View GM1431AST23T_2546049.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

description the gm1431 is a three terminal adjustable shunt regulator with thermal stability guaranteed over temperature. output voltage can be adjusted to any value between 2.5v (v ) ref and 36v by using two external resistors. the gm1431 has a typical dynamic output impedance of 0.2 w . active output circuitry provides a very unique turn on characteristic, mak- ing the gm1431 an excellent tum on replacement for zener diodes in many applications such as onboard regula- tion and adjustable power supplies. the gm1431 is an ideal voltage reference for 3.0 to 3.3v switching power sup- plies. the gm1431 shunt regulator is available with 3 voltage tol- erances, 0.5%, 1.0% and 2.0% over t = 0c to + 70c, a and four package options (sot-23, to-92, sot -89 and sop-8). whatever your application is, the gm1431 offers the optimum combination of performance, reliability, and economy. logic symbol application switching power supplies linear regulators adjustable supplies battery-operated computers computer disk drives instrumentation block diagram (positive logic) cathode reference anode + _ v ref cathode reference anode features sink current capability 1 ma to 100ma low dynamic output impedance, 0.2 w typ. 0.5%, 1% or 2% reference voltage tolerance temperature range 0c to+ 70 c available in sot -23, to-92, sot-89 and sop- 8 packages alternate for tl431, tl431, lm431 & as431 g m 1 4 3 1 v 0 . 1 1 www.gammamicro.com 1 a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator power management
sot - 89 to- 92 sop- 8 ref cathode 1 anode 2 3 1 2 3 4 8 7 6 5 anode ref anode nc cathode anode nc anode gm1431g ayww xxx = marking code g** = grade a = assembly location y = y ear ww, w= weekly gm 1431g ayww 12 3 1. ref 2. anode 3. cathode gm1431g ayww marking information & pin configura tions (top view) device code grade package shipping sot-23 sop-8 sop-8 sot-89 sot-23 to-92 to-92 sot-89 sot-23 to-92 to-92 sot-89 naa nab nac 3,000 / t ape &reel units 100 / tube units 2,500 / t ape & reel units 1,000 / t ape & reel units gm1431ast23r gm1431bst23r gm1431cst23r gm1431as8t gm1431as8r gm1431bs8t gm1431bs8r gm1431cs8t gm1431cs8r gm1431ast89r gm1431bst89r gm1431cst89r ordering number precision 0.5% to-92 to-92 a a 1,000 units/ esd bag 2,000 units/ ammo pack(t ape) gm1431at92b gm1431bt92b gm1431ct92b gm1431at92rl gm1431bt92rl gm1431ct92rl 0.5% 0.5% 0.5% 0.5% 0.5% 1% 2% 1% 1% 1% 1% 1% 2% 2% 2% 2% 2% 3,000 / t ape &reel units 2,500 / t ape & reel units 1,000 / t ape & reel units 1,000 units/ esd bag 3,000 / t ape &reel units 2,500 / t ape & reel units 1,000 / t ape & reel units 1,000 units/ esd bag b b c c a a a b b b c c c 2,000 units/ ammo pack(t ape) 2,000 units/ ammo pack(t ape) g m 1 4 3 1 2 sop-8 sop-8 sop-8 sop-8 sot-23 xxxyw anode cathode 2 3 ref 1 100 / tube units 100 / tube units ordering information * for detail ordering number identification, please see last page. **grade a: indicates precision of 0.5%, b: indicates precision of 1%, c: indicates precision of 2% a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator power management
g m 1 4 3 1 3 equivalent schema tic * all component values are nominal. pin numbers shown are for the d package. cathode ref anode 2.4k w 7.2k w 3.28k w 20pf 800 w 1k w 4k w 800 w 800 w 20pf 150 w 10k w a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator power management
g m 1 4 3 1 4 these are stress ratings only. functional operation of the device at these or any conditions beyond the "recommended operating conditions" is not implied. exposure to absolute maximum rated conditions may affect device reliability. notes: 1. voltage values are with respect to the anode except as noted. 2. maximum power dissipation is a function of t , q and t . maximum allowable power dissipation at any allowable ambient temperature is j(max) ja a p = (t - d j(max) 3. package thermal impedance is calculated per jesd 51. recommended opera ting conditions p ara met er sym bol v alu e uni t 37 v cont inuou s cat hode curre nt i k -100 to 1 50 ma refe rence inpu t curr ent r ange i ref -50 a t o 10m a ma powe r diss ipatio n at t = 25 c a sot -23 sop -8 to- 92 sot -89 oper ating amb ient t empe ratur e ran ge t a 0 to 7 0 c t j lead temp eratu re (so lderin g) 10 seco nds t lead 260 p d 0.23 0.60 0.78 0.80 w q ja 336 132 163 132 c/w c (1) cath ode v oltag e pack age t herm al im peda nce (2, 3) sot -23 to- 92 sop -8 sot -89 v ka p ara met er sym bol mini mum max imum unit cath ode v oltag e v ka v ref 36 v cath ode c urren t i k 1.0 100 ma absolute maximum ratings (over free-air temperature range except as noted) a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator power management
g m 1 4 3 1 5 electrical characteristics (t = 25c unless otherwise noted) a gm1431a (0.5%) p ara met er con ditio n min typ max unit refe rence inpu t v oltag e v ref (1) v = v , i = 10 ma, t = 25 c ka ref k a 2.487 2.50 0 2.512 v (1) v =v ,i =10 m a,t = 0 to 70c ka ref k a v temp devi ation ref v dev (1) v = v , i = 10 ma , t = ful l rang e ka ref k a 4 17 mv ratio of ch ange in v ref to ch ange in v ka i = 10 ma k -1.0 -0.4 mv /v refe rence inpu t curr ent i ref (2) i = 10m a, r 1 = 1 0k w , r2 = k 1.3 4.0 m a i ref(de v) (2) i = 10 ma, r1 = 10k w , r2 = k t = fu ll ran ge a 0.4 1.2 m a mini mum ope rating curr ent i k(min ) (1) v= v ka ref 1.0 ma off- state cath ode curre nt i k(off ) (3) v = 36v , v = 0v ka ref 0.1 1 (3) v = 16 v , v = 0v ka ref dyna mic i mped ance | z | ka (1) f 1kh z,v =v , i =100 m a t o 100 ma ka ref k 0.2 0.50 w d v ref d v ka m a gm1 431b (1.0 %) notes: (1) see test circuit 1 on page 5. (2) see test circuit 2 on page 5. (3) see test circuit 3 on page 5. d v = 10v to v ka ref d v = 36v to 10v ka -2.7 -2.0 0.4 p ara met er con ditio n min typ max unit refe rence inpu t v oltag e v ref (1) v = v , i = 10 ma, t = 25 c ka ref k a 2.474 2.50 0 2.525 v (1) v =v ,i =10 m a,t = 0 to 70c ka ref k a v temp devi ation ref v dev (1) v = v , i = 10 ma , t = ful l rang e ka ref k a 4 17 mv ratio of ch ange in v ref to ch ange in v ka i = 10 ma k -1.0 -0.4 mv /v refe rence inpu t curr ent i ref (2) i = 10m a, r 1 = 1 0k w , r2 = k 1.3 4.0 m a i ref(de v) (2) i = 10 ma, r1 = 10k w , r2 = k t = fu ll ran ge a 0.4 1.2 m a mini mum ope rating curr ent i k(min ) (1) v= v ka ref 1.0 ma off- state cath ode curre nt i k(off ) (3) v = 36v , v = 0v ka ref 0.1 1 (3) v = 16 v , v = 0v ka ref dyna mic i mped ance | z | ka (1) f 1kh z,v =v , i =100 m a t o 100 ma ka ref k 0.2 0.50 w d v ref d v ka m a d v = 10v to v ka ref d v = 36v to 10v ka -2.7 -2.0 0.4 a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator devi ation of re feren ce input curr ent o ver fu ll temp eratu re ra nge devi ation of re feren ce input curr ent o ver fu ll temp eratu re ra nge power management
g m 1 4 3 1 6 electrical characteristics (t = 25c unless otherwise noted) a gm1431c (2.0%) notes: (1) see test circuit 1. (2) see test circuit 2. (3) see test circuit 3. p ara met er con ditio n min typ max unit refe rence inpu t v oltag e v ref (1) v = v , i = 10 ma, t = 25 c ka ref k a 2.45 2.50 0 2.55 v (1) v =v ,i =10 m a,t = 0 to 70c ka ref k a v temp devi ation ref v dev (1) v = v , i = 10 ma , t = ful l rang e ka ref k a 4 17 mv ratio of ch ange in v ref to ch ange in v ka i = 10 ma k -1.0 -0.4 mv /v refe rence inpu t curr ent i ref (2) i = 10m a, r 1 = 1 0k w , r2 = k 1.3 4.0 m a i ref(de v) (2) i = 10 ma, r1 = 10k w , r2 = k t = fu ll ran ge a 0.4 1.2 m a mini mum ope rating curr ent i k(min ) (1) v= v ka ref 1.0 ma off- state cath ode curre nt i k(off ) (3) v = 36v , v = 0v ka ref 0.1 1 (3) v = 16 v , v = 0v ka ref dyna mic i mped ance | z | ka (1) f 1kh z,v =v , i =100 m a t o 100 ma ka ref k 0.2 0.50 w d v ref d v ka m a d v = 10v to v ka ref d v = 36v to 10v ka -2.7 -2.0 0.4 a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator devi ation of re feren ce input curr ent o ver fu ll temp eratu re ra nge test circuits v in v ka l k test circuit 1 v = v ka ref l ref r2 v in v ka r1 v ref l ref test circuit 2 v > v ka ref l (off) k v in v ka test circuit 3 off-state v ref v ref power management
g m 1 4 3 1 7 typical applica tions gm1431a, gm1431b figure 3. output control for a three terminal fixed regulator r1 r2 gm 7805 in out common v = v + 5.0v out(min) ref v =( + ) out 1 r1 r2 v ref v in v out series pass regulator figure 4. v in v out r1 r2 figure 1. shunt regulator v in r1 r2 v =( + ) out 1 r1 r2 v ref v out figure 2. high current shunt regulator r1 r2 v =( + ) out 1 r1 r2 v ref v in v out constant current source figure 5. r cl v in i= out v ref r cl i out v out figure 6. constant current sink v in i = sink v ref r s i sink r s figure 7. triac crowbar r1 r2 v in v out v =( + ) out(trip) 1 r1 r2 v ref figure 8. scr crowbar r2 r1 v =( + ) out(trip) 1 v ref r1 r2 v in v out v =( + ) out 1 r1 r2 v ref v = v + v 2.0v out(min) ref be a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator power management
g m 1 4 3 1 8 typical performance characteristics cathode voltage (v) -1 -0.5 0 0.5 1 1.5 2 2.5 3 1000 800 600 400 200 0 -200 -400 c a t h o d e c u r r e n t ( m a ) figure 9. cathode current vs. cathode voltage -2 -1 0 1 2 3 200 150 100 50 0 -50 -100 -150 cathode voltage (v) c a t h o d e c u r r e n t ( m a ) figure 10. cathode current vs. cathode voltage 0 20 40 60 80 0.6 0.5 0.4 0.3 0.2 0.1 0 t , ambient tempera ture (c) a i , r e f e r e n c e i n p u t c u r r e n t ( m a ) r e f figure 11. reference input current versus ambient temperature 0 100k 200k 300k 400k 500k 600k 2.5 2 1.5 1 0.5 0 frequency (hz) i m p e d a n c e ( w ) figure 12. dynamic impedance frequency 0 20 40 60 80 2.5 2.498 2.496 2.494 2.492 2.49 2.488 2.486 t , ambient tempera ture (c) a v , r e f e r e n c e i n p u t v o l t a g e ( v ) r e f figure 13. reference input voltage versus ambient temperature 100 1m 1k 10k 100k 80 70 60 50 40 30 20 10 0 -10 -20 figure 14. open-loop voltage gain vs. frequency a , o p e n l o o p v o l t a g e g a i n ( d b ) v o l f, frequency (hz) i =10ma ka t =25c a 0 36 72 108 144 180 p h a s e s h i f t 100 90 80 70 60 50 40 30 20 10 0 0 123 456 7 10 10 10 10 10 10 10 10 i - c a t h o d e c u r r e n t ( m a ) k c -load capacitance(pf) l figure 15. stability boundary conditions (no oscillation at v =10v and v =15v) ka ka a b stability region t = 25 a a: v = v ka ref b: v = 5v ka c: v = 10v ka d: v = 15v ka a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator power management
g m 1 4 3 1 9 design guide for ac-dcsmps (switching mode power supply) use of shunt regulator in t ransformer secondary side control this example is applicable to both forward transformers and flyback transformers. a shunt regulator is used on the secondary side as an error amplifier, and feedback to the primary side is provided via a photocoupler. dc characteristic determination: in figure 16, r 1 and r are protection resistor for the light emitting 2 diode in the photocoupler, and r is a bypass 2 resistor to feed i minimum, and these are k determined as shown below. the photocoupler specification should be obtained separately from the manufacturer. using the parameters in figure 16, the following formulas are obtained: v is the gm1431 operating voltage, and is set at k around 3v, taking into account a margin for fl uctuation. r is the current shunt resistance for the 2 light emitting diode, in which a bias current i of b around 1/5 i flows. f next, the output voltage can be determined by r 3 and r , and the following formula is obtained: 4 the absolute values of r and r are determined by 34 the gm1431 reference input current i and the ac ref characteristics described in the next section. the i ref value is around 1.3a t yp. determination of external costants for the shunt regulator r1 = , r 2 = v - v - v of k i + i fb v f i b v = x v , v =2 .5 v typ o ref erf r3 +r4 r4 gm384x gm38c4x transformer phototransistor photocoupler light emitting diode v f r 1 r 2 r 3 r 4 r 5 c 1 v k i f i b ref gnd v o (+) (-) output vref figure 16. typical shunt regulator/ error amplifier sbd gm1431 a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator power management
g m 1 4 3 1 10 this refers to the determination of the gain frequency characteristic of the shunt regulator as an error amplifier. t aking the configuration in figure 16, the error amplifier characteristic is as shown in figure 17. ac characteristic determination: figure 17. gm1431 error amplification characteristic g1 g2 when r = 0 5 g a i n g ( d b ) f1 f ac f2 when r = 0 5 in figure 17, the following formulas are obtained: gain g = g 50 db to 60 db (determined by shunt regulator) 10 g = 2 corner frequencies f = 1/(2 p c g r) 11 0 3 f = 1/(2 p c r) 2 1 5 g is the shunt regulator open-loop gain; this is given by the reciprocal of the reference voltage fluctuation 0 d vref/ d v , and is approximately 50 db. ka r 5 r 3 practical example consider the example of a photocoupler, with an internal light emitting diode v = 1.05 v and i = 2.5 ma, f f power supply output voltage v = 5 v, and bias resistance r current of approximately 1/5 i at 0.5 ma. if 22 f the shunt regulator v = 3 v, the following values are found. k next, assume that r = r = 10 k w . this gives a 5 v output. if r = 3.3 k w and c = 0.022 f , the 34 5 1 following values are found. g = 3.3 k w / 10 k w = 0.33 times (?10 db) 2 f = 1 / (2 x p x 0.022 f x 316 x 10 k w ) = 2.3 (hz) 1 f = 1 / (2 x p x 0.022 f x 3.3 k w ) = 2.2 (khz) 2 r = =316 w 1 5v - 1.05v - 3v 2.5ma + 0.54ma r = =2.1 k w 2 1.05v 0.54ma f frequency f (hz) osc * : pwm switching frequency f osc a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator power management
g m 1 4 3 1 11 sot-89 package outline dimensions pad layout 45 1 . 5 1.5 0.7 3 2 1 4.50 0.05 units: mm 1.650 ref 1.400 ref 4.20 0.05 1.00 0.07 2.5 0.05 0.46 0.025 3.00 0.025 1.50 1.50 1.50 0.05 0.38 0.01 6 r 0.13~3x no draft~2 r 0.1 max 6~2x 6~2x r 0.13~2x r 0.13~2x unit: mm r 0.13~4x sot-23 p ackage outline dimensions 2.90 0.1 0.4 0.1 1.5 0.05 0.95 0.038 2.8 0.1 1.9 0.05 unit: mm 0.65 0.05 1.10 0.1 5 0.13 0~0.1 0.8 0.05 a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator 0.079 2.0 0.031 0.8 inches mm ( ) 0.035 0.9 0.037 0.95 0.037 0.95 pad layout power management
g m 1 4 3 1 12 to-92 p ackage outline dimensions 4.6 0.1 4.6 0.1 2.3 3 - 0.46 1.45 0.1 14.5 0.5 1.27 1.27 2 2 2 2 3.6 0.15 0.38 0.015 3.6 0.15 1.3 0.1 5 5 unit: mm a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator 0.275 7.0 0.155 4.0 0.060 1.52 0.050 1.270 0.024 0.6 inches mm ( ) pad layout sop-8 p ackage outline dimensions 0.236 0.008 0.050 nom 1.270 nom +0.21 -0.20 5.990 3.91 0.1 +0.003 -0.004 0.154 pin indent 1.600 0.130 0.063 0.005 0.057 nom 1.450 nom 0.175 0.075 0.007 0.003 +0.004 -0.003 0.016 +0.10 -0.08 0.410 +0.0018 -0.0005 0.008 +0.05 -0.01 0.200 +0.013 -0.022 0.028 +0.33 -0.56 0.710 +0.002 -0.004 0.191 +0.05 -0.10 4.850 inches mm ( ) 0 ~ 8 power management
g m 1 4 3 1 13 ordering number gm 1431 a t92 b gamma micro. circuit type voltage t olerance a: 0.5% b: 1.0% c: 2.0% package t92: to-92 st23: sot-23 s8: sop-8 st89: sot-89 shipping b : esd bag rl: ammo pack (tape) r: t ape & reel t : tube a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator power management
g m 1 4 3 1 12 a a m i c r o e l e c t r o n i c s gm1431 adjustable shunt regulator power management 14

▲Up To Search▲

Price & Availability of GM1431AST23T

	To Download GM1431AST23T Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .