rev. 1.11 1 august 17, 2016 rev. 1.00 pb august 17, 2016 HT7L5600 primary side regulation off line led driver with active pfc features ? small outline sot23-6 package ? primary-side current sensing and regulation with - out an opto-coupler ? wide ac i nput range C from 85vac to 265vac ? high power factor of >0.9 without additional circuitry ? accurate c onstant current (< 3%) ? low start-up c urrent wh ich reduce s p ower d issipation ? full protection functions for enhanced safety: ? gate driver o utput v oltage clamp ? vcc over voltage protection C vcc ovp ? vcc under-voltage lockout with hysteresis C vcc uvlo ? output led s tring o ver c urrent protection ? output led s tring short / open p rotection ? on-chip over temperature protection C otp applications ? general illumination ? e26/27, t5/t8 led lamp ? other led lighting applications general description the HT7L5600 is a single-stage, isolated, primary - side of fline le d li ghting control ler that achi eves a high power factor . power control is implemented by controlling an external m osfet and accurate led constant c urrent regulati on from t he p rimary - side information. this can signifcantly simplify the led lighting system design by eliminating the secondary - side feedback components and the normally required opto- coupler. the extremely low start-up current and quiescent c urrent re duces t he t otal powe r c onsump - tion to provide a high effciency solution for lighting applications. the HT7L5600 provides several protection functions , which include vcc under v oltage lockout (uvlo), over current protection (ocp) , output led string open protection , output led string short protection , vcc over v oltage protection (ovp) and leading- edge blanking ( leb ) for current sensing. additionally and to ensure system reliability , the device includes a fully integrated thermal protection function. t o protect the external power mosfet from being damaged by a n over voltage , the d evice dr v p in v oltage i s clamped to about 1 6v . the high level of functional integra tion minimi ses the external component count giving major advantages in terms of cost and circuit board area. t he device is supplied in a sot23-6 package. application circuit s acin v out+ v out- ht 7l 5600 comp gnd cs zcd vcc drv
rev. 1.11 2 august 17, 2016 HT7L5600 block diagram 0.3v cs comp zcd starter min off time drv ea pwm generator ocp zcd comparator uvlo vcc reference & bias zcd ovp otp logic control driver leb gnd vcc ovp s&h pin assignment top view sot 23 -6 l 5600 6 5 4 321 cs gnd comp drv vcc zcd
rev. 1.11 3 august 17, 2016 HT7L5600 pin description pin no. symbol description 1 comp loop compensation pin. a capacitor should be placed between comp and gnd. 2 gnd ground pin 3 cs current sense pin. a resistor is connected to sense the mosfet current. 4 drv gate drive output for driving external power mosfet s 5 vcc power supply pin 6 zcd connected to a resistor divider from the auxiliary winding to sense the output voltage. absolute maximum ratings parameter range vcc supply voltage -0.3v~27v input voltage to cs pin -0.3v~6v o utput voltage at comp pin -0.3v~6v maximum current at zcd pin 3ma (source), 3ma (sink) maximum operating junction temperature 150c storage temperature range -55c~150c recommended operating ranges parameter range vcc supply voltage 10v~20v operating junction temperature -40c~125c
rev. 1.11 4 august 17, 2016 HT7L5600 electrical characteristics (v cc =12 v, ta=25c) symbol parameter test condition min typ max unit power supply (vcc pin) vcc on uvlo on 18 v vcc off uvlo off 7.5 v vcc hys uvlo hysteresis 10 v v ovp1 vcc ovp trip point 21.5 24 26.5 v i start start-up current before turn-on, @v cc =uvlo on - 1v 10 20 a i q quiescent current no switching 0.7 1 ma i cc operating current @70khz, co=1nf 1.3 2 ma error amplifer v fb feedback reference voltage t a=25c 291 300 309 mv current sense comparator t leb leading edge blanking time 400 ns v ocp current limit threshold 1.55 v v scp zcd pin short circuit protection threshold 0.4 v z ero current detector v zcdh upper clamp voltage i zcd =2.5ma 6.1 v v zcdl lower clamp voltage i zcd = -2.5ma -0.7 v v zcda positive-going edge 150 mv v zcdt negative-going edge 50 mv v ovp2 zcd pin ovp level 2.88 3.2 3.52 v t b_ovp ovp detection blanking time 1 s starter t start start timer period 40 s t off minimum off time 6.4 s over t emperature protection otp over temperature trip point 150 c gate driver t r rising t ime c load =1nf, 10%~90% 50 ns t f falling time c load =1nf, 10%~90% 50 ns i source source current 300 ma i sink sink current 300 ma v g_clamp gate clamp voltage @ v cc = 20v 16 19.5 v
rev. 1.11 5 august 17, 2016 HT7L5600 t ypical performance characteristics 4 6 8 10 12 14 16 -40 -20 0 20 40 60 80 100 120 temperature ( ) start up current (ua) figure 1. start-up current vs. temperature 17 17.4 17.8 18.2 18.6 19 -40 -20 0 20 40 60 80 100 120 temperature ( ) uvlo_on (v) figure 3. uvlo_on vs. temperature 22 22.5 23 23.5 24 24.5 25 25.5 26 -40 -20 0 20 40 60 80 100 120 temperature ( ) vcc_ovp (v) figure 5. vcc_ovp vs. temperature 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 -40 -20 0 20 40 60 80 100 120 temperature ( ) vfb (mv) figure 7. vfb vs. temperature 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 -40 -20 0 20 40 60 80 100 120 temperature ( ) operating current (ma) figure 2. operation current vs. temperature 6.4 6.8 7.2 7.6 8 8.4 -40 -20 0 20 40 60 80 100 120 temperature ( ) uvlo_off (v) figure 4. uvlo_off vs. temperature 2.9 3 3.1 3.2 3.3 3.4 3.5 -40 -20 0 20 40 60 80 100 120 temperature ( ) zcd_ovp (v) figure 6. zcd_ovp vs. temperature figure 8. iout vs. led series
rev. 1.11 6 august 17, 2016 HT7L5600 figure 9. effciency vs. ac voltage figure 10.power factor(pf) vs. ac voltage functional description the h t7l 5600 is a single - stage primary-side offine led controller designed for isolated led lighting applications. the device can achieve high p ower factor val ues and l ow thd values without resorti ng to additional c ircuit s a nd c an a lso ge nerate hi gh accuracy l ed d rive c urrents wi th v ery f ew e xternal components. start-up current a very low start-up current , i start , allows users to select a lar ger start-up resistor value which reduce s power dissipation. power factor correction high powe r fa ctor i s a chieved by c onstant on-t ime operation. to i mplement c onstant o n-time c ontrol , a 0.47 f capacitor is placed betw een t he com p pin and ground . constant current control the HT7L5600 accurately regulates the led current by sensing the primary-side information. the led current can be set as follow s: s p cs fb out n n r v i 2 1 where n p is the primary winding and n s is the secondary winding; v fb (=300mv) is the internal voltage re ference a nd r cs i s t he e xternal c urrent sensing resistor. vcc under voltage lockout C uvlo the device has an integrated u vlo function w hich includes 10v of hysteresis. the pwm controller will switch on when the vcc voltage exceeds 18v . it will switch o ff wh en t he vcc voltage i s l ess t han 7.5 v. the h ysteresis characteris tics will ensure that the device can be powered by an input capacitor during start-up. w hen t he out put vol tage i ncreases t o a c er - tain value after start -up , vcc will be char ged by an output through an auxiliary winding. boundary conduction mode C bcm the p ower mosfet is turned on by inductor current zero-crossing detection. the current zero-crossing can be detected by a zcd voltage . when the inductor current is at t he zero c rossing poi nt , the voltage on t he z cd pin will drop rapidly . the HT7L5600 then detects the fa lling e dge a nd t urns on t he powe r mosfe t. the b oundary conduction mode provides l ow turn-on switching losses and high conversion effciency. leading-edge blanking C leb on cs at each turn on time of the external power mosfet , a spike will inevitably be generated at the sense resistor . to prevent fault y t rigger ing , a 400ns l eading-edge blank t ime will b e generated . dur ing t his b lanking period, t he c urrent-limit c omparator i s di sabled a nd will therefore not be able to switch off the gate driver. gate driver c lamp the dr v p in i s c onnected t o the gate of e xternal mosfet to switch i t on a nd of f . to prot ect t he external power mosfet from being over - stressed, the gate driver output is clamped to 1 6v .
rev. 1.11 7 august 17, 2016 HT7L5600 over voltage protection C ovp on vcc in order to prevent pwm controller damage, the device i ncludes an ovp funct ion for vcc. should t he vcc voltage exceed the ovp threshold voltage of 24 v, the pwm controller will cease operat ion immediately . when the vcc voltage falls below the uvlo of f level, the controller will reset. led open protection C zcd ovp the zcd pin voltage is set by a resistor divider r top (top resistor), r bot (bottom resistor) and an auxiliary winding due to the coupling polarity between the auxiliary winding and the secondary winding of the transformer. o nce t he z cd vol tage e xceeds 3.2v after a bl anking t ime a bout 1us t o a llow t he l eakage inductance ringing to be fully damped, zcd ovp is triggered . the device w ill then stop s witching but it can be reset by re-starting the voltage on the vcc pin. t he ovp voltage can be adjusted by the equation: d a s bot top ovpout v n n r r v ++= )1(2.3 _ where n s is the secondary winding, n a is the auxiliary winding and v d is the forward bias voltage of the secondary diode. over current protection C ocp the ht 7l 5600 i ncludes a c s p in o ver c urrent p rotection function. an internal circuit detects the current level and should the current be lar ger than the o ver c urrent p rotection threshold level , the gate output will then be fxed to a low level. led short protection C scp the output voltage drops when a number of leds in a string are shorted resulting in a voltage drop on vcc. once vcc falls below 7.5 v, the device will cease operation . u nder such s ituation s , the s tart-up operation will rechar ge the vcc pin through the start- up resistor and the device will enter the uvlo hiccup mode. thermal protection a thermal protection feature is included to protect the device from excessive heat damage. when the junction temperature exceeds a threshold of 150c, the thermal protection function will t urn o ff t he dr v t erminal immediately. when the vcc decreases below the uvlo off level, the controller will reset.
rev. 1.11 8 august 17, 2016 HT7L5600 package information note that the package information provided here is for consultation purposes only. as this information may be updated at regular intervals users are reminded to consult the holtek website for the latest version of the package/ carton information . additional supplementary information with regard to packaging is listed below. click on the relevant section to be transferred to the relevant website page. ? package information (include outline dimensions, product tape and reel specifcations) ? the operation instruction of packing materials ? carton information
rev. 1.11 9 august 17, 2016 HT7L5600 6-pin sot23-6 outline dimensions h symbol dimensions in inch min. nom. max. a 0.057 a1 0.006 a2 0.035 0.045 0.051 b 0.012 0.020 c 0.003 0.009 d 0.114 bsc e 0.063 bsc e 0.037 bsc e1 0.075 bsc h 0.110 bsc l1 0.024 bsc 0 8 symbol dimensions in mm min. nom. max. a 1.45 a1 0.15 a2 0.90 1.15 1.30 b 0.30 0.50 c 0.08 0.22 d 2.90 bsc e 1.60 bsc e 0.95 bsc e1 1.90 bsc h 2.80 bsc l1 0.60 bsc 0 8
rev. 1.11 10 august 17, 2016 HT7L5600 copyright ? 2015 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek assumes no responsibility arising from the use of the specifcations described. the applications mentioned herein are used solely for the purpose of illustration and holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. holtek's products are not authorized for use as critical components in life support devices or systems. holtek reserves the right to alter its products without prior notifcation. for the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
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