zr431 adjustable precision zener shunt regulator zr431 document number: ds33255 rev. 6 - 2 1 of 9 www.diodes.com october 2011 ? diodes incorporated advance information description the zr431 is a three terminal adjustable shunt regulator offering excellent temperatur e stability and output current handling capability up to 100ma. the output voltage may be set to any chosen voltage between 2.5 and 20 volts by selection of two extern al divider resistors. the devices can be used as a r eplacement for zener diodes in many applications requiring an improvement in zener performance. features ? surface mount sot223 and sot23 packages ? 2%, 1 % and 0.5% tolerance ? max. temperature coefficient 55 ppm/c ? temperature compensated for operation ? over the full temperature range ? programmable output voltage ? 50 a to 100ma current sink capability ? low output noise ? all package options available in ?green? molding compound (no br, sb) and lead free finish/ rohs compliant (note 1) pin assignments applications ? shunt regulator ? series regulator ? voltage monitor ? over voltage/ under voltage protection ? switch mode power supplies notes: 1. eu directive 2002/95/ec (rohs). all applicab le rohs exemptions applied. please visit our website at http://www.diodes.com /products/lead_free.html . typical application circuit ? + v ref v z gnd gnd v ref v z 1 3 2 sot23 (top view) 1 2 3 4 v z gnd v ref gnd sot223 pin 4 floating or connected to pin 2 (top view )
zr431 adjustable precision zener shunt regulator zr431 document number: ds33255 rev. 6 - 2 2 of 9 www.diodes.com october 2011 ? diodes incorporated advance information absolute maximum ratings (note 2) symbol parameter rating unit v z cathode voltage 20 v i z cathode current 150 ma t a operating temperature -40 to +85 c t st storage temperature -55 to +125 c p d power dissipation (notes 3, 4) sot23 330 mw sot223 2 w notes: 2. operation above the absolute maximum rating may cause device failure. operation at the absolute maximum ratings, for extended periods, may reduce device reliability. unless otherwise stat ed voltages specified are relative to the anode pin. 3. t j , max =150c. 4. ratings apply to ambi ent temperature at 25c. recommended operating conditions (t a = 25 c) symbol parameter min max unit v z cathode voltage v ref 20 v i z cathode current 0.05 100 ma electrical characteristics (t a = 25 c unless otherwise specified) symbol parameter test conditions min typ. max unit v ref reference voltage (note 5) 2% 1 % 0.5% i l = 10ma (fig 1), v z = v ref 2.45 2.475 2.487 2.50 2.50 2.50 2.55 2.525 2.513 v v dev deviation of reference input voltage over temperature i l = 10ma, v z = v ref t a = full range (fig 1) 8.0 17 mv v ref v z ratio of the change in reference voltage to the change in cathode voltage v z from v ref to 10v i z = 10ma (fig 2) -1.85 -2.7 mv/v v z from 10v to 20v i z = 10ma (fig 2) -1.0 -2.0 i ref reference input current r1 = 10k, r2 = o/c, i l = 10ma (fig 2) 0.12 1.0 a i ref deviation of reference input current over temperature r1 = 10k, r2 = o/c, i l = 10ma t a = full range (fig 2) 0.04 0.2 a i z(min) minimum cathode current for regulation v z = v ref (fig 1) 35 50 a i z(off) off-state current v z = 20v, v ref = 0v (fig 3) 0.1 a r z dynamic output impedance v z = v ref (fig 1), f = 0hz 0.75 ? note 5: 0.5% and 1% sot23 only for definitions of reference voltage temperature coefficient a nd dynamic output impedance see notes following dc test circuits
zr431 adjustable precision zener shunt regulator zr431 document number: ds33255 rev. 6 - 2 3 of 9 www.diodes.com october 2011 ? diodes incorporated advance information dc test circuits fig. 1 test circuit for v z = v ref fig. 2 test circuit for v z > v ref fig.3 test circuit for off state current deviation of reference input voltage, v dev , is defined as the maximum variation of the reference input voltage over the full temperature range. the average temperature coefficient of the reference input voltage, v ref is defined as: )2t1t(v 1000000 v )c/ppm(v ref dev o ref ? = the dynamic output impedance, rz is defined as: z z z i v r = when the device is programmed with two external resistors, r1 and r2, (fig 2), the dyna mic output impedance of the overall circuit, r?, is defined as: ) 2r 1r 1(rr z += input i l i ref i z v z v ref input i l i ref i z v z v ref r1 r2 input i zoff v z t1 t2 temperature v = v - v dev max min v max v min
zr431 adjustable precision zener shunt regulator zr431 document number: ds33255 rev. 6 - 2 4 of 9 www.diodes.com october 2011 ? diodes incorporated advance information typical characteristics -40 -20 0 20 40 60 80 temperature (c) reference current vs. temperature 160 140 140 130 120 110 100 r e f e r e n c e c u r r e n t (na) v = v i = 10ma ref z z 0 cathode voltage (v) change in v vs. cathode voltage ref 5101520 -10 -5 -15 -20 -25 change in reference output voltage (mv) i = 10ma z -40 -20 0 20 40 60 80 temperature (c) cathode current vs. temperature 24 26 28 30 32 34 36 38 m i n i m u m c a t h o d e c u r r e n t (a) v = v ref z 100 frequency (hz) dynamic impedance vs. frequency 1k 10k 100k 1m 0.1 1.0 10 100 dynamic impedance ( ) 2.506 2.504 2.502 2.500 2.498 2.496 2.494 2.492 2.490 -40 -20 0 20 40 60 80 temperature (c) reference voltage vs. temperature r efe r ence v o lta g e (v) i = 10ma z 25 50 75 85 100 ambient temperature ( c) power dissipation derating 2.0 0 1.0 sot223 sot23 p o we r dissi p a t i o n (w)
zr431 adjustable precision zener shunt regulator zr431 document number: ds33255 rev. 6 - 2 5 of 9 www.diodes.com october 2011 ? diodes incorporated advance information typical characteristics (cont.) i z = 10ma, t a = 25c test circuit for open loop voltage gain t a = 25c test circuit for pulse response v ref < v z < 20, i z = 10ma, t a = 25c test circuit for stability boundary conditions 100 1k 10k 100k 1m frequency (hz) gain vs. frequency 0 20 40 60 o p en l o o p v o l t a g e g ain (db) 0 0.2 0.4 0.6 0.8 1.0 time (s) pulse response 0 0 5.0 1.0 2.0 3.0 v o l t a g e swi n g (v) repetitive pulse single pulse v z input 10p 100p 1000p 0.01 0.1 1 load capacitance (f) stability boundary conditions 0 20 40 60 80 100 c a t h o de c u r r e n t (ma) stable stable v z 230 i z 15k 9f 8k25 + - 220 v z 50 input monitor pulse generator input 150 i z 10k v z
zr431 adjustable precision zener shunt regulator zr431 document number: ds33255 rev. 6 - 2 6 of 9 www.diodes.com october 2011 ? diodes incorporated advance information application characteristics v ref 2r 1r 1 v out ? ? ? ? ? ? += shunt regulator v ref 2r 1r 1 v out ? ? ? ? ? ? += higher current shunt regulator v out(min) = v ref + v reg v ref 2r 1r 1 v out ? ? ? ? ? ? += output control of a three terminal fixed regulator v ref 2r 1r 1 v out ? ? ? ? ? ? += series regulator single supply comparator with temperature compensated threshold v ref b2r b1r 1itlimlow ? ? ? ? ? ? ++ v ref a2r a1r 1itlimhigh ? ? ? ? ? ? ++ over voltage/under voltage protection circuit v+ v out v ref r1 r2 zsr*** common in out v+ v ref v out r2 r1 30 0.01f v+ v out v ref r1 r2 v+ v out r1 r2 v ref v+ input v = 2.5v th output v = v+ off v 2v on v+ v ref output v ref r1a r1b r2a r2b
zr431 adjustable precision zener shunt regulator zr431 document number: ds33255 rev. 6 - 2 7 of 9 www.diodes.com october 2011 ? diodes incorporated advance information ordering information device tolerance package code part mark packaging 7? tape and reel quantity part number suffix zr431f005-7 0.5% f 43r sot23 3000/tape & reel -7 zr431f005ta 0.5% f 43r sot23 3000/tape & reel ta zr431f01-7 1% f 43b sot23 3000/tape & reel -7 zr431f01ta 1% f 43b sot23 3000/tape & reel ta ZR431FTA 2% f 43a sot23 3000/tape & reel ta zr431gta 2% g zr431 sot223 1000/tape & reel ta tolerance packing -7: tape & reel ta : tape & reel zr431 x xxx xx 005 : 0.5% 0.1 : 1% blank : 2% package f : sot23 g : sot223
zr431 adjustable precision zener shunt regulator zr431 document number: ds33255 rev. 6 - 2 8 of 9 www.diodes.com october 2011 ? diodes incorporated advance information package outline dimensions (all dimensions in mm) (1) package type: sot23 (2) package type: sot223 sot23 dim min max typ a 0.37 0.51 0.40 b 1.20 1.40 1.30 c 2.30 2.50 2.40 d 0.89 1.03 0.915 f 0.45 0.60 0.535 g 1.78 2.05 1.83 h 2.80 3.00 2.90 j 0.013 0.10 0.05 k 0.903 1.10 1.00 k1 - - 0.400 l 0.45 0.61 0.55 m 0.085 0.18 0.11 0 8 - all dimensions in mm sot223 dim min max typ a 1.55 1.65 1.60 a1 0.010 0.15 0.05 b1 2.90 3.10 3.00 b2 0.60 0.80 0.70 c 0.20 0.30 0.25 d 6.45 6.55 6.50 e 3.45 3.55 3.50 e1 6.90 7.10 7.00 e ? ? 4.60 e1 ? ? 2.30 l 0.85 1.05 0.95 q 0.84 0.94 0.89 all dimensions in mm a m j l d f b c h k g k1 a1 a
zr431 adjustable precision zener shunt regulator zr431 document number: ds33255 rev. 6 - 2 9 of 9 www.diodes.com october 2011 ? diodes incorporated advance information important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products desc ribed herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized a pplication. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety-critical, life support devices or systems. copyright ? 2011, diodes incorporated www.diodes.com
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