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2011.05 ver. a copyright grenergy opto, inc. www.g renergy-ic.com 1 preliminary GL8216 features transition mode (tm) pfc control non-isolation flyback topology precision current regulation for led cycle-by-cycle over current protection vcc pin over voltage protection output open protection constant on time pwm control programmable ct pin for pfc optimization application led lighting general description the GL8216 is a high performance non-isolation ac/dc off-line switching mode single stage pfc control ic for led lighting. it?s built-in an accur acy +/- 1% reference voltage for current regulation. th e feedback control loop is easily compensated by connected a capacitor to comp pin and ground. the application circuit for constant current is ver y simple without any opamp required. it?s suitable fo r low cost led driver with pfc requirement and accuracy led current. ordering and marking information sop-8 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 change s to improve reliability or manufacture ability wit hout notice, and advise customers to obtain the latest version of re levant information to verify before placing orders. non-isolation high power factor led driver
2011.05 ver. a copyright grenergy opto, inc. www.g renergy-ic.com 2 preliminary GL8216 pin configuration top view ct cs zcd gnd 4 3 2 1 cc comp vcc drv 5 6 7 8 pin description pin no. name function 1 cc the constant current pin is connected to the i nternal error amplifier. 2 comp the comp pin is connected to the output of internal error amplifier. adding compensation network to stabilize the control loop and get higher power factor. 3 ct the ct pin is connected to the current source to ch arge the external capacitor and compare the comp voltage to terminate the power switch. 4 cs the current sense pin is connected to the input of ocp comparator, and terminates the power switch when the current sense voltage is beyond threshold. 5 zcd the zero current detector input, which is connected to an auxiliary winding to monitor the zero crossing current of the inductor. when the zcd detects that the winding has been demagnetized, it will send the set signal to turn on the external mosfet. 6 gnd the ground pin. 7 drv the drv pin is connected to the totem pole gate dri ver to drive the external power switch. 8 vcc positive power supply pin.
2011.05 ver. a copyright grenergy opto, inc. www.g renergy-ic.com 3 preliminary GL8216 absolute maximum ratings supply voltage vcc ------------------------------- --------------------------------------------------- ----------------------------- 30v junction temperature ----------------------------- --------------------------------------------------- ---------------------- 150 operating ambient temperature -------------------- --------------------------------------------------- ------- -20 ~ 85 storage temperature range ------------------------ --------------------------------------------------- --------- -65 ~ 150 sop-8 package thermal resistance ----------------- --------------------------------------------------- ------------- 160 /w power dissipation (sop-8, at ambient temperature = 85 ) ------------------------------------------------ --- 400mw lead temperature (all pb free packages, soldering, 10sec) ------------------------------------------- ----------- 260 esd voltage protection, human body model --------- --------------------------------------------------- -------------------- 2kv esd voltage protection, machine model ------------ --------------------------------------------------- ------------------- 200v block diagram
2011.05 ver. a copyright grenergy opto, inc. www.g renergy-ic.com 4 preliminary GL8216 electrical characteristics (v cc = 15v, t a = 25c, unless otherwise specified.) parameter symbol test conditions min typ max units supply section vcc turn-on threshold (uvlo on) uvlo on 12.5 13.5 14.5 v vcc turn-off threshold (uvlo off) uvlo off 9 10 11 v vcc uvlo on/off hysteresis uvlo hyst 3.5 v operation current i vcc c load = 1nf, f sw =70khz 2.5 3.2 ma c load = 0f, f sw =70khz 1.6 2.5 ma startup current i vccstart vcc= uvlo on - 0.5v 21 50 ua vcc over voltage protection vcc ovp 26 28 30 v zero current detector section upper clamp voltage v zcdh i zcd = 2.5ma 4.3 4.8 5.3 v lower clamp voltage v zcdl i zcd = -2.5ma -0.4 -0.2 0 v arming voltage (positive-going edge) v zcda 1.2 1.4 1.6 v arming voltage (negative-going edge) v zcdt 0.5 0.7 0.9 v input bias current v zcdb 1 1.5 2 ua protection sense section over load protection vcomp threshold v olp 2.6 3.0 v output over voltage protection v ovp 0.35 v internal voltage reference section reference voltage v ref t a = 25 o c 198 200 202 mv line regulation v reg 13v < vcc < 20v 2 5 mv temp. stability t stab -40 o c Q t amb Q 125 o c 0.5 1 % total variation v tot over vcc and tj ranges 2.5 mv voltage error amplifier section transconductance g m vin=0.1 to 0.3v 100 120 140 us source current i source cc=0.1v -10 -12 -14 ua sink current i sink cc=0.3v 10 12 14 ua effective v comp voltage v comp eff 3.2 3.5 3.8 v input bias current i ib cc= 0.2v -25 o c Q t amb Q 125 o c -0.25 -1.25 ua sourcing current i comp cc=0v -0.5 -1 -2 ma current limit section peak current limit protection (i pklmt ) i sns voltage threshold v isns 0.7 0.8 0.9 v leading edge blanking time t leb 350 450 550 ns delay to output t td 130 220 ns
2011.05 ver. a copyright grenergy opto, inc. www.gr energy-ic.com 7 preliminary GL8216 gate driver section output low level v ol io = 20ma 1 v output high level v oh io = -20ma 8 v rising time t r c load = 1nf, vcc= 15v 280 500 ns falling time t f c load = 1nf, vcc= 15v 80 150 ns gate clamp voltage v drv vcc=20v 10 15 v ramp control section ct charge current i ct v ct =0v -80 -100 -120 ua start timer period t st 75 160 300 us
2011.05 ver. a copyright grenergy opto, inc. www.gr energy-ic.com 7 preliminary GL8216 typical performance characteristics uvlo (on) (v) fig. 1 uvlo (on) vs. temperature temperature ( c) 13.0 13.4 13.8 14.2 14.6 15.0 -40 0 4 0 8 0 120 1 25 uvlo (off) (v) temperature ( c) fig. 2 uvlo (off ) vs. temperature 9 10.6 11 .4 13 9.8 -40 0 40 80 120 125 12.2 operating current (c load = 1nf) (ma) temperature ( c) fig. 3 operating current (c load = 1nf) vs. temperature 2.2 2.6 2.8 3.2 2.4 -40 0 40 80 120 125 3.0 operating current (c load = 0nf) (ma) temperature ( c) fig. 4 operating current (c load = 0nf) vs. temperature 1.0 1.8 2.2 3.0 1.4 -40 0 40 80 120 125 2.6 startup current ( a) temperature ( c) fig. 5 startup current vs. temperature 6.0 10 .0 12.0 16 .0 8.0 -40 0 40 80 120 125 1 4.0 ct capacitor charge current ( a) temperature ( c) fig. 6 ct capacitor charge current vs. temperature 96 10 0 102 10 6 98 -40 0 40 80 120 125 1 04
2011.05 ver. a copyright grenergy opto, inc. www.gr energy-ic.com 7 preliminary GL8216 typical performance characteristics(cont.) reference voltage (ma) temperature ( c) fig. 7 reference voltage vs. temperature 19 3 19 7 199 20 3 19 5 -40 0 40 80 120 125 2 01
2011.05 ver. a copyright grenergy opto, inc. www.gr energy-ic.com 7 preliminary GL8216 application information overview the GL8216 contains a programmable timer, a transconductance error amplifier used in a feedback loop, an over current comparator, a current sense comparator, a zero current detector, a pwm and logic circuit, a totem pole mosfet driver, an internal voltage reference, a restart timer and und er voltage lockout circuit. it achieves the pfc functi on by using constant on time and voltage mode control. constant on time the on time of pulse width to drive mosfet is determined by the input ct pin and the error amplifier output comp pin. the input ct pin provides the saw tooth waveform to compare with the comp pin signal. the driver turned off when ct pin voltage reaches to comp pin voltage. due to the boundary mode operation of the transformer, the pfc function is implemented naturally by constant on time mode control. trnascondutance error amplifier with an external capacitor between the pins comp and gnd, the transconductance error amplifier forms an active low pass filter. the low pass filte r monitors the average output current over several line cycles. typically the filter?s bandwidth is se t below 10hz in order to suppress the 100hz line ripple of the output current. the non-inverting inp ut is biased internally at an accuracy reference volta ge 0.2v. the inverting input cc pin is directly connected to the sense resistor series with led. the gate drive is disabled when cc voltage is more than 0.35v. over current comparator because of the feedback loop with low bandwidth, the fast changes of the output current can?t be regulated within an adequate time. fast output changes occur during initial start-up. during this fast changes, a peak current is flowing through the external sense resistor series to led. if this curr ent exceeds an internal defined margin the over current comparator shut down the gate driver to reduce the output current. current sense comparator an external sense resistor connected to the mosfet source and ground transfers the source current of the mosfet into a sense voltage. the signal is compared with internal reference voltage 0.8v. the switch-on peak current of the mosfet is blanked out via a leading edge blanking circuit wit h a blanking time of typically 450ns. zero current detector the zero current detector senses the inductor current via an auxiliary winding and ensures that t he next on-time of the mosfet is initiated immediately when the inductor current has reached zero. this diminishes the reverse recovery losses of the flyback converter diode. the mosfet is switched off when the voltage of the ct pin reaches the voltage level of the error amplifier output. so the inductor current waveform has a triangular shape and there are no dead-time gaps between the cycles. this leads to an ac line current proportion al to line voltage. to prevent false tripping the zero current detector is designed as a schmitt-trigger with a hysteresis of 0.7v. an internal 4.8v clamp protects the input from overvoltage breakdown. an external resistor has to be used in series with the auxiliary winding to limit the current through the clamps.
2011.05 ver. a copyright grenergy opto, inc. www.gr energy-ic.com 7 preliminary GL8216 restart timer the restart timer function eliminates the need of a oscillator. the timer starts or restarts the GL8216 when the drive output has been off for more than 160us after the inductor current reaches zero. under-voltage lockout an under voltage lockout circuit switches the ic on when vcc reaches the uvlo(on) threshold and switches the ic off when vcc is falling below the uvlo(off) threshold. during star up the supply current is less than 50ua. an internal voltage clamp has been added to protect the ic from vcc overvoltage. typical application circuit cs comp gnd zcd ct vcc drv cc n l emi filter GL8216
2011.05 ver. a copyright grenergy opto, inc. www.g renergy-ic.com 8 preliminary GL8216 package information sop-8 symbol inches min. max. a 0.057 0.069 a1 0.004 0.010 a2 0.053 0.059 d 0.189 0.196 e 0.150 0.157 h 0.228 0.244 l 0.016 0.050 o 0 8
2011.05 ver. a copyright grenergy opto, inc. www.g renergy-ic.com 9 preliminary GL8216 carrier tape & reel dimensions sop- 8 application a h t1 c d d w e1 f sop-8 330.0 2.0 50 min. 12.4+2.00 -0.00 13.0+0.50 -0.20 1.5 min. 20.2 min. 12.0 0.30 1.75 0.10 5.5 0.05 p0 p1 p2 d0 d1 t a0 b0 k0 4.0 0.10 8.0 0.10 2.0 0.05 1.5+0.10 -0.00 1.5 min. 0.6+0.00 -0.40 6.40 0.20 5.20 0.20 2.10 0.20 (mm) devices per unit application carrier width cover tape width devices per reel sop- 8 12 - 2500 ___________________________________________________ _____________________ grenergy opto, inc. reserves the right to make corr ections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinu e any product or service without notice. customers should obtain the latest relevant information before placing orders and shou ld verify that such information is current and comp lete.

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