design through its good protection coverage. vcc under voltage lockout (uvlo), vcc over voltage protection(auto recovery), cycle-by-cycle current limiting and output gate clamp are sta ndard features provided by sn03a. m?w3^vu0t^u5[py?b?g ?pqls?
?on-bright electronics confidential preliminary datasheet ob_doc_ds_sn03a00 - 8 - sn03a high power factor flyback pwm controller package mechanical data 8-pin plastic dip dimensions in millimeters dimensions in inches symbol min max min max a 3.710 5.334 0.146 0.210 a1 0.381 0.015 a2 3.175 3.600 0.125 0.142 b 0.350 0.650 0.014 0.026 b1 1.524 (bsc) 0.06 (bsc) c 0.200 0.360 0.008 0.014 d 9.000 10.160 0.354 0.400 e 6.200 6.600 0.244 0.260 e1 7.320 7.920 0.288 0.312 e 2.540 (bsc) 0.1 (bsc) l 2.921 3.810 0.115 0.150 e2 8.200 9.525 0.323 0.375 m?w3^vu0t^u5[py?b?g ?pqls?
?on-bright electronics confidential preliminary datasheet ob_doc_ds_sn03a00 - 9 - sn03a high power factor flyback pwm controller 8-pin plastic sop dimensions in millimeters dimensions in inches symbol min max min max a 1.350 1.750 0.053 0.069 a1 0.050 0.250 0.002 0.010 a2 1.250 1.650 0.049 0.065 b 0.310 0.510 0.012 0.020 c 0.170 0.250 0.006 0.010 d 4.700 5.150 0.185 0.203 e 3.800 4.000 0.150 0.157 e1 5.800 6.200 0.228 0.244 e 1.270 (bsc) 0.05 (bsc) l 0.400 1.270 0.016 0.050 0o 8o 0o 8o m?w3^vu0t^u5[py?b?g ?pqls?
?on-bright electronics confidential preliminary datasheet ob_doc_ds_sn03a00 - 10 - sn03a high power factor flyback pwm controller important notice right to make changes on-bright electronics corp. reserves the right to make corrections, modifications, enhancements, improvements and other changes to its products and se rvices at any time and to discontinue any product or service without notice. customer s should obtain the latest relevant information before placing orders and should verify that such information is current and complete. warranty information on-bright electronics corp. warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with its standard warranty. testing and other quality control techniques are used to the extent it deems necessary to support this warranty. except where mandated by government requirements, testing of all parameter s of each product is not necessarily performed. on-bright electronics corp. assumes no liability for application assistance or customer product design. customers are responsible for their products and a pplications using on-bright?s components, data sheet and application notes. to minimize the risks associ ated with customer products and applications, customers should provide adequate design and operating safeguards. life support on-bright electronics corp.?s products are not design ed to be used as components in devices intended to support or sustain human life. on-bright electroni cs corp. will not be held liable for any damages or claims resulting from the use of its products in medical applications. military on-bright electronics corp.?s products are not de signed for use in military applications. on-bright electronics corp. will not be held liable for any damages or claims resulting from t he use of its products in military applications. m?w3^vu0t^u5[py?b?g ?pqls?
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