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2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 1 preliminary gr8875 series features high-voltage (700v) startup circuit very low startup current (<30ua) under-voltage lockout (uvlo) hv discharge technology to remove x-cap discharge resistors for good power saving 50mw standby power non-audible-noise green-mode control 65khz switching frequency with jittering for reducing emi cycle-by-cycle peak current limiting internal leading-edge blanking internal slope compensation gate output maximum voltage clamp internal 6ms soft start soft driving for reducing emi ac input brownout protection with hysteresis programmable over temperature latch (otp) function over-voltage protection (ovp) on vcc pin over-load protection (olp) flexible latch shutdown combination: ovp; ovp+otp 500ma driving capability sop-8 /sop-7/dip-8 green package applications adaptor/ open frame power supply lcd monitor/tv power supply description the gr8875 series is a highly-integrated, low startup current, current mode pwm controller with green-mode function, high-voltage start up circuit, and provides several protections such as olp, ovp, and ocp for fault conditions. a high-voltage curren t source supplies the start up current and the traditional start up resistance can be saved in ord er to reduce the start up power loss. the controller also includes the leading-edge blanking of the current sensing, internal slope compensation and cycle-by-cycle peak current limiting. it is also integrated soft driving for reducing emi, gate outp ut voltage clamp function for protecting power mosfet. ordering and marking information sop-7 /sop-8 / dip-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 chang es to improve reliability or manufacture ability wi thout notice, and advise customers to obtain the latest version of relevant informatio n to verify before placing orders . green-mode pwm controller with high voltage startup circuit
2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 2 preliminary gr8875 series pin description pin symbol description 1 rtl latch trigger pin, which a high over 3.5v for ovp l atch off and a low below 1.05v for otp latch 2 comp voltage feedback pin, by connecting a photo- coupler to control the duty cycle. 3 cs current sense pin, connect to sense the mosfet current 4 gnd ground 5 out the output driver for driving the external mo sfet 6 vcc power supply pin 7 nc unconnected pin 8 hv this pin provides the startup current. when uvlo (o n) is tripped, this hv loop will be off and limit the power loss on the startup circ uit. family code gr8875 gr8875 l gr8875 r gr8875 h frequency 65khz 65khz 65khz 100khz olp/scp auto-recovery latch auto-recovery auto-recovery vcc ovp latch latch auto-recovery auto-recovery latch pin latch latch latch latch
2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 3 preliminary gr8875 series absolute maximum ratings supply voltage vcc ------------------------------- --------------------------------------------------- ----------------------- 30v high-voltage pin, hv ----------------------------- --------------------------------------------------- ------------- - 0.3 ~ 500v comp, rtl, cs ------------------------------------ --------------------------------------------------- ---------------- -0.3 ~ 7v junction temperature ----------------------------- --------------------------------------------------- -------------------- 150 operating ambient temperature -------------------- --------------------------------------------------- ------ -40 ~ 85 storage temperature range ------------------------ --------------------------------------------------- ------ -65 ~ 150 sop-8/sop-7 package thermal resistance ----------- --------------------------------------------------- ------ 160 /w dip-8 package thermal resistance ----------------- --------------------------------------------------- ---------- 100 /w power dissipation (sop-8, at ambient temperature = 85 ) ----------------------------------------------- 400 mw power dissipation (dip-8, at ambient temperature = 85 ) ------------------------------------------------- 650mw lead temperature (sop-8 & dip-8, soldering, 10sec) ------------------------------------------------- ------ 230 lead temperature (all pb free packages, soldering, 10sec) ------------------------------------------- ----- 260 esd voltage protection, human body model (except hv pin) -------------------------------------------- ---- 3kv esd voltage protection, machine model ------------ --------------------------------------------------- ------------- 300v
2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 4 preliminary gr8875 series rlt + - + - 3.5v 1.05v vbias 100ua ovp otp driver stage latch protect re-start protect leb s q r + ++ + - -- - + - vcs-h/l ocp vbias osc slope compensation cs pg en comp soft start internal bias & vref vcc ok all blocks 17v/9v uvlo vcc 28v 3.5v olp + - pg + - vref ok vcc vcc ovp rtl latch gnd olp rtl latch vcc ovp olp for 8875l vcc ovp for 8875r hv hv start-up vcc brown in/out detect vcs-h/l adiustment bleed function detect bno bno out nc comp vcs-h/l block diagram
2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 5 preliminary gr8875 series electrical characteristics (t a = + 25 , v cc = 15.0v, unless otherwise specified) parameter pin min typ max unit high-voltage supply (hv pin) high-voltage current source (v dc =370 ,r=125k vcc = 0v) 8 2.96 4 ma off-state leakage current 8 36 ua brownout threshold (see below equation 1) dc source r=125 k 92 102 112 v brownin threshold (see below equation 2) dc source r=125 k 104 114 124 v pwm turn-off debounce time- normal operation 75 ms supply voltage startup current 6 30 ua operating current (with 1nf load on out pin), vcomp = 0v 6 0.8 ma operating current (with 1nf load on out pin), vcomp = 2.5v 6 2.2 ma operating current (with 1nf load on out pin), prote ction tripped (olp, ovp) 6 0.5 ma uvlo (off) 6 8 9 10 v uvlo (on) 6 16 17 18 v ovp on vcc pin 6 27 28 29 v voltage feedback open loop voltage, comp pin open 2 4.5 v delay time of comp pin open loop protection 2 50 ms current sensing current limit @ low line(vac=86v) vdc=122 series rh v=125k to hv vcs-h 3 0.80 0.85 0.90 v current limit @ high line(vac=259v)vdc=366 series r hv=125k to hv vcs-l 3 0.7 v leading-edge blanking time without t pd 3 250 ns input impedance 3 1 m delay to output 3 100 ns oscillator normal pwm frequency 60 65 70 khz frequency jitter range 6 % khz green mode frequency 22 khz temp. stability (- 40c ~ 105c) 5 % voltage stability (vcc = 11v ~ 25v) 2 % gate driver output output low level, vcc = 15v, i o = 20ma 5 1 v output high level, vcc = 15v, i o =20ma 5 8 v
2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 6 preliminary gr8875 series 2 ] 1 1 9 0[ ) ( k k rhv v . rms on vac + = ? rising time, load capacitance = 1000pf 5 150 ns falling time, load capacitance = 1000pf 5 50 ns vgate-clamp (vcc = 25v ) 5 11 13 15 v pwm section maximum duty cycle 70 75 80 % soft start time (freq=65khz) 6 ms *latch pin function option (see below fig.1) over voltage protection threshold voltage 3 3.2 3.5 3.8 v ovp debounce, fs = 65khz 3 100 us over temperature protection threshold voltage 3 0.9 5 1.05 1.15 v otp debounce, fs = 65khz 3 100 us output current from rtl pin 3 92 100 108 ua clamped voltage 3 2.2 v vcc de-latch voltage 3.4 v below equations are for reference only. equation 1: equation 2: 2 1 1 8 0 ) ( ] k k rhv v . [ rms off vac + = ?
2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 7 preliminary gr8875 series application information overview the gr8875 series integrates several functions that are needed in the market. it includes green-mode controller and high-voltage start-up circuit which can save the power loss after startup . high-voltage startup circuit and under-voltage lockout (uvlo) gr8875 series implements a high-voltage startup circuit, during the startup; high-voltage current sources are turned on and provide the start-up current as well as charge the vcc capacitor. when the vcc voltage is higher than the uvlo (on) threshold, the high-voltage current source will be turned off. its leakage current is very low (30ua), which only consumes little power. by using such configuration, the traditional startup resistor is not needed and power consumption will reduce.(refer to fig. 1). fig. 1 a hysteresis uvlo comparator is implemented in gr8875 series, and then the turn-on and turn-off threshold levels are fixed at 17v and 9v respectively. this hysteresis shown in fig.1 ensures that the start-up capacitor will be adequate to supply the chip during start-up. oscillator the maximum duty-cycle of internal oscillator is limited to about 75% to avoid the transformer saturation. green-mode operation when the load decreases to an extent, the frequency of the controller will decrease so as to reduce the system power consumption. the minimum frequency is about 22 khz which is outside the audio range. leading-edge blanking (leb) each time the power mosfet is switched on, a turn-on spike will inevitably occur at the sensor resistor. to avoid fault trigger, a 250ns leading- edge blanking time is built in. conventional rc filtering can therefore be omitted. during this blanking period, the current-limit comparator is disabled and cannot switch off the gate driver. internal slope compensation a built-in slope compensation circuit is constructe d in gr8875 series. when the switch is on, a ramp voltage is added to the sensed voltage across the cs pin, which helps to stabilize the system and prevent sub-harmonic oscillations. gate clamp/soft driving driver is clamped by an internal 13v zener diode. those damages usually come from undesired over-voltage gate signals. under the conditions listed below, the gate output will turn off immediately to protect the power circuit.the gr8875 series also has soft driving function to minimize emi.
2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 8 preliminary gr8875 series soft start during initial power on, the gr8875 series provides soft start function. it effectively suppresses the start up peak current to reduce the power mosfet drain voltage especially at high line. over-load protection (olp) the controller has an over load protection function . an internal circuit detects the comp pin level, when the level is larger than a threshold and the condition lasts more than 50ms, then the gate output will keep low level. the vcc will decrease to uvlo off level and the controller will be reset again. fig.2 shows the waveform of the olp operation. 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 fig. 2 over-voltage protection on vcc-latch mode to prevent power mosfet from being damaged, the gr8875 series is implemented an ovp function on vcc. when the vcc voltage is higher than the ovp threshold voltage, the output gate driver circuit will be shut down immediately to sto p the switching of power mosfet. the vcc pin ovp function is a latch type protection.gr8875 series is working in latch mode as shown in fig. 3. fig. 3 brown-in/brown-out and constant power limited by hv pin unlike previous pwm controllers, the hv pin of gr8875 series isn't only used for startup; it can also detect the ac line voltage to perform brown-in/brown-out function and set the high low line constant power compensation. equations 1 and 2 can be used to calculate out the level of brown-in and brown-out converted to rms value. rtl pin latch off mode the typical application for rtl pin is shown in fig.4. the zener diode is setting as external ovp protection and the ntc thermistor is setting as external otp protection. in the rtl pin, there are two comparators for latch-off mode protection. while the voltage on this pin is higher than 3.5v o r lower than 1.05v, the gr8875 series will shut down after the de-bounce time 100us. and the gr8875 series will never auto recovery, unless the vcc pin voltage is down to reset level as same as shown in fig. 3
2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 9 preliminary gr8875 series fig.4 application circuit rtl
2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 10 preliminary gr8875 series package information sop-8 sop-8 millimeters inches symbol min. max. min. max. a 1.75 0.069 a1 0.10 0.25 0.004 0.010 a2 1.25 0.049 b 0.31 0.51 0.012 0.020 c 0.17 0.25 0.007 0.010 d 4.80 5.00 0.189 0.197 e 5.80 6.20 0.228 0.244 e1 3.80 4.00 0.150 0.157 e 1.27 bsc 0.050 bsc h 0.25 0.50 0.010 0.020 l 0.40 1.27 0.016 0.050 0 o 8 o 0 o 8 o note: 1. followed from jedec ms-012 aa. 2. dimension ?d? does not include mold flash, protrusions or gate burrs. mold flash, protrusion o r gate burrs shall not exceed 6 mil per side. 3. dimension ?e1? does not include inter-lead flash or protrusions. inter-lead flash and protrusi ons shall not exceed 10 mil per side.
2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 11 preliminary gr8875 series package information sop-7 sop-7 millimeters inches symbol min. max. min. max. a 1.75 0.069 a1 0.10 0.25 0.004 0.010 a2 1.25 0.049 b 0.31 0.51 0.012 0.020 c 0.17 0.25 0.007 0.010 d 4.80 5.00 0.189 0.197 e 5.80 6.20 0.228 0.244 e1 3.80 4.00 0.150 0.157 e 1.27 bsc 0.050 bsc e1 2.54 bsc 0.101 bsc h 0.25 0.50 0.010 0.020 l 0.40 1.27 0.016 0.050 0 o 8 o 0 o 8 o note: 1. dimension ?d? does not include mold flash, protrusions or gate burrs. mold flash, protrusion or gate burrs shall not exceed 6 mil per side. 2. dimension ?e? does not include inter-lead f lash or protrusions. inter-lead flash and protrusio ns shall not exceed 10 mil per side.
2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 12 preliminary gr8875 series package information dip-8 dip-8 millimeters inches symbol 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 protrusions sha ll not exceed 10 mil.
2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 13 preliminary gr8875 series carrier tape & reel dimensions sop- 8/sop-7 application a h t1 c d d w e1 f 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 sop-8/sop7 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/sop-7 12 - 2500
2011.12 ver. f copyright grenergy opto, inc. www.gr energy-ic.com 14 preliminary gr8875 series taping direction information sop-8/ sop-7 ___________________________________________________ _____________________ 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 dis continue any product or service without notice. cus tomers should obtain the latest relevant information before placing orders a nd should verify that such information is current a nd complete. direction of feed direction of feed

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