IP431A series semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 2/95 part jCpack nCpack dCpack amb. temp. number 8 pin 8 pin 8 pin range IP431Am 4 -55 to +125c IP431Ai 444 -40 to +85c IP431Ac 444 0 to +70c programmable precision reference v ka cathode to anode voltage i k cathode current range i ref reference input current range p d power dissipation @ t a = 25c d package n package j package derate above 25c p d power dissipation @ t c = 25c d package n package j package t j maximum operating junction temperature t a operating ambient temperature range t stg storage temperature range 37v -100 to +150ma -0.05 to +10ma 0.70w 1.10w 1.25w 6mw/c 1.5w 3w 3.3w 150c see table above C65 to 150c absolute maximum ratings (t case = 25c unless otherwise stated) features ? voltage reference tolerance 1% ? programmable output voltage to 36v ? equivalent full range temperature coefficient of 30ppm/c typical ? temperature compensated for operation over full rated operating temperature range ? sink current capability 1 to 100 ma ? fast turnCon response ? low dynamic output impedance (0.2 w w typical) ? low output noise voltage ? also available in toC92 package top view 1 2 3 4 8 7 6 5 cathode nc nc nc nc nc anode ref top view 5 1 2 3 4 8 7 6 cathode anode nc nc anode ref j package C 8 pin ceramic dip n package C 8 pin plastic dip d package C 8 pin plastic (150) soic * note that the soic package used for the IP431A has a modified lead frame to increase power dissipation capability when appropriately mounted on a pcb. note: to order, add the package identifier to the part number. eg. IP431Amj IP431Acd
IP431A series semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 2/95 block diagram description the IP431A circuit is a monolithic three terminal programmable shunt regulator diode. the voltage reference operates as a low temperature coefficient zener which is programmable between v ref (2.5v) and 36 volts using two external resistors. the device has a wide operating current range of 1 ma to 100ma and a typical dynamic impedance of 0.2 w . active output circuitry provides a very sharp turn-on characteristic making these devices excellent replacements for zener diodes in many applications. being a shunt regulator it can be used as either a positive or negative voltage reference. cathode anode ref 2.5 v ref v ka cathode to anode voltage i k cathode current range v ref to 36v 1.0 to 100ma recommended operating conditions * this test is not applicable to surface mount (d package) devices. IP431Am parameter test conditions min. typ. max. units v ka = v ref i k = 10ma t a = -55 to +125c * v ka = v ref i k = 10ma t a = -55 to +125c * i k = 10ma r1 = 10k w r2 = i k = 10ma t a = -55 to +125c * r1 = 10k w r2 = i k = 10ma t a = -55 to +125c * v ka = v ref v ka = 36v v ref = 0 v ka = v ref f 1khz d i k = 1ma to 100ma d v ka = 10v to v ref d v ka = 36v to 10v v ref d v ref d v ref d v ka i ref d i ref i min i off |z ka | reference input voltage (figure 1) reference input voltage over temperature range 1 (figure 1) ratio of reference voltage change to change in cathode to anode voltage (figure 2) reference input current (figure 2) reference input current deviation over temperature range (figure 2) minimum cathode current for regulation (figure 1) offCstate cathode current (figure 3) dynamic impedance 2 (figure 1) v mv mv/v m a m a ma na w 2.47 2.495 2.52 2.426 2.564 15 44 14 7 13 0.5 1 3 1000 0.2 0.5 -1.5 -2.7 -0.7 -2 electrical characteristics (t a = 25 c unless otherwise stated)
IP431A series semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 2/95 IP431Ai parameter test conditions min. typ. max. units v ka = v ref i k = 10ma t a = -40 to +85c * v ka = v ref i k = 10ma t a = -40 to +85c * i k = 10ma r1 = 10k w r2 = i k = 10ma t a = -40 to +85c * r1 = 10k w r2 = i k = 10ma t a = -40 to +85c * v ka = v ref v ka = 36v v ref = 0 v ka = v ref f 1khz d i k = 1ma to 100ma d v ka = 10v to v ref d v ka = 36v to 10v v ref d v ref d v ref d v ka i ref d i ref i min i off |z ka | reference input voltage (figure 1) reference input voltage over temperature range 1 (figure 1) ratio of reference voltage change to change in cathode to anode voltage (figure 2) reference input current (figure 2) reference input current deviation over temperature range (figure 2) minimum cathode current for regulation (figure 1) offCstate cathode current (figure 3) dynamic impedance 2 (figure 1) v mv mv/v m a m a ma na w 2.47 2.495 2.52 2.44 2.55 730 14 6.5 0.8 2.5 0.5 1 3 1000 0.2 0.5 -1.5 -2.7 -0.7 -2 IP431Ac parameter test conditions min. typ. max. units v ka = v ref i k = 10ma t a = 0 to +70c * v ka = v ref i k = 10ma t a = 0 to +70c * i k = 10ma r1 = 10k w r2 = i k = 10ma t a = 0 to +70c * r1 = 10k w r2 = i k = 10ma t a = 0 to +70c * v ka = v ref v ka = 36v v ref = 0 v ka = v ref f 1khz d i k = 1ma to 100ma d v ka = 10v to v ref d v ka = 36v to 10v v ref d v ref d v ref d v ka i ref d i ref i min i off |z ka | reference input voltage (figure 1) reference input voltage over temperature range 1 (figure 1) ratio of reference voltage change to change in cathode to anode voltage (figure 2) reference input current (figure 2) reference input current deviation over temperature range (figure 2) minimum cathode current for regulation (figure 1) offCstate cathode current (figure 3) dynamic impedance 2 (figure 1) v mv mv/v m a m a ma na w 2.47 2.495 2.52 2.453 2.537 317 14 5.2 0.4 1.2 0.5 1 3 1000 0.2 0.5 -1.5 -2.7 -0.7 -2 electrical characteristics (t a = 25 c unless otherwise stated) * this test is not applicable to surface mount (d package) devices.
IP431A series semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 2/95 figure 2 test circuit for v ka > v ref figure 3 test circuit for i off figure 1 test circuit for v ka = v ref r1 |z ka | ? |z ka | 1+ r2 note 1 the deviation parameter d v ref is defined as the differences between the maximum and minimum values obtained over the full operating ambient temperature range that applies. the average temperature coefficient of the reference input voltage, v ref is defined as: v ref can be positive or negative depending on whether v ref min or v ref max occurs at the lower ambient temperature. ref vmin ref v max t1 t2 ambient temperature d v ref ( ) x 10 6 ppm v ref @ 25c v ref = = c d t a d v ref x 10 6 = d t a (v ref @ 25c) example: d v ref = 8.0 mv and slope is positive, v ref @ 25c = 2.495v, d t a = 70c 0.008 x 10 6 = 45.8 ppm/c v ref = = 45.8 ppm/c 70 (2.495) note 2 the dynamic impedance z ka is defined as: d v ka |z ka | = d i k when the device is programmed with two external resistors, r1 and r2, (refer to figure 2) the total dynamic impedance of the circuit is defined as: ( ) ref i ka v input k i ref v ka v input off i ka v input k i ref v d v ref =v ref max - v ref min d t a = t2 - t1 r1 v ka = v ref 1+ + i ref x r1 r2 ( )
IP431A series semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 2/95 v+ i out r cl i out = r cl v ref constant current source typical applications r2 r1 v+ v out v ref v out = r2 r1 1+ shunt regulator v ref v ref ip7805 in common out v+ r2 r1 v out = + 5v v out(min) v out = r2 r1 1+ output control of a three-terminal fixed regulator v ref i sink v+ i sink = r s r s constant current sink v out v+ r2 r1 v ref v out = r2 r1 1+ high current shunt regulator v ref =+ v out(min) v out = r2 r1 1+ v ref v be v+ r2 r1 v out series pass regulator
IP431A series semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 2/95 r2 r1 = v out(trip) v ref r2 r1 1+ v+ v out triac crowbar typical applications thermal characteristics r2 r1 = v out(trip) v ref r2 r1 1+ v out v+ thyristor crowbar r4 r3 v out v+ r2 r1 v ref r2 r1 1+ lower limit = v ref upper limit = 1+ r4 r3 led is on when v+ is between the upper and lower limits. voltage monitor v in v+ v out = v ref v th v in v out ref > v ref < v v+ = 2.0 v single supply comparator with temperature compensated threshold r q ja thermal resistance, junction C ambient d package n package j package r q jc thermal resistance, junction C case d package n package j package 178c/w 114c/w 100c/w 83c/w 41c/w 38c/w
IP431A series semelab plc. telephone (01455) 556565. telex: 341927. fax (01455) 552612. prelim. 2/95 typical performance characteristics cathode current vs cathode voltage reference input voltage vs ambient temperature cathode current vs cathode voltage reference input current vs ambient temperature change in reference input voltage vs ambient temperature off Cstate cathode current vs ambient temperature v cathode voltage (v) ka i cathode current (ma) k ka v input ka v= v ref t a = 25?c i k -100 -50 0 50 100 150 -2 -1 0 1 2 3 t ambient temperature (?c) a v reference input voltage (mv) ref ka v input ka v= v ref i k = 10ma i k v ref -55 -25 0 25 75 100 125 50 2400 2420 2440 2460 2480 2500 2520 2540 2560 2580 2600 v reference input voltage (mv) ref v cathode voltage (v) ka -32 -28 -24 -20 -16 -12 -8 -4 0 0 10203040 t a = 25?c ka v input i k r1 ref i i k = 10ma v ref r2 v cathode voltage (v) ka i cathode current ( m a) k ka v input ka v= v ref t a = 25?c i k -10123 -200 0 200 400 600 800 v reference input voltage (mv) ref t ambient temperature (?c) a i k = 10ma ka v input i k 10 k w ref i i k = 10ma 0.00 0.25 0.50 0.75 1.00 1.25 1.50 -55 -25 0 25 75 100 125 50 i offCstate cathode current (na) off t ambient temperature (?c) a ka v input ka v= 36v i off = 0 ref v -55 -25 0 25 75 100 125 50 0.01 0.1 1 10 100 1000
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