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?? ??? LT4761 LT4761 ??3?1a????3?a automotive flashers controller ?? ??? LT4761 ??? 3?1a????3?a? ?????3?o????3???e??? 1a?a? ???????????a?a???o??e?ao1y?1?1|?? LT4761 2??|????????????????????? 1 ? ??3?a1|??1o 8v - 18v ?3? 12v 1a??1?? 2 ? ?a?o ??????y2?y?e?a? ???e??3??? ????a?3?1y 21 ?? 25 a ? ???a?11?? ?H1a??e??3?2??e?? ??a????y3?? ??ea?a ??a??a1??1a???y31? 3 ? 1y?1?o?????13?1y 22v ? 12 v 1a??? ? 30 .5v ? 24v 1a??????? ee??3????3?1y???1???1? ???a?11?? ?H1a??e??3?2? ?e?????3y1??o???ea?a??a??a1??1a???y31? 4 ? ?3?a?2?e????a?3??a???eo????1???|? 5 ? LT4761 ???? u a a 1041b ???|?? ?t? ?11?e? 1. a?11o LT4761 2??a dip8 o so8 ? 2. 1????e?1|?????o LT4761 1 2 3 5 7 6 4 8 ???? ?????????e?t1??? ? 2???o?:030913 1 free datasheet http://
y??? pin description y?? pin ?o? sy m bol 1|? function 1 gnd ? ic ground 2 v s ????1 supply voltage 3 out ????????3? relay control output 4 o s c ???? oscillator 5 o s c ???? oscillator 6 scd on/of f ?a?2a?a / 1? short circuit detection on/of f 7 ld ?1???2a l a m p f a i l u r e d e t e c t i o n 8 si ????? start input y? ???t2?y limit parameter 2?y param e ter ?o? sym bol ??? unit ???? rated value 1|o? power dissipation pd m w 350 ?3?? output current iout m a 300 ??a junction tem p erature t j ?? 150 1?a? w o rk tem p erature t a ?? -40 ?? 100 ??a? storage tem p erature t s tg ?? -60 ?? 150 2 ???? ?????????e?t1??? ? 2???o?:030913 ?? ??? LT4761 free datasheet http://
??? ?2?y electricity parameter ? ta ? 2 5 ??? 2?y param e ters ?o? sy m bol 2a???t te s t condition ?e? ? min ?e ? t yp ??? max ??? unit 1|?3???1 w o rk battery voltage v b 8.0 18.0 v 1y?1?2a? o v er voltage checkout threshold dth ? ov ? v 2 -v 1 18.0 20.2 21.5 v ?????1 clam ping voltage v 1k v 2 -v 1 29.0 31.5 34.0 v ?a?2a? short circuit checkout threshold dth ? sv ? v 2 -v 1 0.63 0.7 0.77 v 1|o????????a? power dissipation current(of f) (relay breaks of f ) icc(of f) v2-v1=13.5 v -2.5 -1.6 -1.0 m a 1|o???????o?? pow e r dissipation current(on) (relay is closed ) icc(on) v 2 -v 1=13 .5 v -5.6 m a ???3?y??y31?? oscillation constant (norm a l work) k n 1.4 1.5 1.6 ???3?y????e??? oscillation constant (lam p is dam a ged) k f 0.63 0.68 0.73 ??y?2a? lam p checkout threshold vth (v pin2-v p i n 7 ) v 2 -v 1=13 .5 v r3 ? 220 |? 79.0 85.3 91.0 m v ???? s t arting resistance rst rs+ ??y 3 . 6 k |? ??????y31?? bright period(n o rm al w o rk) 45.0 50.0 55.0 % 3 ???? ?????????e?t1??? ? 2???o?:030913 ?? ??? LT4761 free datasheet http://
??? ?e|?? 1 ? 12v ?e|??o c2 r3 k2 c1 l3 l4 l2 l1 k1 r1 r2 rs LT4761 1 2 3 5 7 6 4 8 + vc c kj rj a??a?a?t? periphery cir c uit element value 12v ??1|? 24v 12v (pr o tection) 24v r1 150k r1 200k r1 150k r1 200k r2 3.3k r2 3.3k r2 3.3k r2 3.3k r3 220 |? r3 80 |? r3 220 |? r3 80 |? rs 30m |? rs ??? rs 30m |? rs adjustment c1 4.7uf c1 2.2uf c1 4.7uf c1 2.2uf c2 0.047uf c2 ?t c2 0.047uf c2 null ?????|? 80~500 |? spool r e sistance 80~500 |? ??a?\ k2 ???2???a?\ k2 ?o? c2 2??? k2 br eak off w h en having short-cir cui t pr otection, k2 closed and c2 disuse when not having short-cir cuit pr otection. o rs ??y??a?2???2??????? note: rs c a n be adju sted ac cor d ing to the cir c uit board w i ring 4 ???? ?????????e?t1??? ? 2???o?:030913 ?? ??? LT4761 free datasheet http://
2 ? 24v ??3 sg25 - 1 1a?|?? ??o 1. ??a? 2. ?1y?1? 3. ???e???????? c2 r3 c1 l3 l4 l2 l1 k1 r1 r2 rs LT4761 1 2 3 5 7 6 4 8 + vc c d1 t d3 r4 d2 rj kj a??a?a?t? periphery cir c uit element value r1 82k c1 4.7u r1 82k c1 4.7u r2 6.8k c2 0.047u r2 6.8k c2 0.047u r3 220 |? d1 ??1 7.5v r3 220 |? d1 voltage stabiliz ing diode 7.5v r4 7.5k |? d2 ??1 16v r4 7.5k |? d2 voltage stabiliz ing diode 16v rs 56m |? d3 in4004 rs 56m |? d3 in4004 t c1008(o) ? s8050 t c1008(o) or s8050 ??|? 360 |? coil r e sistance 360 |? 5 ???? ?????????e?t1??? ? 2???o?:030913 ?? ??? LT4761 free datasheet http://

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