ts 1937 2 buck (step - down) wle d driver with external switch 1 / 6 version: a09 sot - 2 5 general description the ts19372 is a continuous mode inductive step - down converter, designed for driving single or multiple series connected leds efficiently from a voltage source higher than the led voltage. the devi ce operates from an input supply between 6v and 40v and provides 300ma output current to drive external n - channel mosfet. ts19372 includes the output switch and a high - side output current sensing circuit, which uses an external resistor to set the nominal average output current. application led flashl ights white led backlightin g white led driving multiple led driving led lighting equipment features wide input voltage range 6v~40v 300ma output current high efficiency up to 92% drives up to 3 (1~3w) leds @ v in 12v drives up to 7 (1~3w) leds @ v in 24v 180khz switching frequency internal pwm filter ordering information part no. package packing ts 1937 2 cx5 rf sot - 2 5 3kpcs / 7 reel block diagram pin definition : 1. sw 2. ground 3. c t 4. i sense 5. v in
ts 1937 2 buck (step - down) wle d driver with external switch 2 / 6 version: a09 absolute maximum rating parameter symbol limit unit input voltage v in 40 v supply voltage (recommended) v in 6 ~ 40 v fb voltage v fb - 0.3 ~ 40 v sw voltage v sw 36 v output sw current i sw 300 ma power dissipation p d 450 mw ambient temperature range t a - 40 to +85 o c junction temperature range t j +150 o c electrical specificatio ns ( ta = 25 o c , unless otherwise noted ) parameter symbol test conditions min typ max units input voltage range v in 6 -- 40 v line regulation reg line -- 1.4 5 mv charge current i charge v in = 6 v~40v -- 30 45 u a discharge current i discharge v in = 6 v~40v 180 230 290 ua switching frequency f osc c t = 100pf, -- 180 -- k hz current limit sense voltage v sense i discharge = i charge 250 -- 350 mv switch v cesat v sat i sw = 300ma -- 1.0 1.3 v supply current i cc v in =6v~40v, c t =1nf - - 3 4 ma collector off - state current i c(off) v ce = 40v 1 100 ua note : low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible
ts 1937 2 buck (step - down) wle d driver with external switch 3 / 6 version: a09 application information pin descriptio n pin function description 1 sw driver switching pin 2 ground ground pin. 3 timing capacitor timing capacitor oscillator input 4 i sense peak current sense input to monitor the voltage drop across an external resistor to limit the peak current through the circuit 5 vin input voltage supply pin inductor selection a 100u h inductor is recommended for most ts 1937 2 applications. although small size and high efficiency are major concerns, the inductor sho uld have low core losses at 180k hz and low dcr (copp er wire resistance). diode selection schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for ts19372 applications. the forward voltage drop of a schottky diode represents the conduction losses in the diode while the diode capacitance represents the switching losses. for diode selection, both forward voltage drop and diode capacitance need to be considered. schottky diodes with higher current ratings usually have lower forward voltage drop and larger diode c apacitance, which can cause significant switching losses at the 180khz switching frequency of the ts19372. capacitor selection for input capacitor and timing capacitor are able to use small ceramic capacitor for most of ts19372 applications. when ac input , to add a 100 f electric capacitor for input capacitor is recommended .
ts 1937 2 buck (step - down) wle d driver with external switch 4 / 6 version: a09 typical application circuit reference design information vin range (v) l (uh) 1w led (series) 1w led (parallel ) current (ma) efficiency (%) 12 68 3 pcs 4 300 88 24 100 7pcs 4 300 92 bill of materials: designation description package manufacture remark led driver ts19372cx5 sot - 25 tsc -- d1 ss34 smb tsc 3a, 40v m1 tsm2318cx sot - 23 tsc n - ch 40v / 3.9a l1 100uh -- generic isat >1.5a r1 0.22 1206 generic -- r2 1k 1206 generic -- cin 10uf 805 generic ceramic c 1 820pf 805 generic ceramic c2 100uf generic tantalum or electrolysis * ac input input voltage vs. efficiency
ts 1937 2 buck (step - down) wle d driver with external switch 5 / 6 version: a09 sot - 25 mechanical drawing marking diagram 7 2 = device code y = ye ar code m = month code ( a =jan, b =feb, c =mar, d =apl, e =may, f =jun, g =jul, h =aug, i =sep, j =oct, k =nov, l =dec) l = lot code sot - 25 dimension millimeters inches dim min max min max. a+a1 0.09 1.25 0.0354 0.0492 b 0.30 0.50 0.0118 0.0197 c 0.09 0.25 0.0035 0.0098 d 2.70 3.10 0.1063 0.1220 e 1.40 1.80 0.0551 0.0709 e 1.90 bsc 0.0748 bsc h 2.40 3.00 0.09449 0.1181 l 0 .35 bsc 0.0138 bsc ? 1 0 10 0 10 s1 0.95 bsc 0.0374 bsc
ts 1937 2 buck (step - down) wle d driver with external switch 6 / 6 version: a09 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 tsc s 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 includi ng liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. the products shown herein are not designed for use in medical, life - saving, or life - s ustaining 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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