ip431csm4 prelim. 4/98 semelab plc. telephone +44(0)1455 556565. fax +44(0)1455 552612. e-mail: sales@semelab.co.uk website: http://www.semelab.co.uk 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 csm4 package derate above 25c 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 0.80w 6.4w/c 150c see table above ?65 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 turn?on response low dynamic output impedance (0.2 w w w w typical) low output noise voltage 1 2 3 4 5.59 0.13 (0.22 0.005) 0.23 (0.009) rad. 1.02 0.20 (0.04 0.008) 2.03 0.20 (0.08 0.008) 1.40 0.15 (0.055 0.006) 0.25 0.03 (0.01 0.001) 0.23 (0.009) min. 1.27 0.05 (0.05 0.002) 3.81 0.13 (0.15 0.005) 0.64 0.08 (0.025 0.003) pin 1 - not connected pin 2 - cathode pin 3 - reference pin 4 - anode lcc3 hermetically sealed ceramic surface mount package part number ambient temp. range ip431csm4 -55 to +125 c
ip431csm4 prelim. 4/98 semelab plc. telephone +44(0)1455 556565. fax +44(0)1455 552612. e-mail: sales@semelab.co.uk website: http://www.semelab.co.uk 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 IP431AM parameter test conditions min. typ. max. units v ka = v ref i k = 10ma t a = -55 to +125 c * v ka = v ref i k = 10ma t a = -55 to +125 c * i k = 10ma r1 = 10k w r2 = i k = 10ma t a = -55 to +125 c * r1 = 10k w r2 = i k = 10ma t a = -55 to +125 c * 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) off ? state 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)
ip431csm4 prelim. 4/98 semelab plc. telephone +44(0)1455 556565. fax +44(0)1455 552612. e-mail: sales@semelab.co.uk website: http://www.semelab.co.uk ip431ai parameter test conditions min. typ. max. units v ka = v ref i k = 10ma t a = -40 to +85 c * v ka = v ref i k = 10ma t a = -40 to +85 c * i k = 10ma r1 = 10k w r2 = i k = 10ma t a = -40 to +85 c * r1 = 10k w r2 = i k = 10ma t a = -40 to +85 c * 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) off ? state 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 +70 c * v ka = v ref i k = 10ma t a = 0 to +70 c * i k = 10ma r1 = 10k w r2 = i k = 10ma t a = 0 to +70 c * r1 = 10k w r2 = i k = 10ma t a = 0 to +70 c * 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) off ? state 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)
ip431csm4 prelim. 4/98 semelab plc. telephone +44(0)1455 556565. fax +44(0)1455 552612. e-mail: sales@semelab.co.uk website: http://www.semelab.co.uk 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 @ 25 c v ref = = c d t a d v ref x 10 6 = d t a (v ref @ 25 c) example: d v ref = 8.0 mv and slope is positive, v ref @ 25 c = 2.495v, d t a = 70 c 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 ( )
|
