cys tech electronics corp. s pec. no. : c513 f3 issued date : 20 03.05.24 revised date :20 10.07.22 page no. : 1/1 1 LM317F3 c y s t ek product s pecification three terminal adjustable output positive voltage regulators LM317F3 the LM317F3 is an adjustable 3?termi nal positive voltage regulator capable of supplying in excess of 1.5 a over an out put voltage range of 1.2 v to 37 v. this voltage regulator is exceptionall y easy to use and requires only two ex- ternal resistors to set the output voltage . further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blow?out proof. the LM317F3 serves a wide variety of a pplications includin g local, on-card regulation. this device can also be used to make a programmable output regulator , or by connecting a fixed resistor between the adjustment and output, the lm317f 3 can be used as a precision current regulator. output current in excess of 1.5 a output adjustable between 1.2 v and 37 v internal thermal overload protection internal short circuit current li miting constant with temperature output transistor safe?area compensation floating operation for hi gh voltage applications eliminates stocking many fixed voltages standard application + + p l 317 r1 r2 c out ci n v i n v out maximum ratings rating symbol value unit input-output voltage differential v i -v o 40 v power dissipation t a =25 ther m a l resistance, junction-to-a mbient ther m a l resistance, ju nction-to-case p d ja jc internally limited 60 3.0 w /w /w operating junction temperature range t opr 0 to +125 storage temperature range tstg -65 to +150 to-263 1.0 f 0.1 f cin is required if regulator is located an appreciate distance from power supply filter. cout is not needed for stability, however, it does improve transient response. v ou t= 1.25( 1+ r 2/ r 1 )+i adj r 2 since i adj is controlled to less than 100 a, the error associated with this term is negligible in most applications. i adj lm3 17 http://
cys tech electronics corp. s pec. no. : c513 f3 issued date : 20 03.05.24 revised date :20 10.07.22 page no. : 2/1 1 LM317F3 c y s t ek product s pecification electrical characteristics (v i -v o =5v,i o =0.5a,t j =0 to 125 , unless otherwise noted ) characteristics symbol conditions min typ max unit t a =25 ,3.0v v i -v o 40v - 0.01 0.04 line regulation( note 1 ) v o(line) t a =0~125 ,3.0v v i -v o 40v - 0.02 0.07 %/v t a =25 v o 6v - 18 25 mv 10ma i o i max v o 5v - 0.4 0.5 %/v o v o 5v - 40 70 mv load regulation( note 1 ) v o(load) 10m a i o i max v o 6v - 0.8 1.5 %/v o adjust pin current i adj - 46 100 a adjust pin current change i adj 2.5v v i -v o 40v, 10ma i o i max p d 20w - 0.2 5.0 a reference voltage vref 3.0v v i -v o 40v, 10ma i o i max p d 20w 1.2 1.25 1.3 v temperature stability ts 0 t j 125 - 0.7 - %/v o minimum load current to maintain regulation i lmin v i -v o =40v - 3.5 10 ma maximum output current imax v i -v o 15v, p d 20w v i -v o 15v, p d 20w, t a =25 1. 5 0.15 2.2 0.4 - - a rms noise vs % of v out en t a =25 , 10hz f 10khz - 0.003 0.01 %/v o v o =10v, f=120hz - 60 - ripple rejection( note 2 ) rr v o =10v, f=120hz, c adj =10 f 66 75 - db long-term stability( note 3) st t a =25 , 1000hrs - 0.3 1.0 % notes: 1.load and line regulation are specified at co nstant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used. 2.c adj , when used, is connect ed between the adjustment pin and ground. 3 . si n c e lo ng-term stab ilit y can no t b e measu r ed on each d e v i ce b e fo re sh i p m e n t , th is sp ecification is an eng i n e ering esti m a te o f av erag e stab ility fro m lo t to lo t. 4.p o wer di s s i p at i o n wi t h i n an ic vol t a ge reg u l a t o r p r od uces a t e m p erat ure gra d i e nt o n t h e di e, af fec t i ng i n di vi dual ic com pone nt s on t h e di e. these ef fect s can be m i nim i zed by pr o p er i n t e g r at ed ci rc ui t desi g n a n d l a y out t e chni que s. th erm al regu latio n is t h e ef fect o f th es e t e m p erat ure g r adi e nt s on t h e o u t p ut v o l t a ge a n d i s ex presse d i n perce n t a ge of output change per watt of power change in a specified time.
cys tech electronics corp. s pec. no. : c513 f3 issued date : 20 03.05.24 revised date :20 10.07.22 page no. : 3/1 1 LM317F3 c y s t ek product s pecification ordering information device package shipping marking LM317F3 to-263 (pb-free) 1000 pcs / tape & reel lm317 characteristic curves r e fe renc e v o ltage vs t e mp erature 1.235 1. 24 1 . 245 1. 25 1 . 255 1. 26 - 5 0 - 25 0 25 5 0 7 5 1 00 1 2 5 tem p er a t u r e( ) r e fe re nc e vol t a ge ---vre f(v) adjustment current vs temperature 35 40 45 50 55 60 - 50 - 25 0 25 5 0 75 10 0 125 te mp er atu r e ( ) adj u st m e nt c urre nt ---ia dj ( a) d r op out v ol t a g e vs input -o ut put v ol t a g e d i f fe re nc e 1 1. 5 2 2. 5 3 0 2 5 5 0 75 100 12 5 t e m p er at u r e( ) i np ut - o ut put v ol t a ge d i f f e r e nc e ( v ) vo=100ma il=1.5a il=1a il=500m a il=200ma il=20ma
cys tech electronics corp. s pec. no. : c513 f3 issued date : 20 03.05.24 revised date :20 10.07.22 page no. : 4/1 1 LM317F3 c y s t ek product s pecification representative schematic diagram fig 1. line regulation and i adj /lin e test cir cuit pu lse testing req u i red 1% duty cycle is suggeste d O v oh -v ol O line regulation(%/ v)= 100 O v ol O
cys tech electronics corp. s pec. no. : c513 f3 issued date : 20 03.05.24 revised date :20 10.07.22 page no. : 5/1 1 LM317F3 c y s t ek product s pecification fig 2. load regulation and ? i adj /load test circuit v o (m in load )-v o(m a x load ) lo ad regu latio n(m v )=v o (min lo ad )-v o (m a x lo ad) load reg u l ation ( %v o)= 1 00 v o (m in load) pulse testing required. 1% duty cycle is suggested. to calculate r2: vout=i set r2+1.250v ass u m e i set =5. 25m a fig 3. standard test circuit
cys tech electronics corp. s pec. no. : c513 f3 issued date : 20 03.05.24 revised date :20 10.07.22 page no. : 6/1 1 LM317F3 c y s t ek product s pecification fig 4. ripple rejection test circuit application information basic circuit operation the lm317 is a 3-terminal floating regulator. in operation, the lm317 develops and maintains a nominal 1.25v reference (vref) between its output and adjustment term inals. this reference voltage is converted to a programming current (iprog) by r 1 (see fig 5), and this constant current flows through r 2 to ground. the regulated output vo ltage is given by: v out=v ref ( 1+r 2 /r 1 )+i adj r 2 since the current from the adjustment terminal (i adj ) represents an error term in the equation, the lm317 was designed to control i adj to less than 100 a and keep it constant. to do this, all quiescent operating current is returned to the output terminal. this im poses the requirement for a minimum load current. if the load current is less than this mi nimum, the output voltage will rise. since the lm317 is a floating regulator, it is only the voltage differential acr oss the circuit which is important to performance, and operation at hi gh voltages with respect to ground is possible. fig 5. basic circuit configuration
cys tech electronics corp. s pec. no. : c513 f3 issued date : 20 03.05.24 revised date :20 10.07.22 page no. : 7/1 1 LM317F3 c y s t ek product s pecification load regulation the lm317 is capable of providing extremely good load regulation, but a few prec autions are needed to obtain maximum performance. for best pe rformance, the programming resistor (r 1 ) should be connected as close to the regulator as possible to minimize line drops which effectively appear in series with the reference, thereby degrading regulation. the ground end of r 2 can be returned near the load ground to provide remote ground sensing a nd improve load regulation. external cap a citors a 0.1 f disc or 1.0 f tantalum input bypass capacitor (cin) is recommended to reduce the sensitivity to input line impedance. the adjustment terminal may be bypassed to grou nd to improve ripple rejection. this capacitor (c adj ) prevents ripple from being amplified as the output voltage is increased. a 10 f capacitor should improve ripple rejection about 15 db at 120 hz in a 10v application. although the lm317 is stable with no output capacitance, like any feedb ack circuit, certain values of external capacitance can cause excessive ringing. an output capacitance (co) in the form of a 1.0 f tantalum or 25 f aluminum electrolytic capacitor on the output swamps this effect and insures stability. protection diodes when external capacitors are used with any ic regulator, it is some times necessary to add protection diodes to prevent the capacitors from dischargi ng through low current points into the regulator. fig 6 shows the lm317 with the recommended protecti on diodes for output voltages in excess of 25v or high capacitance values (co>25 f,c adj >10 f). diode d 1 prevents co from discharging thru the ic during an input short circuit. diode d 2 protects against capacitor c adj discharging through the ic during an output short circuit. the combination of diodes d 1 and d 2 prevents c adj from discharging through the ic during an input short circuit. fig 6. voltage regulator with protection diodes
cys tech electronics corp. s pec. no. : c513 f3 issued date : 20 03.05.24 revised date :20 10.07.22 page no. : 8/1 1 LM317F3 c y s t ek product s pecification application circuits fig 7. ?laboratory? power supply with adju stable current limit and output voltage fig 9. 5.0v electronic shutdown regulator fig 8. adjustable current limiter r1=vref/(iomax+i dss ) r2 vref/i dss vo < bv dss +1.25v+vss i lmin -i dss cys tech electronics corp. s pec. no. : c513 f3 issued date : 20 03.05.24 revised date :20 10.07.22 page no. : 9/1 1 LM317F3 c y s t ek product s pecification fig 10. slow turn-on regulator fig 11. current regulator
cys tech electronics corp. s pec. no. : c513 f3 issued date : 20 03.05.24 revised date :20 10.07.22 page no. : 10/ 1 1 LM317F3 c y s t ek product s pecification recommended wave soldering condition product peak temperature soldering time pb-free devices 260 +0/-5 c 5 +1/-1 seconds recommended temperature profile for ir reflow profile feature sn-pb eutectic assembly pb-free assembly average ramp-up rate (tsmax to tp) 3 c/second max. 3 c/second max. preheat ? temperature min(t s min) ? temperature max(t s max) ? time(ts min to ts max ) 100 c 150 c 60-120 seconds 150 c 200 c 60-180 seconds time maintained above: ? temperature (t l ) ? time (t l ) 183 c 60-150 seconds 217 c 60-150 seconds peak temperature(t p ) 240 +0/-5 c 260 +0/-5 c time within 5 c of actual peak temperature(tp) 10-30 seconds 20-40 seconds ramp down rate 6 c/second max. 6 c/second max. time 25 c to peak temperature 6 minutes max. 8 minutes max. note : all temperatures refer to topside of t he package, measured on the package body surface.
cys tech electronics corp. s pec. no. : c513 f3 issued date : 20 03.05.24 revised date :20 10.07.22 page no. : 1 1/ 1 1 LM317F3 c y s t ek product s pecification t o -263 dimension *:typical inches a b c d 123 k l j g h f e 2 1 2 3 i s t yle : pin 1.adj 2.v out(t ab) 3.v in 3-lead plastic surface mounted package cystek package code : f3 marking : lm317 device name date code millimeters inches millimeters dim min. max. min. max. dim min. max. min. max. a 0.3800 0.4050 9.65 10.29 i 0.0500 0.0700 1.27 1.78 b 0.3300 0.3700 8.38 9.40 j - *0.1000 - *2.54 c - 0.0550 - 1.40 k 0.0450 0.0550 1.14 1.40 d 0.5750 0.6250 14.61 15.88 l 0.0200 0.0390 0.51 0.99 e 0.1600 0.1900 4.06 4.83 1 - - 6 8 f 0.0450 0.0550 1.14 1.40 2 - - 6 8 g 0.0900 0.1100 2.29 2.79 3 - - 0 5 h 0.0180 0.0290 0.46 0.74 notes : 1.controlling dimension : millimeters. 2.maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.if there is any question with packing specification or packing method, please c ontact your local cystek sales office. material : ? lead : pure tin plated. ? mold compound : epoxy resin family, flammability solid burning class:ul94v-0 important notice: ? all rights are reserved. reproduction in whole or in part is prohibited without the prior written approval of cystek. ? cystek reserves the right to make changes to its products without notice. ? cystek semiconductor products are not warranted to be suitable for use in life-support applications, or systems. ? cystek assumes no liability for any consequence of customer pr oduct design, infringement of pat ents, or application assistance .
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