1 h igh diode semiconductor to-2 52-2l feature three -terminal positive voltage regulator voltage regulators to-252-2l plastic-encapsulate 2 1 3 z z z LM317 internal ther mal overlo ad protection internal short circuit current limiting output transistor safe oper ating are a compensation description this monolithic integrated circui t is an adjustable 3-terminal positive voltage regulator designed to supply more than 1.5a of load current with an output voltage adjustable over a 1.2 to 37v. it employs internal curr ent limiting , thermal shut-down and safe area compensation. z inte r nal block diagram rl i mit 3 vin vo 1 vo lt age reference va d j 2 p r otection circuitry + - i npu t output typical application c i is required when regulator is located an ap preciable distance from power supply filter. c o is not needed for stability , however, it does improve transient response. since i adj is controlled to less than 100a, the error associated with this term is negligible in most applications. 1. adj 2. output 3. input
electrical ch aracteristics (t a =25 unless otherwise noted) h igh diode semiconductor sy mbol para meter value units v i -v o input-output v oltag e differential 40 v t lead lea d temperature 230 p d po w er dissipation internally limited w t j operatin g junction te mperature range 0~125 t stg s t orage temperature range - 5 5~125 v o / t t emperature coefficient of output voltage 0.02 %/ (v o -v i =5 v,i o =0. 5 a,0 t j + 125 ,i max =1 .5a,p dmax = 20w ,unless otherwise specified) pa rame ter symbol test conditions min typ max unit t a =2 5 3v v i -v o 40 v 0.01 0.04 line r e gulation(note1) r lin e 3v v i -v o 40 v 0.02 0.07 %/v t a =2 5 , 10m a i o i ma x v o <5 v v o 5v 18 0.4 25 0.5 loa d reg ulation(note1) r l oad 10ma i o i ma x v o <5 v v o 5v 40 0.8 70 1.5 adjusta b le pin current l ad j - 46 100 adjusta b le pin current change l ad j 3v v i -v o 40 v 10ma i o i ma x , p d p ma x 2.0 5 a refere nce volt age v re f 3v v in -v o 40v 10ma i o i ma x , p d p ma x 1.20 1.25 1.30 v t e mperature stability st t - 0.7 %/ v o minimum load current to maintain regu lati on i l (mi n) v i -v o = 40v 3.5 12 ma maximum output current i o (ma x) v i -v o 15v, p d p ma x v i -v o 40v, p d p ma x t a =2 5 1.0 2.2 0.3 a rms noise,% of v out e n t a =2 5 ,10 hz f 10k hz 0.003 0.01 %/ v o ripp le re jection rr v o =10v, f =12 0 hz without c ad j c ad j = 10f (note2) 66 60 75 db lon g-t erm stability,t j =t hi gh st t a =2 5 for end poi nt mesasurements,1000hr 0.3 1 % t hermal resistance ju nction to case r jc - 5 /w notes : 1. load a nd l ine regulation are specified at constant junction temperature. change in v d d ue to heati ng effects must be taken into account separately. pulse testing with low duty is used.(p ma x = 20w ) 2.c ad j . w hen used, is connected between the adjustment pin and ground. mv v o % electrical ch aracteristics (t a =25 unless otherwise noted)
jshd jshd h l j k ' l r g h 6 h p l f r q g x f w r u to-252-2l 6 < 0 % 2 / 0 , 1 0 $ ; 6 < 0 % 2 / 0 , 1 0 $ ; $ / 5 ( ) $ / e / 5 ( ) f / ' n ' ? e e ' 5 ( ) k ( 9 5 ( ) h / ? p p unit coplanar degrees coplanar degrees to-252-2l
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