lab seme ip78t12ct IP78T12ACT prelim. 9/94 semelab plc. telephone +44(0)1455 556565. fax +44(0)1455 552612. e-mail: sales@semelab.co.uk website: http://www.semelab.co.uk t package ? to?220 plastic package 12 volt, 3 amp positive voltage regulator v i dc input voltage p d power dissipation t j operating junction temperature range t stg storage temperature range t l lead temperature (soldering, 10 sec) 35v internally limited 0c to +125c ?65c to +150c 300c mechanical data dimensions in mm (inches) absolute maximum ratings (t case = 25c unless otherwise stated) 14.99 0.25 (0.590 0.010) 10.16 0.25 (0.400 0.01) 3.12 0.25 (0.123 0.010) 4.45 ?0.25 (0.175 ?0.010) 1.27 0.13 (0.050 0.005) 3.96 0.13 (0.156 0.005) dia. 1.27 0.13 (0.050 0.005) 0.181 (0.07) min. 14.73 (0.580) 12.70 (0.500) 0.81 0.13 (0.032 0.005) 2.54 0.13 (0.100 0.005) 5.08 (0.200) nom. 0.38 ?0.051 (0.015 0.002) 2.59 ?0.30 (0.102 ?0.012) 9.04 ?0.25 (0.356 ?0.010) 3? 28.78 ?0.25 (1.133 0.010) 7.5? 123 2 features ? 0.04%/v line regulation 0.3%/a load regulation thermal overload protection short circuit protection safe operating area protection 1% tolerance start?up with negative voltage ( supplies) on output alternate package styles available pin 1 ?v in pin 2 ?gnd pin 3 ?v out
all characteristics are measured with a capacitor across the input of 0.22mf and a capacitor across the output of 0.1mf. all characteristics except noise voltage and ripple rejection ratios are measured using pulse techniques (t p ?10ms , d ?5%). output voltage changes due to changes into internal temperature must be taken into account separately. 11.88 12 12.12 11.64 12.36 36 75 10 1.5 1.5 75 58 72 52 3 4 84 34 11.5 12 12.5 11.4 12.6 60 150 14 3.0 3.0 75 52 72 48 3 4 84 4 lab seme ip78t12ct IP78T12ACT prelim. 9/94 semelab plc. telephone +44(0)1455 556565. fax +44(0)1455 552612. e-mail: sales@semelab.co.uk website: http://www.semelab.co.uk IP78T12ACT ip78t12ct parameter test conditions min. typ. max. min. typ. max. units v o output voltage dv o line regulation dv o load regulation i q quiescent current di q quiescent current change v n output noise voltage dv in ripple rejection dv o i sc short circuit current i pk peak output current long term stability r qjc thermal resistance junction to case i o = 1a v in = 14.8v v in = 15.4v to 22v p out ?25w i o = 5ma to 3a t j = 0 to +125? i o = 1a v in = 14.8v to 22v t j = 0 to +125? i o = 5ma to 3a v in = 15.4v t j = 0 to +125? i o = 5ma to 3a v in = 15.4v t j = 0 to +125? i o = 5ma to 3a v in = 15.4v t j = 0 to +125? i o = 1a v in = 14.8v to 22v t j = 0 to +125? f = 10hz to 100khz f = 120hz t j = 25? v in = 15.4v to 25.4v t j = 0 to +125? i o = 1a v in = 15.4v v in = 15.4v v v mv mv ma ma ma mvrm s db a mv electrical characteristics (t j = 25? unless otherwise stated)
lab seme ip78t12ct IP78T12ACT prelim. 9/94 semelab plc. telephone +44(0)1455 556565. fax +44(0)1455 552612. e-mail: sales@semelab.co.uk website: http://www.semelab.co.uk 0 25 50 75 100 125 0.98 1.02 0.99 1.01 temperature ( ? c) normalised output voltage (v) 1.00 frequency (hz) output impedance ( ? ) 10 100 1k 10k 100k 1m 0.0001 0.001 0.01 0.1 1 10 c = 0 out c = 10 f out v = 10v in v = 5v out i = 1a out frequency (hz) ripple rejection (db) 1 10 100 1k 10k 100k 1m 20 40 60 80 100 v = 5v out c = 0 out t = 25 ? c j v = 13v dc + 3.5v rms in i = 50m a out i = 3a out output voltage (v) ripple rejection (db) 0 5 10 15 20 25 50 60 70 80 90 t = 25 ? c j v v = 8v dc + 3.5v rms in out i = 1a out f = 120hz input output differential (v) output current (a) 0 5 10 15 20 25 30 35 0 1 2 3 4 5 6 t = 25 ? c j junction temperature ( ? c) input output differential (v) 0 25 50 75 100 125 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 i = 3a out i = 1a out i = 0.5a out ? v = 100mv out typical performance characteristics dropout voltage ripple rejection output impedance ripple rejection output voltage (normalised to 1v at t j = 25c) current limit
lab seme ip78t12ct IP78T12ACT prelim. 9/94 semelab plc. telephone +44(0)1455 556565. fax +44(0)1455 552612. e-mail: sales@semelab.co.uk website: http://www.semelab.co.uk typical performance characteristics applications information input voltage (v) output current (ma) 5 101520253035 3.50 4.00 4.50 5.00 5.50 6.00 6.50 v = 5v out t = 25 ? c j i = 1a out junction temperature ( ? c) quiescent current (ma) 3.50 4.00 4.50 5.00 5.50 i = 1a out v = 5v out v = 10v in 0 25 50 75 100 125 quiescent current quiescent current regulator input output 1 3gnd 2 c1* 0.22 f c2** regulator input output 1 3gnd 2 c1 0.22 f r1 r2 regulator in pu t output 1 3 2 c1 0.22 f r1 ou t i * required if the regulator is located far from the power supply filter. ** although no output capacitor is needed for stability, it does help transient response. if needed, use a 0.1mf ceramic disk. v out = v reg + (v reg / r1 + i q ) r2 v reg / r1 > 3 i q ( r1 + r2 ) load regulation (l r ) (l r of regulator) r1 [ ] v reg i out =+ i q r1 di q = 3.0ma over line and load changes. fixed output regulator adjustable output regulator current regulator
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