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2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 1 preliminary GR8210 features input voltage range from 5v to 450v cascode topology for lower switching loss and surge voltage constant off time control line compensation of output current enable pin switch/pwm/linear/sotp dimming function leading-edge blanking frequency modulation in short circuit protection and low output voltage condition over-temperature protection over-current protection sop-8 package, with few external components needed application dc/dc or ac/dc led driver application led t bar lighting cabin light in car both non-isolation and isolation lighting in high input voltage ordering and marking information general description the GR8210 is a high brightness led driver with the cascode topology that patented by grenergy. a high voltage power nmosfet, bv dss is 600v, as the high side device and the power nmosfet inside the GR8210 as the low side device in this cascode topology. a zener voltage, was generated by st pin of the GR8210, turn on the high side device all the time by connected to the gate termin al of the high side device. the source terminal and th e drain terminal of the high side device are connecte d to the drn pin of the GR8210 and the input voltage rail respectively to absorb the very large voltage potential. the current peak value was decided by the sensing resistor in the cs pin, the low side device was turned off by the current peak detection then delay a fixed off time that set by the resisto r in the rt pin of GR8210. there are pwm and liner dimming in the GR8210 to adjust the led brightness. in the abnormal operation, the inner otp function and the external otp by the ntc resistor could protect the ic damage. * switching dimming and system over-temperature dim ming are option functions, see below feature list 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. sop-8 x ? feature code xxxxx ? date code dimming universal high brightness led driver www.datasheet.co.kr datasheet pdf - http://www..net/
2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 2 preliminary GR8210 feature list part name switching dimming otp dimming GR8210 n no no GR8210 d yes no GR8210 t no yes GR8210 z yes yes pin configuration top view pin description pin no. name function 1 drn the drain terminal of the internal nmosfet. 2 vcc the output of the internal regulator. 3 dim the dimming signal input pin. 4 st the anode terminal of the internal zener diode . 5 en the enable input terminal. 6 rt an external resistor located from this pin to gnd t o generate a reference current to fix the off time in the switching operat ion. 7 gnd ground of the circuit. 8 cs current sense voltage input terminal, the led curre nt also flows from this pin to the sense resistor outside. www.datasheet.co.kr datasheet pdf - http://www..net/
2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 3 preliminary GR8210 absolute maximum ratings supply voltage, v cc ------------------------------------------------- --------------------------------------------------- -------- 5.5v drain voltage, v drn ------------------------------------------------- --------------------------------------------------- ---------- 26v dim voltage to gnd, v dim ------------------------------------------------- ------------------------------------------- -0.3v ~ 6v zener voltage, v st ------------------------------------------------- --------------------------------------------------- ----------- 18v en voltage to gnd, v en ------------------------------------------------- ------------------------------------------ -0.3v ~ 6v rt voltage to gnd, v rt ------------------------------------------------- ---------------------------------------------- -0. 3v ~ 6v cs voltage to gnd, v cs ------------------------------------------------- ---------------------------------------------- -0. 3v ~ 6v junction temperature ----------------------------- --------------------------------------------------- ------------------------ 150 c operating ambient temperature -------------------- --------------------------------------------------- -------- -20 c to 85 c storage temperature range ------------------------ --------------------------------------------------- --------- -65 c to 150 c package thermal resistance (sop-8), ja ------------------------------------------------- -------------------------- 160 c/w power dissipation (sop-8, at ambient temperature = 85 c) ---------------------------------------------- ----- 400mw lead temperature (soldering, 10sec) ------------- --------------------------------------------------- ------------------ 260 c esd voltage protection, human body model --------- --------------------------------------------------- -------------- 3.0kv esd voltage protection, machine model ------------ --------------------------------------------------- ----------------- 300v recommended operating conditions * refer to the figure-1. item min. max. unit input voltage, v in * 5 450 v output current, i out * 0.1 0.8 a www.datasheet.co.kr datasheet pdf - http://www..net/
2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 4 preliminary GR8210 block diagram www.datasheet.co.kr datasheet pdf - http://www..net/
2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 5 preliminary GR8210 electrical characteristics (v cc = 5v, t a = 25c, unless otherwise specified.) parameter symbol test conditions min typ max units input voltage input voltage range v in with cascode nmosfet 5 - 450 v vcc section v cc uvlo v uvlo 4.8 5.0 5.2 v v cc uvlo hysteresis v uv lohy 0.65 v operation current i q-op normal operation 0.3 0.5 0.9 ma st section start up voltage in normal operation v st i st = 50 a 12 15 18 v start up current at 156v i st v in = 156v, r st = 2m 50 70.5 90 a current sense section peak current reference voltage v cs1 v in = 312v,. l = 4.7 h, r load = 10 , r cs = 0.3 , asynchronous rectifier: xxxx. 240 250 260 mv leading edge blanking time t leb 500 600 700 ns internal power nmosfet section turned on resistance r ds(on) v cc = 5v, v cs = 0.1v, r drn = 10k from vin to drn. 0.3 0.7 1.0 en section enable threshold v en 0.85 0.9 0.95 v enable function hysteresis v en_hys 0.1 v delay cycles of enable pin t en_d 32 cycles rt section rt threshold voltage v rt v cc = 5v, r rt = 200k . 1.14 1.2 1.26 v constant off time t off v cc = 5v, r rt = 200k . 20.5 22.5 24.5 s constant off time t off_default v cc = 5v, rt to v cc . 9 10 11 s dimming function (ld/pd) pwm dimming input low voltage threshold v ol - - 0.9 v pwm dimming input high voltage threshold v oh 2 - - v linear dimming voltage threshold of 100% current regulation v l_max 100% output current. 0.475 0.5 0.525 v www.datasheet.co.kr datasheet pdf - http://www..net/
2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 6 preliminary GR8210 electrical characteristics (cont.) parameter symbol test conditions min typ max units over temperature protection section otp trip level t otp 150 otp hysteresis t otp_hys 25 system over-temperature dimming section sotp dimming voltage threshold of 100% current regulation v sotp_dim 0.9 1.0 1.1 v sotp protection voltage v sotp_pro 0.45 0.5 0.55 v * switching dimming and system over-temperature dim ming are option functions. www.datasheet.co.kr datasheet pdf - http://www..net/
2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 7 preliminary GR8210 application information operation GR8210 is a cascade topology constant current pwm converter for high brightness led driving. in the figure-1, after the v in ramps up, the v st also ramps up to the target with a delay time. this voltage turns on the m 1 when its level greater than the v th_m1 , then the v cc was created. m 2 was turned on in the on period of the first cycle. the current flows through leds, l 1 , m 1 , m 2 , r s , and back to c in finally. in the end of this period, the m 2 might be to turn off when the v cs reached 0.25v. a fixed off time was followed as the off period of the first cycle. during the off period, the current flows through leds, l 1 and d 1 . a new cycle will start when the fixed off time finish. figure-1 the brief schematic to explain the system operation. start up function the waveforms of figure-2 explain the power on procedure in the GR8210 application circuit. the v st created slowly due to the large time constant, t st , that formed by r st and c st . the reasonable ranges of r st and c st are 1m to 10m and 0.1 f to 1 f respectively. a large resistance could limit the dissipated current under hundreds microampere. these two sets of components value affect the t st in the range of hundreds millisecond to thousands millisecond. the t st order is available defined by the user. the ceramic type of capacitor is suitable for v st regulation. figure-2 the start up waveforms, the voltage designators assigned in figure-1. v cc regulator an internal regulator in the GR8210 could generate a 5v voltage source to supply the operating current for control circuit. the input voltage of the inter nal regulator is the v drn . v cc regulated in the m 2 off period due to the v drn is approximately zero volt in the m 2 on period. therefore, a capacitor, shown in the figure-1, located to the vcc to hold on the v cc during the m 2 on period is necessary. the ceramic type of capacitor is suitable for v cc retaining, a 1 f capacitor could supply the operating current of the control circuit for tens microsecond with a very go od voltage regulation. www.datasheet.co.kr datasheet pdf - http://www..net/
2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 8 preliminary GR8210 peak current detection and line voltage compensation in the figure-3, a current flow through m 2 and r s during the m 2 on period. this current caused the v cs increasing, the comparator pass the peak current information to the control circuit to turn off m 2 while v cs reach to 0.25v. the peak, i pk , current could determine by (1): s pk r 0.25 i = (1) drn regulator inside the GR8210 vcc cs pwm m 2 r s 0.25v comparator control circuit leb line comp. figure-3 the brief schematic to explain the peak current detection and line voltage compensation. in the figure-4, there are large voltage spike in t he turn on edge of v p1 to v p3 . these voltage spikes probably affect the wrong peak current detection. t o prevent this fault, a leb block applied in the GR8210 to generate a fixed period to blank the voltage spike in the cs. the t pg in the figure-4 is the propagation delay of m 2 turned off. the t pg was defined from the v cs reaching 0.25v to m 2 turned off. in thet pg period, the v cs still ramps up from 0.25v due to the m 2 was not turned off yet. for that reason, the end of v cs in the higher v in is greater than the end of v cs in the lower v in . figure-4 the waveforms of v in and v cs to explain the operation of t leb and line voltage compensation. the sketch map explains the generation of v in and the line voltage change of v in due to the limited c in . the different height of v cs means the different i out that shown in the figure-1. the line voltage compensation function was applied in the GR8210 to improve the output current regulation. the v p1 to v p3 in the figure-4 illustrates the compensation results by the line voltage compensation. off time setting GR8210 operates with the peak current sensing and the constant off time. the peak current sensing and the line voltage compensation align the peaks of v cs identically to determine the same i peak that shown in the figure-5. the i valley was determined by the t off . GR8210 provides an off time setting function via connect a resistor from rt to gnd. a simple way is connect rt to vcc directly to use the default off time that the value is approximately 9.3 s. www.datasheet.co.kr datasheet pdf - http://www..net/
2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 9 preliminary GR8210 figure-5 the waveforms of v cs , v l1 and i out that shown in the figure-1. inductor selection and output current setting the (2) and (3) were generated according to the figure-5. they usually used to determine the inductance of the power inductor. k i i out ripple ? = (2) ( ) off ripple d1 led t i v v l ? + = (3) where, the i out is output current that user defined, the k. is the percentage of i out to estimate the worse case and the value usually is range of 20%~40%. beside, the maximum rate current and saturation current of the inductor must greater tha n the i peak that shown in the figure-5. r s selection base on the decision of l, we can calculate the r s by (4). ( ) out s i k 2 0.5 r ? + = (4) input capacitor selection in the figure-1, the c in retained the v in with ac part, the waveform was shown as figure-6. before the input capacitance decision, the users must define the input voltage ripple in the system. a useful ru le can find the valley voltage of the input voltage, a dd 5volts with the summation of the led forward voltage and let the input valley voltage higher tha n this value. figure-6 the waveform of input voltage in the c in . the (5) to (7) could be used to estimate the capacitance of c in that shown in the figure-1. ? ? ? ? ?? ? ? ? ? ? ?? ? ? ?? ? ? ?? ? ? ? ? = ? 90 v ? v 1 sin 1 2 8.333m t in 1 chg (5) chg dis t 8.333m t ? = (6) ? v t i 0.5 c dis out in ? ? = (7) note that, the ? v is the input voltage ripple that defined by the users, the t chg is the charging period and the t dis is the discharging period. in the other considerations, the maximum rate voltage of the c in must be greater than the peak value of v in , the maximum rms current of c in must be greater than half i out . freewheel diode selection two specifications of freewheel diode must be considered, the maximum reverse voltage must be greater than maximum voltage across the diode. the average rectified current also must be greater than i peak that shown in the figure-5. the ultra fast diode is recommended to use as the freewheel diode. www.datasheet.co.kr datasheet pdf - http://www..net/
2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 10 preliminary GR8210 external nmosfet selection the external nmosfet in the figure-1, m 1 , was connected to the drn of the GR8210. most of the input voltage was across the drain and source terminals of m 1 . the specifications of a suitable device are, the continuous current range of 1a to 2 a, the maximum drain to source voltage is 600v and the maximum gate to source voltage is 20v. to choose an external nmosfet with better specifications than above will not be improve the efficiency significantly. zener diode selection users can select an external zener diode to provide the gate voltage for the external nmosfet. the range of the zener voltage is 12v to 15v. pwm dimming operation the users could apply a digital duty modulation signal into dim pin to use the pwm dimming. the i out , shown in the figure-1, would regulate in the high state of pwm signal and stop regulating in the low state of pwm signal. linear dimming operation an analog dimming function was also applied in the GR8210. the users could apply an analog voltage that range from 0v to 0.5v into dim pin to adjust t he led brightness. the dim pin was a multi-function input. the GR8210 detects which dimming manner was applied after power on procedure. therefore, the GR8210 can not alternate between pwm dimming and linear dimming during the operation. switching dimming operation the GR8210 gives a very convenient switching dimming function for users without extra components and control signal input. the users could turn off the input power, shown as the v in in the figure-7, right after that turn on the power ag ain during 1.5sec to dimming the brightness by the power switch. there are four current levels in the switching dimming operation. the level_1 to level_4 are determined by the v cs_sw1 to v cs_sw4 respectively. figure-7 the waveforms of v in , i out an i out _ avg that shown in figure-1. these waveforms illustrate the switching dimming procedure and behavior. en function (brown in/out operation) the en pin provides a control function to the users . the users can turn off the operation by apply a ttl logic signal via the en pin. beside, en pin can also used as a brown in/out function to make sure the operation under the suitable input voltage. in the lower input voltage, the GR8210 could stop operation via the brown in detection. the GR8210 detects the input voltage information by a voltage divider as shown in the figure-8. brn brn2 i 0.9 r = (8) brn2 brn2 in_brn brn1 r 0.9 r v r ? ? = (9) (8) and (9) can be used to estimate the resistance of the r brn1 and r brn2 . note that, the i brn is the acceptable current by the users, the v in_brn is the brown in voltage threshold set by the users. www.datasheet.co.kr datasheet pdf - http://www..net/
2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 11 preliminary GR8210 figure-8 the sketch map of brown in/out setting. over temperature protection (ovp) the GR8210 provides an inner over temperature protection function to prevent the system damage. in some abnormal situation, a high temperature could trip the otp to latch off the GR8210. the users should power on again to reset this latch. short circuit protection in the figure-9, the i out runs away due to the i valley always higher than i peak in the short circuit conditions. to prevent this situation, the GR8210 could increase the t off by product a multiplier to control the i valley stay below i peak . the multiplier might be 2, 4 and 8 that decided by the GR8210 control scheme. figure-9 the sketch waveforms to illustrate the short circuits protection. pcb layout consideration figure-10 shows the pcb layout considerations of GR8210. these guidelines detailed below. (1) locate the u 1 , r s , c in , d 5 , l 1 and m 1 closely each other to reduce the current loop of on period and off period. (2) locate the r s , c 1 and c st close to the GR8210 as possibly. (3) locate the m 1 to the GR8210 close as possibly to reduce the distance between the source terminal of m 1 and pin1 of u 1 . d l r led led c c z r bottom layer top layer on period current loop off period current loop GR8210 c in r s c led gnd gnd gnd v in d 5 l 1 m 1 u 1 c 1 c st figure-10 the pcb layout sketch map shown the layout considerations and the relative locations of the key components. www.datasheet.co.kr datasheet pdf - http://www..net/
2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 12 preliminary GR8210 typical application circuit gnd vcc figure-11 110vac or 220vac input voltage, default o ff time, 24pcs leds light bar, 350ma application ci rcuit. www.datasheet.co.kr datasheet pdf - http://www..net/
2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 13 preliminary GR8210 package information 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 www.datasheet.co.kr datasheet pdf - http://www..net/
2009.07 ver. b copyright grenergy opto, inc. www.gr energy-ic.com 14 preliminary GR8210 carrier tape & reel dimensions sop- 8 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 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. www.datasheet.co.kr datasheet pdf - http://www..net/

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