z ts 197 3 0 single - stage low thd buck - boost pwm control led driver 1 / 7 version: a15 sot - 26 description the ts197 3 0 is a high power factor, low thd and high accuracy constant current pwm controller. ts197 3 0 achieves high power factor and high efficiency by boundary current mode ( bcm ) . t he l ine and load regulation of led current are within 2 .5 % . ts197 3 0 also provides gate driving voltage clamping , v cc over - voltage protection , and system output open/short circuit protection to increase ic performance. features low thd <1 0 % constant current accuracy within 2 .5 % high p ower f actor >0.9 low bom cost boundary con duction mode control gate output voltage clamp led open protection led short p rotection over current protection (ocp) over thermal protection (otp) application s led lighting down light tube lamp par lamp bulb ordering information part no. package packing ts 19 7 3 0 cx6 rf g sot - 26 3 k pcs / 7 reel note: g denotes for halogen - and antimony - free as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total br + cl) and <1000ppm antimony compounds absolute maximum ratin g s ( note 1 ) parameter symbol range unit power s upply p in v cc 40 v cl v oltage to gnd v cl - 0.3 to 5.5 v out v oltage to gnd v out - 0.3 to 40 v cs v oltage to gnd v cs - 0.3 to 5 .5 v com v oltage to gnd v com - 0.3 to 5.5 v junction temperature range t j - 40 to +150 c storage temperature range t stg - 65 to +150 c lead temperature (soldering 10 s ) t lead 260 c power dissipation @ t a =25 c p d 0.3 w esd rating (human b ody m ode) (note 2 ) hbm 2 kv esd rating (machine m ode) (note 2 ) mm 2 00 v thermal information ( note 3 ) parameter symbol range unit thermal resistance junction to ambient r ja 220 c/w thermal resistance junction to case r j c 106.6 c/w pin definition : 1. v cc 2. gnd 3. out 4 . cl 5. com 6. cs
z ts 197 3 0 single - stage low thd buck - boost pwm control led driver 2 / 7 version: a15 recommend ed operating condition s (note 4) parameter symbol conditions unit power s upply p in v cc 33 v cl v oltage to gnd v cl - 0.3 to 5 v out v oltage to gnd v out - 0.3 to 19 v cs v oltage to gnd v cs - 0.3 to 5 v com v oltage to gnd v com - 0.3 to 5 v operating junction temperature range t j - 40 to + 125 c operating ambient temperature range t opa - 40 to +85 c electrical characteristics ( v cc =18v, t c =25 c, unless otherwise specified. ) parameter symbol condition min typ max unit supply voltage start - up current v cc(st) v cc = v uvlo(on) - 1v -- 45 -- opa with 1nf load on out pin -- 2.1 2.6 ma uvlo(off) v uvlo(off) 7 8 9 v uvlo(on) v uvlo(on) 16 17.5 19 v ovp level on v cc pin v ovp 29 31 33 v voltage feedback feedback reference voltage v fb 0.196 0.2 0.204 v trans conductance g m -- 58 -- o - sink -- 5.8 -- o - source -- 5.8 -- current sensing open loop voltage v olp cs pin open -- 5 -- v leading - edge blanking time t leb -- 400 -- n s delay to output t delay -- 100 -- n s current limit c l l imit voltage v ocp -- 0.3 -- v switching frequency start frequency f str -- 4.5 -- k hz gate driver output rising time t rise load capacitance =1nf -- 90 -- n s falling time t fall load capacitance =1nf -- 40 -- n s vgate - clamp v gate -- 12.5 15 v thermal section (note 5,6 ) thermal shutdown -- 150 -- c thermal shutdown r elease -- 120 -- c
z ts 197 3 0 single - stage low thd buck - boost pwm control led driver 3 / 7 version: a15 electrical characteristics (continue) note : 1. stresses listed as the above absolute maximum ratings may cause permanent damage to the device. these are for stress ratings. functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may remain possibility to affec t device reliability. 2. devices are esd sensitive. handing precaution recommended. 3. thermal resistance is specified with the component mounted on a low effective thermal conductivity test board in free air at t a =25 c. 4. the device is not guaranteed to function outside its operating conditions. 5. guaranteed by design. 6. auto recovery type. function block pin description pin no. name function 1 v cc p ower supply pin for all internal circuit ry . 2 gnd ground r eturn for all internal circuit ry . 3 out gate driver output. 4 cl current limit . 5 com o utput pin of error amplifier . 6 cs input c urrent sense pin. fig. 1 c o m d r i v e r p r o ( v c c _ o v p , o t p ) o u t c s v r e f r s t u v l o / v b g v c c g n d s r l a t c h s r q v r e f v c c _ o v p g m c l o c p s t a r t v r e f s a w t o o t h
z ts 197 3 0 single - stage low thd buck - boost pwm control led driver 4 / 7 version: a15 typical application circuit application information start - up current the typical start - up current is around 45 a. very low start - up current allows the pwm controller to increase the value of start - up resistor and then reduce the power dissipation . u vlo(under voltage lockout) a hysteresis uvlo compar ator is implement ed in ts197 3 0. t he turn - on and turn - off threshold s level are fixed at 17.5v and 8v respective ly. this hysteresi s shown in fig.3 ensures that the start - up capacit or will be adequate to supply the chip du ring start - up. for quick star t - up of the led driver, the start - up resistor should be matched with the start - up capacitor . leb(leading - edge blanking) each time the power mosfet is switched on, a turn - on spike will inevitably occur at the sense resistor. to avoid fault trigger, a 400ns 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. ocp(over cur rent protection) the ts197 3 0 has built - in cycle by cycle over current protection function on cl pin. as the cl pin voltage is larger than v ocp ( 0.3 v), the gate output will be turned off immediately to avoid the driver board to be burned out. fig. 3 fig. 2 a c i n p u t 9 0 v ~ 2 6 4 v m o v f u s e r s v c c o u t t s 1 9 7 3 0 g n d c l c o m c s r c l v c c v u v l o ( o n ) v u v l o ( o f f ) 1 7 . 5 v 8 v
z ts 197 3 0 single - stage low thd buck - boost pwm control led driver 5 / 7 version: a15 application information (continue) ovp (over voltage protection) on v cc to prevent the led driver f rom being damaged, the ts197 3 0 has an implemented ovp function on v cc . when the v cc voltage is higher than the v ovp (31v), the output gate driver circuit will be shut down immediately to stop the switching of power mosfet. the v cc pin ovp function is an auto recovery type protection. if the ovp condition happens, the pulses will be stopped until the v cc pin voltage is down to the uvlo off level. th e ts197 3 0 i s working in an auto - recovery mode as shown in fig. 4. gate clamp driver is clamped to 12.5v by an internal clamping circui t to avoid the gate of mosfet to get damage d . fig. 4 v c c v u v l o ( o n ) v u v l o ( o f f ) o u t v o v p n o n - s w i t c h i n g
z ts 197 3 0 single - stage low thd buck - boost pwm control led driver 6 / 7 version: a15 sot - 26 mechanical drawing unit: millimeters marking diagram s a = device code y = year code m = month code for halogen free product ( o =jan, p =feb, q =mar, r =apl, s =may, t =jun, u =jul, v =aug, w =sep, x =oct, y =nov, z =dec) l = lot code
z ts 197 3 0 single - stage low thd buck - boost pwm control led driver 7 / 7 version: a15 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 sa le 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 infrin gement of any patent, copyright, or other 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 fully indemnify tsc for any damages resulting from such improper use or sale.
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