NJM431 - 1 - ver.2012-06-15 adjustable precision shunt regulator general description package outline the NJM431 is a 3 terminal adjustable shunt regulator. the output voltage may be set to any value between v ref (about 2.5v) and 36v by two resistors. output circuitry shows a sharp turn-on characteristics. applications include shunt regulators, series regulators for small power and isolation regulators with photo couplers. features ? operating voltage (v ka = v ref to 36v) ? fast turn-on response ? cathode current (1ma to 100ma) ? low dynamic output impedance (0.2 ? typ.) ? load regulation typically (0.1%) ? package outline dip8, dmp8, sot-89 ? bipolar technology pin configuration equivalent circuit NJM431u NJM431d NJM431m NJM431d (dip8) NJM431m (dmp8) NJM431u (sot-89)
NJM431 - 2 - ver.2012-06-15 block diagram absolute maximum ratings (t a =25c) parameter symbol ratings unit cathode voltage (note) v ka 37 v continuous cathode current i k -100 to 150 ma reference input current i ref -0.05 to 10 ma power dissipation p d (dip8) 700 (dmp8) 300 (sot89) 350 mw mw mw operating temperature t opr -40 to +85 oc storage temperature range t stg -40 to +125 oc (note) unless specified, all voltage val ue are with respect to the anode terminal. recommended operating conditions parameter symbol min. typ. max. unit cathode voltage v ka v ref - 36 v cathode current i k 1 - 100 ma electrical characteristics (t a = 25 ? c) parameter symbol test condition min. typ. max. unit reference voltage v ref v ka = v ref , i k = 10ma (note 1) 2440 2495 2550 mv reference voltage change (full oper. temp. range) v ref (dev) v ka = v ref , i k = 10ma (note 1) ta = -20oc to +85 oc - 8 17 mv ? v ka = 10v - v ref - -1.4 -2.7 mv/v reference voltage change vs. cathode voltage change ? v ref ? v ka i k = 10ma (note 2) ? v ka = 36v - 10v - -1 -2 mv/v reference input current i ref i k = 10ma, r1 = 10k ? , r2 = (note 2) - 2 4 a reference input current change (full oper. temp. range) i ref (dev) i k = 10ma, r1 = 10k ? , r2 = (note 2) ta = -20oc to +85 oc - 0..4 1.2 a minimum input current i min v ka = v ref (note 1) - 0.4 1.0 ma cathode current (off cond.) i off v ka = 36v, v ref = 0 (note 3) - 0.1 1.0 a dynamic impedance |z ka | v ka = v ref , i k = 1ma to 100ma, f 1khz (note 1) - 0.2 0.5 ? (note 1) test circuit (fig. 1) (note 2) test circuit (fig. 2) (note 3) test circuit (fig. 3)
NJM431 - 3 - ver.2012-06-15 test circuits 1. v ka = v ref 2. v ka > v ref 3. i off v o = v ka = v ref v o = v ka = v ref ? ? ? ? ? ? + r2 r1 1 + i ref r1 (fig. 1) (fig. 2) (fig. 3) typical application (1) shunt regulator (2) series regulator (3) output control of a three-terminal fixed regulator (4) constant current source power dissipation vs. ambient temperature 0 200 400 600 800 0 25 50 75 100 ambient temperature ta (c) power dissipation p d (mw) NJM431u NJM431d NJM431m 3mw/c 3.5mw/c 7mw/c
NJM431 - 4 - ver.2012-06-15 typical characteristics reference voltage reference voltage reference input current v ref (dev) (ta = -20 to 25c) (ta = 25 to 85c) (ta = 25c) no. 1 +5mv +1mv 2525mv no. 2 0mv 0mv 2501mv no. 3 0mv -6mv 2481mv no. 4 -2mv -9mv 2468mv no. 5 -5mv -12mv 2456mv reference voltage i ref (dev) no.1 -0.38a no.2 -0.27a no.3 -0.21a safety operating boundary condition dynaminc impedance [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. note) oscillation might occure while operating within the range of safety curve. so that, it is necessary to make ample margins by taking considerations of fluctuation of the device.
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