www.belling.com.cn v1.0 page1 BL317 high current adjustable voltage regulator BL317 description the b l3 17 is an ad ju stab le 3 -termina l po sitive voltage regu la to r, de signed to sup p ly 1a o f ou tpu t cu rren t with vo ltag e ad ju stab le fro m 1.3v ~ 35v. features t ypica l 1% ou tpu t vo lta ge t o le ran ce outpu t vo lta ge ad ju sta ble fro m 1. 3v ~35v outpu t cu rren t in exc ess o f 1a in te rn al sho rt c irc u it p rotec tion in te rn al o ve r te mp eratu re pro tec tio n outpu t tran sisto r sa fe a rea c o mp en sa tion applications p c moth erboa rd lcd m on ito r graph ic ca rd dvd p la yer netwo rk in terfa ce ca rd /s witch teleco m e qu ip men t p rin te r and o th er p erip hera l eq u ip men t p in no. s ymb o l defin ition 1 adj. adju stab le 2 vout outpu t 3 vin inp ut
www.belling.com.cn v1.0 page2 BL317 block diagram absolute maximum ratings (ta =25 c ) * charac te ristic s ymb o l min . max. unit inp ut - ou tpu t vo ltag e diffe re nce vin -v ou t 37 v p ower dissipa tion p d in te rn al limite d max imu m jun c tion te mpera tu re t j 150 c storag e te mp erature t s -40 150 c le ad te mpe ra tu re (so ld erin g, 10 sec ) t l e a d 260 c esd (h u man bod y mod el) esd 4000 v *: a bso lu te ma ximu m ratin gs a re stre ss ra ting s o nl y and func tio na l d e vice op era tion is not imp lied . th e d e vic e c ou ld be da mag ed be yo nd abs o lu te ma x imu m ra ting s.
www.belling.com.cn v1.0 page3 BL317 electrical characteristics (vin -vout=5v, iout=1 0 ma, t a=25 c , unless o the rwise spe cifie d. ) * charac te ristics test cond itio ns s ymb o l min . typ . max. unit refe re nc e voltage 10 ma i o u t 1a 3v (v i n -v o u t ) 37v p d Q 20w v r e f 1.20 1.25 1.30 v lin e reg u la tion 3v Q v in -vout Q 3 7v s v 0.01 0.04 %/v lo ad re gu la tio n 0 ma Q iout Q 1a si 0.2 0.4 % adju st p in c urre n t iad j 50 100 a adju st p in cu rren t chan ge 3v Q v in -vout Q 3 7v, 10 ma Q iout Q 1a, p d Q 20w iad j 0.2 5.0 a min imu m load curre n t vin -vout=37v i l m i n 3.5 10.0 ma ripp le re je c tion f=120h z,cout=1 f ta nta lu m, (v i n -v o u t )=3v, i o u t = 1a rr 60 75 db te mp era ture stab ility tm in Q tj Q tmax 0.7 % rms ou tp u t no ise (% o f v o u t ) ta=25 , 1 0hz f 10k hz en 0.00 3 % therma l resistan ce , junction to c ase sot-223 to -25 2 to -22 0 to -26 3 j c 23 12 5 5 /w therma l resistan ce , junction to amb ien t sot-223 to -25 2 to -22 0 to -26 3 j a 165 112 54 64 /w therma l shu tdo wn h yste resis th ys 25 *: ma ximu m p o we r d issipa tion is p acka ge t ype and ca se t e mpe ra tu re dep end en t.
www.belling.com.cn v1.0 page4 BL317 application circuit
www.belling.com.cn v1.0 page5 BL317 characteristics curves
www.belling.com.cn v1.0 page6 BL317 outline drawing sot-223 un it:mm to -22 0 un it:mm
www.belling.com.cn v1.0 page7 BL317 to -25 2 un it:mm to -26 3 un it:mm
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