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?2002 fairchild semiconductor corporation www.fairchildsemi.com rev. 1.0.5 features ? programmable output voltage to 36 volts ? low dynamic output impedance 0.20 typical ? sink current capability of 1.0 to 100ma ? equivalent full-range temperature coefficient of 50ppm/ c typical ? temperature compensated for operation over full rated operating temperature range ? low output noise voltage ? fast turn-on response description the ka431/ka431a/ka431l are three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. the output voltage may be set to any value between vref (approximately 2.5 volts) and 36 volts with two external resistors these devices have a typical dynamic output impedance of 0.2w active output circuitry provides a very sharp turn on characteristic, making these devices excellent replacement for zener diodes in many applications. to-92 8-dip 8-sop 1. ref 2. anode 3. cathode 1 1 1 1.cathode 2.3.6.7.anode 4.5.nc 8.ref 1.cathode 2.3.4.5.7.nc 6.anode 8.ref internal block diagram ka431/ka431a/ka431l programmable shunt regulator
ka431/ka431a/ka431l 2 absolute maximum ratings (operating temperature range applies unless otherwise specified.) recommended operating conditions parameter symbol value unit cathode voltage v ka 37 v cathode current range (continuous) i ka -100~ + 150 ma reference input current range i ref 0.05~ + 10 ma power dissipation d, z suffix package dip package p d 770 1000 mw mw operating temperature range t opr -25 ~ + 85 o c storage temperature range t stg -65 ~ + 150 o c parameter symbol min typ max unit cathode voltage v ka v ref - 36 v cathode current i ka 1.0 - 100 ma
ka431/ka431a/ka431l 3 electrical characteristics (t a = +25 c , unless otherwise specified) ? t min = -25 o c, t max = +85 o c parameter symbol conditions ka431 ka431a ka431l unit min. typ. max. min. typ. max. min. typ. max. reference input voltage v ref v ka =v ref , i ka =10ma 2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508 v deviation of reference input voltage over- temperature d vref/ d t vka=vref, ika=10ma tmin ta tmax - 4.5 17 - 4.5 17 - 4.5 17 mv ratio of change in reference input voltage d vref/ d vka ika =10ma d vka=10 v-vref - - 1.0 - 2.7 - - 1.0 - 2.7 - - 1.0 - 2.7 mv/v to the change in cathode voltage d vka=36 v-10v - -0.5 -2.0 - -0.5 -2.0 - -0.5 -2.0 reference input current iref ika=10ma, r1=10k w ,r2= - 1.5 4 - 1.5 4 - 1.5 4 m a deviation of reference input current over full temperature range d iref/ d t ika=10ma, r1=10k w ,r2= ta =full range - 0.4 1.2 - 0.4 1.2 - 0.4 1.2 m a minimum cathode cur- rent for regulation ika(min) vka=vref - 0.45 1.0 - 0.45 1.0 - 0.45 1.0 ma off - stage cathode current ika(off) vka=36v, vref=0 - 0.05 1.0 - 0.05 1.0 - 0.05 1.0 m a dynamic impedance zka vka=vref, ika=1 to 100ma f 3 1.0khz - 0.15 0.5 - 0.15 0.5 - 0.15 0.5 w
ka431/ka431a/ka431l 4 test circuits figure 1.test circuit for v ka =v ref figure 2.test circuit for v ka 3 v ref figure 3. test circuit for l ka(off)
ka431/ka431a/ka431l 5 typical perfomance characteristics figure 4. cathode current vs. cathode voltage figure 5. cathode current vs. cathode voltage figure 6. change in reference input voltage vs. cathode voltage figure7. dynamic impedance frequency figure 8. small signal voltage amplification vs. frequency figure 9. pulse response
ka431/ka431a/ka431l 6 typical perfomance characteristics (continued) 100p 1n 10n 100n 1 10 0 20 40 60 80 100 120 140 d c b a a v ka = vref b v ka = 5.0 v @ i k = 10 ma c v ka = 10 v @ i k = 10 ma d v ka = 15 v @ i k = 10 ma t a = 25 o c i k , cathode current(ma) c l , load capacitance figure 10. stability boundary conditions
ka431/ka431a/ka431l 7 typical application v o 1 r 1 r 2 ------- + ? ?? v ref = v o v ref 1 r 1 r 2 ------- + ? ?? = v o 1 r 1 r 2 ------- + ? ?? v ref = figure 11 . shunt regulator figure 12 . output control for minal fixed regulator three- te r - figure 13. high current shunt regulator figure 14. current limit or current source figure 15. constant-current sink
ka431/ka431a/ka431l 8 mechanical dimensions package dimensions in millimeters to-92
ka431/ka431a/ka431l 9 mechanical dimensions (continued) package dimensions in millimeters 8-dip
ka431/ka431a/ka431l 10 mechanical dimensions (continued) package dimensions in millimeters 8-sop
ka431/ka431a/ka431l 11 ordering information product number output voltage tolerance package operating temperature ka431lz 0.5% to-92 -25 ~ + 85 o c ka431ld 8-sop ka431az 1% to-92 ka431ad 8-sop ka431 2% 8-dip ka431z to-92 ka431d 8-sop
ka431/ka431a/ka431l 3/5/02 0.0m 001 stock#dsxxxxxxxx 2002 fairchild semiconductor corporation life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others.
product folder - fairchild p/n ka431a - adjustable/2.5v, 1% tolerance shunt regulator fairchild semiconductor space space space search | parametric | cross reference space product folders and datasheets application notes space space space find products home >> find products >> space space space space products groups space analog and mixed signal discrete interface logic microcontrollers non-volatile memory optoelectronics markets and applications new products product selection and parametric search cross-reference search technical information buy products technical support my fairchild company ka431a adjustable/2.5v, 1% tolerance shunt regulator related links request samples dotted line how to order products dotted line product change notices (pcns) dotted line support dotted line distributor and field sales representatives dotted line quality and reliability dotted line design tools contents general description | features | product status/pricing/packaging general description the ka431/ka431a/ka431l are three- terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. the output voltage may be set to any value between vref (approximately 2.5 volts) and 36 volts with two external resistors. these devices have a typical dynamic output impedance of 0.2w. active output circuitry provides a very sharp turn-on characteristic, making these devices excel lent replacement for zener diodes in many applications. back to top features l programmable output voltage to 36 volts l low dynamic output impedance 0.20 typical l sink current capability of 1.0 to 100ma l equivalent full-range temperature coefficient of 50ppm/c typical l temperature compensated for operation over full rated operating temperature range l low output noise voltage l fast turn-on response back to top space datasheet download this datasheet pdf e-mail this datasheet [e- mail] this page print version file:///e|/new/html/ka431a.html (1 of 2) [7/26/02 12:15:15 pm]
product folder - fairchild p/n ka431a - adjustable/2.5v, 1% tolerance shunt regulator product status/pricing/packaging product product status package type leads packing method ka431azmbu not recommended for new designs to-92 3 bulk ka431aztf full production to-92 3 tape reel KA431AZBU full production to-92 3 bulk ka431adtf full production soic 8 tape reel ka431azmta not recommended for new designs to-92 3 tape reel ka431azta full production to-92 3 tape reel back to top space space home | find products | technical information | buy products | support | company | contact us | site index | privacy policy ? copyright 2002 fairchild semiconductor space space file:///e|/new/html/ka431a.html (2 of 2) [7/26/02 12:15:15 pm]

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