ts19372 buck (step-down) wled driver with external switch 1/9 version: d09 sot - 2 5 general description the ts19372 is a continuous mode inductive step-dow n converter, designed for driving single or multipl e series connected leds efficiently from a voltage source hi gher than the led voltage. the device 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 exter nal resistor to set the nominal average output current. features wide input voltage range 6v~40v output current optional by mosfet 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 application led flashlights white led backlighting white led driving multiple led driving led lighting equipment ordering information part no. package packing ts19372cx5 rf sot-25 3kpcs / 7 reel block diagram pin definition : 1. sw 2. ground 3. c t 4. i sense 5. v in
ts19372 buck (step-down) wled driver with external switch 2/9 version: d09 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 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 specifications (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 =6v~40v -- 30 45 ua discharge current i discharge v in =6v~40v 180 230 290 ua switching frequency f osc c t = 100pf, -- 180 -- khz 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 tes t to maintain junction temperature as close to ambi ent temperature as possible pin description pin function description 1 sw driver switching pin 2 ground ground pin. 3 timing capacitor timing capacitor oscillator inpu t 4 i sense peak current sense input to monitor the voltage dro p across an external resistor to limit the peak current through the circ uit 5 vin input voltage supply pin
ts19372 buck (step-down) wled driver with external switch 3/9 version: d09 application information inductor selection a 100uh inductor is recommended for most ts19372 ap plications. although small size and high efficiency are major concerns, the inductor should have low core l osses at 180khz and low dcr (copper wire resistance ). diode selection schottky diodes, with their low forward voltage dro p and fast reverse recovery, are the ideal choices for ts19372 applications. the forward voltage drop of a schottk y diode represents the conduction losses in the dio de 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 forw ard voltage drop and larger diode capacitance, which can cause significant switching losses at the 180khz switchin g frequency of the ts19372. capacitor selection for input capacitor and timing capacitor are able t o use small ceramic capacitor for most of ts19372 a pplications. when ac input, to add a 100f electric capacitor fo r input capacitor is recommended.
ts19372 buck (step-down) wled driver with external switch 4/9 version: d09 typical application circuit (dc input) reference design information: ts19372cx5 + tsm2318cx vin range (v) l (uh) led (series) led (w) current (ma) r1 (ohm) r2 (ohm) efficiency (%) 12 68 3pcs 1 350 0.54 1k 88 24 100 6pcs 1 350 0.54 1k 92 ts19372cx5 + tsm4436cs vin range (v) l (uh) 1w led (series) led (w) current (ma) r1 (ohm) r2 (ohm) efficiency (%) 12 68 3pcs 3 700 0.32 1k 88 12 68 2pcs 5 1000 0.22 1k 88 12 68 2pcs 5 1400 0.1 1k 86 24 100 6pcs 3 700 0.16 1k 92 24 100 6pcs 5 1000 0.11 1k 92 24 100 6pcs 5 1400 0.03 1k 90 bill of materials: designation description package manufacture remark led driver ts19372cx5 sot-25 tsc -- d1 sk34a sma tsc 3a, 40v m1 tsm2318cx sot-23 tsc n-ch 40v / 3.9a tsm4436cs sop-8 tsc n-ch 60v / 8a cin 10uf 805 generic ceramic c1 820pf 805 generic ceramic input voltage vs. efficiency
ts19372 buck (step-down) wled driver with external switch 5/9 version: d09 typical application circuit (ac input) reference design information: ts19372cx5 + tsm2318cx vin range (v) l (uh) led (series) led (w) current (ma) r1 (ohm) r2 (ohm) efficiency (%) 12 68 3pcs 1 350 0.54 1k 88 24 100 6pcs 1 350 0.54 1k 92 ts19372cx5 + tsm4436cs vin range (v) l (uh) 1w led (series) led (w) current (ma) r1 (ohm) r2 (ohm) efficiency (%) 12 68 3pcs 3 700 0.32 1k 88 12 68 2pcs 5 1000 0.22 1k 88 12 68 2pcs 5 1400 0.1 1k 86 24 100 6pcs 3 700 0.16 1k 92 24 100 6pcs 5 1000 0.11 1k 92 24 100 6pcs 5 1400 0.03 1k 90 bill of materials: designation description package manufacture remark led driver ts19372cx5 sot-25 tsc -- d1 sk34a sma tsc 3a, 40v d2.3.4 ss23m usma tsc 2a, 30v m1 tsm2318cx sot-23 tsc n-ch 40v / 3.9a tsm4436cs sop-8 tsc n-ch 60v / 8a cin 10uf 805 generic ceramic c1 820pf 805 generic ceramic input voltage vs. efficiency
ts19372 buck (step-down) wled driver with external switch 6/9 version: d09 typical application circuit C buck dimming control circuit 1w led 3s1p bill of materials: designation description package manufacture remark led driver ts19372cx5 sot-25 tsc -- d1 sk34a sma tsc 3a, 40v m1. m2 tsm2n7002kcx sot-23 tsc m3 tsm2318cx sot-23 tsc n-ch 40v / 3.9a l1 100uh -- generic isat >1.5a r1 0.1 1206 generic -- r2, r3 1k 1206 generic -- r4, r5, r6 10k 1206 generic c1 10uf 805 generic ceramic c2 820pf 805 generic ceramic
ts19372 buck (step-down) wled driver with external switch 7/9 version: d09 typical application circuit C buck on/off control c ircuit 1w led 3s1p bill of materials: designation description package manufacture remark led driver ts19372cx5 sot-25 tsc -- d1 sk34a sma tsc 3a, 40v m1 tsm2n7002kcx sot-23 tsc m2 tsm2318cx sot-23 tsc n-ch 40v / 3.9a l1 100uh -- generic isat >1.5a r1 0.1 1206 generic -- r2, r3 1k 1206 generic -- r4 10k 1206 generic c1 820pf 805 generic ceramic c2 100uf generic tantalum or electrolysis * ac input
ts19372 buck (step-down) wled driver with external switch 8/9 version: d09 sot-25 mechanical drawing marking diagram 72 = devi e code y = year 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 dim millimeters inches 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 0o 10o 0o 10o s1 0.95 bsc 0.0374 bsc
ts19372 buck (step-down) wled driver with external switch 9/9 version: d09 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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