ts19702 high power factor corrector led driver 1/9 version: a12 sot - 26 description the ts19702 is a highly-integrated, low startup cur rent, average current mode, one cycle control pfc a nd fixed switching frequency pwm controller. these functions enable the led driver to easily meet the accuracy average led current and high power factor requireme nts. the integrated functions also include the led short protection, open protection, and internal over temp erature protection. the comp pin controls the duty by connected an rc compensation network to ground and forming the closed loop feedback control. to protec t the external power mosfet from being damaged by supply over voltage, the ts19702 output pin voltage is clamped to about 15v. features high power factor by one cycle control accuracy constant current low bom cost linear dimming on dim pin average current / fixed frequency control gate output voltage clamp led open protection (ovp) led short protection (scp) over current protection (ocp) internal otp protection 300ma driving capability for output pin application e27, t5, t8 led lighting led lighting applications ordering information part no. package packing ts19702cx6 rfg sot-26 3kpcs / 7 reel note: g denote for halogen free product absolute maximum rating (ta = 25 o c unless otherwise noted) parameter symbol limit unit supply voltage v cc 30 v compensation voltage v comp -0.3 ~ 7 v dimming pin v dim -0.3 ~ 7 v current sense pin v cs -0.3 ~ 7 v output pin v out 15 v power dissipation @ t a =85oc p d 250 mw operating ambient temperature t opr -20 ~ +85 o c junction temperature t j +150 o c storage temperature range t stg -65 ~ +150 o c thermal resistance - junction to ambient r ? ja 250 o c/w esd voltage protection hbm 2 kv mm 200 v pin definition : 1. vcc 2. ground 3. output 4. dimming 5. compensation 6. current sense
ts19702 high power factor corrector led driver 2/9 version: a12 electrical characteristics (v cc =15 , t a =25 , unless otherwise specified.) parameter symbol min. typ. max. unit supply voltage startup current (vcc=uvlo on - 1v) i start -- 8 15 ua operating current (with 1nf load on out pin), vcomp = 2.5v i opr -- 2 3 ma operating current (with 1nf load on out pin), protection tripped (ocp, ovp, scp, otp) i opr -- 0.7 1 ma uvlo(off) uvlo off 7 8 9 v uvlo(on) uvlo on 14 15 16 v ovp level on vcc pin v ovp 26.5 28 29.5 v ovp de-bounce time t ovp -- 40 -- us voltage feedback feedback reference voltage v fb 0.196 0.200 0.204 v tran-conductance -- 120 -- us output sink current i sink -- 12 -- ua output source current i source -- 12 -- ua current sensing input over voltage protection v in - protect 0.7 0.80 0.9 v open loop voltage, cs pin open v cs -- 5 -- v leading-edge blanking time t le -- 410 -- ns delay to output t o - delay -- 100 220 ns switching frequency switching frequency f sw 42 45 48 khz maximum duty d (max) 90 -- -- % frequency jitter range -- +/-4 -- % temp. stability (-40c ~ 125c) temp stb -- -- 6 % voltage stability (vcc = 11v~25v) v stb -- -- 1 % gate driver output rising time, load capacitance =1000pf t rising -- 160 320 ns falling time, load capacitance =1000pf t falling -- 80 160 ns vgate-clamp (vcc=25v) v gate -- 13.5 15 v dim input section saturation threshold voltage sat th 3.0 -- -- v linear dimming range dim 0.3 -- 3.0 v led current off threshold voltage ioff th -- -- 0.3 v current source cs 290 300 310 ua otp section otp trip point otp tp 140 150 160 o c otp release point otp r p 120 130 140 o c otp threshold level otp t h -- 20 -- o c otp de-bounce time otp dbt 40 80 120 us note 1: ocp, scp, otp: auto recovery type note 2: ovp, auto recovery type (latch off type optional)
ts19702 high power factor corrector led driver 3/9 version: a12 function block pin description pin no. name function 1 vcc power supply pin 2 gnd ground pin 3 out the output driver for driving the external mo sfet 4 dim dimming control pin by input a dc voltage 5 comp feedback compensation network 6 cs current sense pin, connect to sense the mosfet current
ts19702 high power factor corrector led driver 4/9 version: a12 application circuit application information start-up current the typical start-up current is around 8ua. very lo w start-up current allows the pwm controller to inc rease the value of start-up resistor and then reduce the powe r dissipation on it. uvlo (under voltage lockout) a hysteresis uvlo comparator is implemented in ts19 702, then the turn-on and turn-off thresholds level are fixed at 15v and 8v respectively. this hysteresis shown i n fig.11 ensures that the start-up capacitor will b e adequate to supply the chip during start-up. for quickly startu p the led driver, the start-up resistor should be m atched with the startup capacitor. due to the low uvlo on level, so the turn-on delay time will also never greater tha n the general pwm ic. oscillator the maximum duty-cycle of internal oscillator is up to 90% for driving high led voltage string. the fr equency of the oscillator is fixed to 45khz by internal setting. leb (leading-edge blanking) each time the power mosfet is switched on, a turn-o n spike will inevitably occur at the sense resistor . to avoid fault trigger, a 410ns leading-edge blanking time i s built in. conventional rc filtering can therefore be omitted. during this blanking period, the current-limit comp arator is disabled and can not switch off the gate driver.
ts19702 high power factor corrector led driver 5/9 version: a12 application information (continue) ocp (over current protection) the ts19702 has an over current protection function on cs pin. an internal circuit detects the current level, when the current is larger than a threshold level, the g ate output will keep on low level. then vcc decreas es below uvlo off level, the controller resets again. ovp (over voltage protection) on vcc to prevent the led driver from being damaged, the t s19702 is implemented an ovp function on vcc. when the vcc voltage is higher than the ovp threshold voltag e 28v, the output gate driver circuit will be shut down immediately to stop the switching of power mosfet. the vcc pin ovp function is an auto recovery type protection (latch off type optional). if the ovp co ndition happens, the pulses will be stopped and nev er recovery unless the vcc pin voltage is down to the uvlo off level. the ts19702 is working in an auto-recovery m ode as shown in below figure gate clamp/soft driving driver is clamped to 15v by an internal clamping ci rcuit. those damages usually come from undesired ov er-voltage gate signals. under the conditions listed below, th e gate output will turn off immediately to protect the power circuit. the ts19702 also has soft driving function to minim ize emi. over temperature protection/dimming function the typical application for dim pin is shown in abo ve fig. the ntc thermistor is setting as an externa l otp protection. in the dim pin, there is one comparator for latch-off mode protection. while the voltage o n this pin is lower than 0.3v, the ts19702 will shut down. when t he voltage is in the range of 0.3 to 3.0v, the ts19 702 is operating on the linear dimming range. while the vo ltage is higher than 3.0v, the ts19702 is operating on the normal status. it also could let this pin open when the function is not required for the user.
ts19702 high power factor corrector led driver 6/9 version: a12 electrical characteristics curve figure 1. star-up current vs. temperature figure 2. operating current vs. temperature figure 3. uvlo-off vs. temperature figure 4. uvlo-on vs. temperature figure 5. fb v ref vs. temperature figure 6. output sink current vs. temperature
ts19702 high power factor corrector led driver 7/9 version: a12 electrical characteristics curve figure 7. output source current vs. temp. figure 8. input over voltage vs. temperature figure 9. open loop voltage vs. temperature figure 10. switching frequency vs. temp.
ts19702 high power factor corrector led driver 8/9 version: a12 sot-26 mechanical drawing sot-26 dimension dim millimeters inches min typ max min typ max a 0.95 bsc 0.0374 bsc a1 1.9 bsc 0.0748 bsc b 2.60 2.80 3.00 0.1024 0.1102 0.1181 c 1.40 1.50 1.70 0.0551 0.0591 0.0669 d 2.80 2.90 3.10 0.1101 0.1142 0.1220 e 1.00 1.10 1.20 0.0394 0.0433 0.0472 f 0.00 -- 0.10 0.00 0.0039 g 0.35 0.40 0.50 0.0138 0.0157 0.0197 h 0.10 0.15 0.20 0.0039 0.0059 0.0079 i 0.30 -- 0.60 0.0118 -- 0.0236 j 5o -- 10o 5o -- 10o
ts19702 high power factor corrector led driver 9/9 version: a12 notice specifications of the products displayed herein are subject to change without notice. tsc or anyone on its behalf, assumes no responsibility or liability for any erro rs or inaccuracies. information contained herein is intended to provide a product description only. no license, express or implied, to any intellectual property rights is granted by this document. except as provided in tscs terms and co nditions of sale for such products, tsc assumes no liability wh atsoever, and disclaims any express or implied warr anty, relating to sale and/or use of tsc products includi ng liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, cop yright, or other intellectual property right. the products shown herein are not designed for use in medical, life-saving, or life-sustaining applica tions. customers using or selling these products for use i n such applications do so at their own risk and agr ee to fully indemnify tsc for any damages resulting from such i mproper use or sale.
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