ts 19705 single - stage pfc primary - side - regulation led driver 1 / 7 version: b 14 sot - 26 description TS19705 is a primary - side - regulation with fly - back control ic with active power factor correction function for led lighting application s . the ic achieves high power factor and low total harmonic distortion (thd) operation by boundary conduction mode (bcm) . the line and load regulation of led current is about < 3 % because of particular control method. TS19705 also provide s gate driving voltage clamping, v cc overvoltage protection and system output open/ short circuit protection to increase ic performance. features constant current accuracy w i thi n < 3 % primary - side f eedback c ontrol application voltage range : 90 ~ 264v ac transition - m ode pfc o perating built - in active po wer factor correction con stant output current control good line and load regulation open - led protection on dmg pin over - voltage protection on v cc pin short - led protection cycle by cycle over c urrent protection on cs pin over - temperature protection gate driving voltage clamping application s e27 , t5, t8 led l ighting led bulb led down light led lighting applications ordering information part no. package packing ts 19 70 5 cx6 rf g sot - 26 3 k pcs / 7 reel note: g denote for halogen free product absolute maximum rating s ( t a = 25 o c unless otherwise noted ) (note 1 ) parameter symbol range unit power supply pin v cc 40 v dmg voltage to gnd v dmg - 0.3 to 40 v out voltage to gnd v out - 0.3 to 40 v cs voltage to gnd v cs - 0.3 to 5.5 v com voltage to gnd v com - 0.3 to 5 v junction temperature range t j - 40 to +150 c storage temperature range t stg - 65 to +150 c power dissipation @t a =25 c p d 0.3 w esd rating (human body m ode l ) esd 2 kv thermal information (note 2) parameter symbol range unit thermal resistance junction to ambient r ja 220 c/w thermal resistance junction to case r jc 106.6 c/w pin definition : 1. compensation 2. ground 3. current sense 4. output 5. v cc 6. dmg
ts 19705 single - stage pfc primary - side - regulation led driver 2 / 7 version: b 14 recommend ed operating condition s parameter symbol conditions unit power supply pin v cc 38 v dmg voltage to gnd v dmg - 0.3 to 38 v out voltage to gnd v out - 0.3 to 38 v cs voltage to gnd v cs - 0.3 to 5 v com vol tage to gnd v com - 0.3 to v cc v operating j unction t emperature r ang e t j - 40 to + 125 c operating a mbient t emperature r ang e t opa - 40 to +85 c electrical characteristics (v cc =15 , t a = 25 , unless otherwise specified ) parameter symbol condition min typ max unit turn - on voltage v cc_on 17 18 19 v turn - off voltage v cc_off 8.5 9.5 10 v quiescent current 1 i q1 v cc =17v, @ v cc off -- 30 50 a quiescent current 2 i q2 start - up @ 4.5khz -- 600 800 a operation supply current i cc -- 2.5 3..0 ma p rotection vcc voltage protection v ovpa 31 32 3 4 v output voltage protection v ovps 10 10 .5 11 v cs limit voltage v ocp 1.15 1.25 1.35 v short circuit protection v scp guaranteed by design -- 3 -- v o scillator start - up timer t str -- 220 -- s g m amplifier transconductance g m -- 60 -- a/v s ink current i comp_ sink -- 20 -- a source current i comp_sou -- 20 -- a d river dropout voltage v oh v cc =33v, i o = 10ma -- 1.2 1.5 v v ol v cc =33v, i o = - 10ma -- 0.12 -- v rising time t r v cc =20v, c o =1nf -- 40 -- ns falling time t f v cc =20v, c o =1nf -- 80 -- ns output clamp voltage v o_clamp -- -- 19 v leading e d ge blanking time leb t -- 0.5 -- ns note : 1. stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. 2 . thermal resistance is specified with the component mounted on a low effective thermal conductivity test board in free air at t a =25 c .
ts 19705 single - stage pfc primary - side - regulation led driver 3 / 7 version: b 14 function block pin description pin no. name function 1 com o utput pin of error amplifier . 2 gnd ground return for all internal circuitry. 3 cs input c urrent sense pin. 4 out power mos output pin. 5 v cc p ower supply pin for all internal circuit ry . 6 dmg zero current demagnetization sensing. typical application circuit
ts 19705 single - stage pfc primary - side - regulation led driver 4 / 7 version: b 14 application information function description the TS19705 is a constant current fly - back controller with primary side control and pfc function for led lighting applications. the controller is boundary conduction mode ( b cm ) operation with constant on time based regulator design to achieve high power factor performance. the TS19705 ha s built - in v cc over voltage protection, open led protection, short led protection, over temperature protection, primary side curr ent limit and g ate clamp functions . the avera ge output current can be express ed as below. where : ? i o_avg is the avera ge output current ? n p is the primary - side turn ratio ? n s is the secondary - side turn ratio ? r s is the sensing resistor connected be tween the mosfet source and the gnd pin detail compensation this is the output of the g m amplifier . connect with a suitable rc network to ground. ground gnd is the reference node of internal circuit. current sense mos fet current signal sensing for m ultiplication and current limit setting function . where : ? i cs is the input current sence ? r s is the sensing resistor connected between the mosfet source and gnd o utput gate drive for external mosfet switch and is built - in g ate clamp function. v cc power supply for the controller during normal operation. the controller will start up when v cc reaches 18v (typical) and will shut - down when v cc voltage is below 9.5v (typic al). a decoupling capacitor should be connected between the v cc and gnd pin as close as possible. the TS19705 perform s v cc over voltage protection though v cc pin. once v cc pin exceed s in 32v, TS19705 turns off and latch s out the mosfet switcher until v cc goes below v cc_off .
ts 19705 single - stage pfc primary - side - regulation led driver 5 / 7 version: b 14 application information (continue) dmg the output voltage is reflected by the auxiliary winding (n aux ) voltage of flyback transformer, the dmg pin can sense output information to depart from start up voltage (v o_str ) and protection voltage (v o_ovp ). when dmg sense voltage under v o_str , the circuit will work on short circuit protection, f str =1/ t str . when dmg sense voltage over v o_ovp , the circuit will work on over voltage protection, it will latch s out until v cc goes below v cc_off . where : ? v out_ovp is the outp ut - over - voltage protection point ? v ovps is the over voltage protection signal ? v o_str is the start - up timer ? n aux is the number of auxiliary - winding turns ? n s ec is the number of secondary - winding turns r 1 r 2 n a u x l a r v c c v c c d m g
ts 19705 single - stage pfc primary - side - regulation led driver 6 / 7 version: b 14 sot - 26 mechanical drawing unit: millimeters marking diagram r s = device code l = lot code a~z y = year code ( d =2014 , e =2015 , f =2016 , g =2017 , h =2018 , j =2019 , k =2020) w = week code a~z = wk1~wk26 a ~ z = wk27~wk52
ts 19705 single - stage pfc primary - side - regulation led driver 7 / 7 version: b 14 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 errors 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 conditions of sale for such products, tsc assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of tsc products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or o ther intellectual property right. the products shown herein are not designed for use in medical, life - saving, or life - sustaining applications. customers using or selling these products for use in such applications do so at their own risk and agree to full y indemnify tsc for any damages resulting from such improper use or sale.
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