to-92 encapsulate adjustable reference source CJ431 adjustable accurate reference source features the output voltage can be adjusted to 36v low dynamic output impedance ,its typical value is 0.2 ? trapping current capability is 1 to 100ma the typical value of the equivalent temperature factor in the whole temperature scope is 50 ppm/ the effective temperature compensation in the working range of full temperature low output noise voltage fast on -state response absolute maximum ratings (operating temperature range applies unless otherwise specified) parameter symbol value units cathode voltage v ka 37 v cathode current range (continuous) i ka -100-+150 ma reference lnput current range iref 0.05-+10 ma power dissipation p d 770 mw storage temperature range tstg -65 ~ +150 electrical characteristics (ta=25 unless otherwise specified) parameter symbol test conditions min typ max unit reference lnput voltage v ref v ka =v ref , i ka =10ma 2.450 2.5 2.550 v deviation of reference input voltage over temperature (note) v ref /t v ka =v ref , i ka =10ma tmin ta tmax 4.5 17 mv v ka =10v~v ref -1.0 -2.7 m v/v ratio of change in reference lnput voltage to the change in cathode voltage v ref /v ka i ka =10ma v ka =36v~10v -0.5 -2.0 m v/v reference lnput current l ref i ka = 10ma,r 1 =10k ? r 2 = 1.5 4 a deviation of reference lnput current over full temperature range l ref /t l ka =10ma, r 1 =10k ? r 2 = t a =full temperature 0.4 1.2 a minimum cathode current for regulation i ka(min) v ka =v ref 0.45 1.0 ma off-state cathode current i ka(off) v ka =36v ,v ref =0 0.05 1.0 a dynamic lmpedance z ka v ka =v ref , l ka =1 to 100ma f 1.0khz 0.15 0.5 ? note:t min =0 ,t max =+70 classification of v ref rank 0 .5 % 1% 2% range 2.4 87 -2.513 2.475-2.525 2.450-2.550 to-92 1.reference 2.anode 3.cathode thermal resistance from junction to ambient r ja 16 2 /w z z z z z z z (fig.1) (fig.1) (fig.2) (fig. 2 ) (fig. 2 ) (fig. 1 ) (fig.3) a,dec,2010 c, jan ,201 2 operating ambient t emperature range t a 0~ + 70 operating junction t emperature t j 150 dongguan nanjing electronics ltd., 1/6 d,jun,2012
i k v ref v ka input figure 1. test circuit for v ka = v ref input i k r2 i ref v ref v ka r1 figure 2. test circuit for v ka > v ref v ka v ref 1 r1 r2 i ref r1 i off input v ka figure 3. test circuit for i off 2/6 d,jun,2012
-2 -1 0 1 2 3 -100 -50 0 50 100 150 -40-20 0 20406080100 2425 2450 2475 2500 2525 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -200 -100 0 100 200 300 400 500 600 700 800 v ka =v ref t a =25 cathode current versus cathode voltage v ka , cathode voltage (v) i k , cathode current (ma) v ka =v ref i k =10ma reference input voltage versus ambient temperature v ref , reference input voltage (mv) t a , ambient temperature ( ) v ka =v ref t a =25 CJ431 typical characteristics cathode current versus ca thode voltage i k , cathode current (ua) v ka , cathode voltage (v) ka ka ref test circuit for v ka =v ref i ka(min) 3/6 d,jun,2012
-40 -20 0 20 40 60 80 100 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 -20 -16 -12 -8 -4 0 -40-20 0 20406080100 0.00 0.25 0.50 0.75 1.00 1.25 1.50 v ka =36v v ref =0v off-state cathode current versus ambient temperature t a , ambient temperature ( ) i off , off-state cathode current (na) i k =10ma t a =25 change in reference input voltage versus cathode voltage v ref , reference input voltage (mv) v ka , cathode voltage (v) CJ431 typical characteristics i k =10ma reference input current versus ambient temperature t a , ambient temperature ( ) i ref , reference input current (ua) test circuit for i off test circuit for i ref test circuit for v ka =v ref ( 1+r1 / r2 ) +r1*i ref 4/6 d,jun,2012
appication information 1. shunt regulator 2 . output control of a three-terminal fixed regulator note a : r should provide cathode current 1ma to the tl431 at minimum v i(batt) 3 . high-current shunt regulator 5/6 d,jun,2012
4 . efficient 5-v precision regulator note a : r b should provide cathode current 1ma to the tl431 . 5 . precision current limiter 6 . precision constant-current sink 6/6 d,jun,2012
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