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2012 . 0 2 ver. f . copyright grenergy o pto, inc. www.grenergy - ic.com 1 preliminary gr883 7c feature s ? current m ode c ontrol ? standby p ower below 100mw ? under - v oltage l ockout (uvlo) ? non - a udible - n oise g reen - m ode c ontrol ? 65khz s witching f requency ? internal l eading - e dge b lanking ? internal s l ope c ompensation ? in ternal s oft s tart ? gate o utput v oltage c lam p ? jitter and soft driving for r educing emi ? over - l oad p rotection (olp ) - auto recovery m ode ? vcc ovp p rotection - auto recovery m ode ? 300ma d riving c apability application ? switching ac/dc adapter description the GR8837C is a highly - integrated, low startup curren t, current mode pwm controller with g reen - mode function . the integrated functions also include the leading - edge blanking of the current sensing, internal slope com pensation , soft start o l p, and ovp . th ese function s enable the power supply to easily meet eve n the strictest power requirements . the GR8837C improves the performance and reduces the cost of power supplies. it is with 8 - pin dip and 6 - pin sot - 26 package o ? open frame smps ? battery charger ordering and marking information j: dip-8 c: sot-26 GR8837C package code rohs code g: green (halogen free) device l: pb free device dip - 8 gr 8837c x x xxx serial no. code 1 code 2 sot - 26 code 1 37c x x x x x serial no. code 2 code 1 8 9 a b g h i j year 2008 2009 2010 2011 2016 2017 2018 2019 code 2 1 2 3 4 9 a b c month jan. feb. mar. apr. sep. oct. nov. dec . grenergy opto inc. reserves the right to make changes to improve reliability or manufacture ability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. green - mode pwm c ontroller with p rotection
2012 . 0 2 ver. f . copyright grenergy o pto, inc. www.grenergy - ic.com 2 preliminary gr883 7c gnd comp bno out vcc cs 1 2 3 4 5 6 pin configuration pin description p in no. n ame function 1 gnd ground pin 2 comp voltage feedback pin, by connecting a photo - coupler to control the duty cycle 3 bno brownout protection pin. connect a resistor divider between this pin and bulk capac itor voltage to set t he brownout level. if the voltage is less than threshold voltage, the pwm output will be disabled 4 cs current sense pin, connect to sense the mosfet current 5 vcc power s upply pin 6 out the output driver for driving the external mosfet absolute maxi mum ratings supply v oltage v cc --------------------------------------- --- --------------------------------------------------------------- 3 0 v comp, bno , cs ------------------------------------------------------------------------------------------------- --- - 0.3 ~ 7v out --------------- --- ---------------------------------------------------------------------------------- ------- - 0.3 ~ v cc + 0.3 v junction t emperature ------------------------------- ------------- ---------------- ----- ----- --------------- -- ---------------- 150 operating a mbient t emperature ------------------------------------------------------------------------------ - 2 0 ~ 85 storage t emperature r ange --- ------------------------------------------------------------------------------- - 65 ~ 150 sot - 26 p ackage t hermal r esistance (junction to ambient) -------------------- ------ - ----------------------- 2 50 / w power d issipation (sot - 26, at a mbient t emperature = 85) ----------------------- ------------------------- 250mw power d issipation (dip - 8, at a mbie nt t emperature = 85) --------------------------------------------------- 650mw lead t emperature (all pb f ree p ackages, s oldering, 10 sec) ------------------------------------------------- - 260 esd v oltage p rotection, h uman b ody m odel --------------- ----------------------------------------------------------- 2 kv esd v oltage p rotection, m achine m odel -------------------------------------------------------------------- ---------- 2 0 0v
2012 . 0 2 ver. f . copyright grenergy o pto, inc. www.grenergy - ic.com 3 preliminary gr883 7c electrical characteristics ( v cc = 15.0v & t a = +25 , unless otherw ise specified. ) parameter pin min. typ. max. unit supply voltage startup c urrent (vcc=uvlo on - 1v) 5 8 15 ua operating c urrent (with 1nf load on out pin), vcomp = 0v 5 800 u a operating c urrent (with 1nf load on out pin), v comp = 2.5v 5 2 ma op erating c urrent (with 1nf load on out pin), p rotection t ripped (olp, ovp) 5 0. 7 ma uvlo(off) 5 5.8 6. 8 7.8 v uvlo(on) 5 10.3 11.3 12.3 v ovp l evel on vcc p in - auto r ecovery mode 5 27 28 29 v vcc l evel in latch m ode (3meg start - up res istor ) 5 6 v voltage feedback short c ircuit c urrent, vcomp = 0v 2 0.8 ma open l oop v oltage, comp p in o pen 2 4.4 5.5 v green - m ode start v oltage 2 1.5 v burst mode start v oltage 2 0.85 v current sensing maximum i nput v oltage, vcs(off) - auto r ecovery mode 4 0.8 0 0. 85 0. 9 v leading - e dge b lanking t ime 4 3 50 ns input i mpedance 4 1 m delay to output 4 1 0 0 ns oscillator frequency - 60 65 70 khz jitter f requency - + 6 % green m ode f requency - 20 22 25 khz temp. s tability ( - 40c ~ 1 10 c) - 5 % voltage s tability (v cc = 11v~25v) - 3 % gate drive r output output l ow l evel , vcc = 15v, i o = 20ma 6 1 v output h igh l evel, vcc = 15v, io = 20 ma 6 8 v rising t ime, l oad c apacitance = 1000 pf 6 200 ns falling t ime, l oad c apacitance = 1000 pf 6 80 ns vgate - c lamp (vcc = 25v ) 6 13 v olp section olp t rip l evel, vcomp (o lp) - 3.5 v olp d elay t ime - 60 ms
2012 . 0 2 ver. f . copyright grenergy o pto, inc. www.grenergy - ic.com 4 preliminary gr883 7c pwm s ection maximum d uty c ycle - 70 75 80 % brownout function brownout turn - on trip level 1.1 v brownout turn - off trip level 0.8 v
2012 . 0 2 ver. f . copyright grenergy o pto, inc. www.grenergy - ic.com 5 preliminary gr883 7c typical performance characteristics uvlo (on) (v) fig. 1 uvlo (on) vs. temperature 1 0 .3 1 0 . 4 10.5 10.6 1 0.7 1 0.8 - 40 0 40 80 120 125 temperature ( ) temperature ( ) 6.5 6.7 6.8 7.0 6.6 - 40 0 40 80 120 125 6.9 uvlo (off) (v) fig. 2 uvlo (off) vs. temperature vdd start up current (ua) fig. 3 vdd start up current vs. temperature 2.0 4.0 6.0 8.0 10.0 12.0 - 40 0 40 80 120 125 temperature ( ) operating current (ma) fig. 4 operating current vs. temperature 1.2 1.4 1.6 1.8 2.0 2.2 - 40 0 40 80 120 125 temperature ( ) olp-trip level (v) fig. 5 olp trip level vs. temperature - - 40 0 40 80 120 125 3. 0 3. 2 3. 4 3. 6 3.8 4. 0 temperature ( ) maximum input voltage of cs pin(v) fig. 6 maximum input voltage of cs pin vs. temperature - 40 0 40 80 120 125 0.85 0.86 0.87 0.88 0.89 0.90 temperature ( )
2012 . 0 2 ver. f . copyright grenergy o pto, inc. www.grenergy - ic.com 6 preliminary gr883 7c frequency (khz) fig. 7 frequency vs. temperature - 40 0 40 80 120 125 63 64 65 66 67 68 temperature ( ) green mode frequency (khz) fig. 8 green mode frequency vs. temperature - 40 0 40 80 120 125 20 21 22 23 24 2 5 temperature ( )
2012 . 0 2 ver. f . copyright grenergy o pto, inc. www.grenergy - ic.com 7 preliminary gr883 7c application information start - up current the typical start - up current is around 8ua. very low start - up current allows the pwm controller to increase the value of start - up resistor and then reduce the power dissipation on it. uvlo (under volta ge lockout) a hysteresis uvlo comparator is implemented in GR8837C , then the turn - on and turn - off thresho lds level are fixed at 1 1.3 v and 6.8 v respectively. this hysteresis shown in fi g . 9 ensures that the start - up capacitor will be adequate to supply the chip during start - up. t he GR8837C is designed to meet the standby power below 100mw. so the start - up resistor can be used as several mega ohms to reduce the power loss. due to the low uvlo on level, so the turn - on delay time will also never greater than th e general pwm ic. uvlo (on) 11.3v uvlo (off) 6.8v vcc fig. 9 soft start during initial power on, the GR8837C provides 16ms soft start function. it effectively suppresses the start up peak current to reduce the power mosfet drain voltage especially at high line . o scillator the maximum duty - cycle of internal oscillator is limited to 7 5 % for avoid ing the transformer saturation. the frequency of th e oscillator is fix ed to 65khz by in ternal setting . green - mode operation when t he load decreases to an extent, the freque ncy of the controller will decrease so as to reduc e the system power consumption. t he minimum frequency is about 2 2 k hz , which is outside the audio range . leb (leading - edge blanking) each time the power mosfet is switch ed on, a turn - on spike will inevitabl y occur at the sense resistor. to avoid fault trigger, a 3 50 ns l eading - edge blanking time is built in. conventional rc filtering can therefore be omitted. during this blanking period, the current - limit comparator is disabled and can not sw itch off the gate driver. internal slope compensation a built - in slope compensation circuit is constructed in GR8837C . when the sw itch is on, a ramp voltage is added to the sensed voltage across the cs pin, which helps to stabilize the system and prevent the sub - harmonic o scillations . olp (over load protection) the GR8837C has over load protection function. an internal circuit detects the load level, when the load is larger than a threshold level and the condition lasts more than 60ms, the gate output will keep on low level . then vcc decreases below uvlo off leve l, the controller resets again. fig . 1 0 shows the waveform of the olp operation. fig. 10 vcc uvlo ( on ) uvlo ( off ) t t comp olp 3.5 v t out olp delay time switching switching non - switching olp trip level ( off ) olp counter reset
2012 . 0 2 ver. f . copyright grenergy o pto, inc. www.grenergy - ic.com 8 preliminary gr883 7c ovp (over voltage protection) on vcc to prevent power mosfet from being damaged , t he GR8837C is implement e d an ovp f unction on vcc. when the vcc voltage is higher than the ovp threshold voltage, the output gate driver circuit will be shut down immediately to stop the sw itching of power mosfet. the vcc pin ovp fu nction is a auto - recovery type protection . GR8837C i s worki ng in auto - recovery mode as shown in fig. 11 . fig. 11 gate clamp/soft driving driver is clamped to 13v by an internal clamping circuit . a totem pole gate driver is fine tuned to meet both emi and efficiency requirement in low power application. an internal pull low circuit is activated after pretty low v dd to prevent external mosfet from accidentally turning on during uvlo. vcc mode operation in order to avoid the output voltage shut down by load changing from full to no load, the gr8837 is built - i n the vcc mode function. when the load from full changes to no load, the output voltage will overshoot and pull low the comp pin by feedback loop. thus the duty will disappear and no power delivers to the secondary. if there is without any mechanism to pre vent this situation, the vcc pin voltage will down to uvlo off and the ic will re - start again. in the GR8837C , before the vcc is down to uvlo off, it will force the out pin outputs the specified duty to pull the vcc higher than uvlo off. the operation is s hown in fig.12. vcc uvlo(off) t t load t out switching vcc mode(on) vcc mode(off) full load vcc mode burst mode fig. 12 the vcc mode function is used to prevent the output re - start again when load changes. so never let the system operate on the vcc mode at no load. the system should operate on burst mode, otherwise the i nput power maybe become larger. brownout protection the GR8837C programmable to set the brownout protection point through bno pin. the voltage across the bno pin is proportional to the bulk capacitor voltage , referred as the line voltage. a brownout compar ator is implemented to detect the abnormal line condition. as soon as the condition is detected, it will shut down the controller to prevent the damage . when vbno falls below 0.80v, the gate output will be kept off even vcc has already achieved uvlo(on). it therefore makes vcc hiccup between uvlo(on) and uvlo(off). unless the line voltage is large enough to pull vbno larger than 1.05v, the gate output will not start switching even when the next uvlo(on) is tri pped. a hysteresis is implemented to prevent th e false trigger during turn - on and turn - off. vcc uvlo(on) uvlo(off) t ovp tripped t out switching switching non-switching ovp level
2012 . 0 2 ver. f . copyright grenergy o pto, inc. www.grenergy - ic.com 9 preliminary gr883 7c typical application circuit d3 gbu206 f1 2a/ 250v c2 82u/ 400v l n t1a er28 c4 1000u/ 25v i c1b el817 t1b c6 10u/ 50v d1 1n4007 c9 0. 1u r20 1k d2 1n4007 r7 51k c3 2200p/ 1kv r2 10r r1 22r c1 470p/ 1kv l3 r3*15:0. 7*15ts c5 470u/ 25v vout gnd i c3 ka431az r19 510r i c1a el817 r21 34k cy1 1kp r6 750k r5 750k c7 0. 01u c8 0. 1u r13 27r r14 100r q1 7a/ 600v r16 0. 62 l2 uu10. 5 cx1 0. 33u r10 51k d4 10a/ 150v c10 100p r22 5. 1k 19v/ 2. 11a t nt c1 5 ohm/ 3a r8 51k comp 2 bno 3 gnd 1 out 6 vcc 5 cs 4 i c2 GR8837C l1 t12*6*4 r3 1. 5m r4 1. 5m r17 nc r18 nc r9 100 r15 10k r23 r1/ 4w r11 r1/ 4w r12 r1/ 8w d6 d1a
2012 . 0 2 ver. f . copyright grenergy o pto, inc. www.grenergy - ic.com 10 preliminary gr883 7c p ackage information sot - 26 symbol sot - 26 millimeters inches min. max. min. max. a 1.45 0.057 a1 0.00 0.15 0.000 0.006 a 2 0 .90 1.30 0.035 0.051 b 0.30 0.50 0.012 0.020 c 0.08 0.22 0.003 0.009 d 2.70 3.10 0.106 0.122 e 2.60 3.00 0.102 0.118 e1 1.40 1.80 0.055 0.071 e 0.95 bsc 0.037 bsc e1 1.90 bsc 0.075 bsc l 0.30 0.60 0.012 0.024 0 o 8 o 0 o 8 o note: 1. followed from jedec to - 178 ab. 2. dimension d and e1 do not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 10 mil per side
2012 . 0 2 ver. f . copyright grenergy o pto, inc. www.grenergy - ic.com 11 preliminary gr883 7c p ackage information dip -8 sy mbol dip - 8 millimeters inches min. max. min. max. a 5.33 0.210 a1 0.38 0.015 a2 2.92 4.95 0.115 0.195 b 0.36 0.56 0.014 0.022 b2 1.14 1.78 0.045 0.070 c 0.20 0.35 0.008 0.014 d 9.01 10.16 0.355 0.400 d1 0.13 0.005 e 7.62 8.26 0.300 0.325 e1 6.10 7.11 0.240 0.280 e 2.54 bsc 0.100 bsc ea 7.62 bsc 0.300 bsc eb 10.92 0.430 l 2.92 3.81 0.115 0.150 note: 1. followed from jedec ms - 001 ba. 2. dimension d, d1 and e1 do not include mold flash or protrusions. mold flash or p rotrusions shall not exceed 10 mil.
2012 . 0 2 ver. f . copyright grenergy o pto, inc. www.grenergy - ic.com 12 preliminary gr883 7c carrier tape & reel dimensions sot - 26 application a h t1 c d d w e1 f sot - 26 178.0 2 .0 0 50 min. 8.4+2.00 - 0.00 13.0+0.50 - 0.20 1.5 min. 20.2 min. 8.0 0.3 0 1.75 0. 10 3.5 0.05 p0 p1 p2 d 0 d1 t a 0 b 0 k 0 4.0 0.10 4.0 0.10 2.0 0.05 1.5+0.1 0 - 0.0 0 1.0 m in . 0.6 +0. 00 -0. 4 0 3.20 0. 2 0 3.10 0. 2 0 1.50 0. 20 (mm) application carrier width cover tape width devices per reel sot - 26 8 5.3 3000
2012 . 0 2 ver. f . copyright grenergy o pto, inc. www.grenergy - ic.com 13 preliminary gr883 7c tape and specification reel sot 26 ______________________________________________________________________ grenergy opto, inc. reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. direction of feed

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