3 . 3 - 1 3 . 3 com7905t com7912t three t erminal, fixed v oltage, 1.5 amp precision negative regulators in hermetic jedec t o-257aa package 8 09 r0 (cots) commercial off-the-shelf fixed voltage nega tive regulat ors in t o-257 features ? isolated hermetic package, jedec to-257aa outline ? output v oltages: -5v, -12v, -15v ? output v oltages set internally to 2% ? built-in thermal overload protection ? short circuit current limiting ? standard of f-the-shelf description these three terminal negative regulators are supplied in a hermetically sealed metal package whose outline is similar to the industry standard t o-220 plastic package. all protective features are designed into the circuit, including thermal shutdown, current limiting and safe-area control. w ith heat sinking, they can deliver over 1.5 amps of output current. these units feature internally trimmed output voltages to 2% of nominal voltage. standard voltages are -5v, -12v, and -15v. however, other voltages are available up to -24 volts. these units are ideally suited for military applications where a hermetically sealed package is required. absolute maximum ra tings @ 25c input v oltage ................................................................. -35 v operating junction t emperature range .......................... - 55c to + 150c storage t emperature range ..................................... - 65c to + 150c t ypical power/thermal characteristics: rated power @ 25 c t c .............................................. 17.5w t a ................................................. 3 w thermal resistance q jc ............................................ 4.2c/w q ja ............................................ 42c/w COM7915T
3 . 3 - 2 3 . 3 com7900t series electrical characteristics -5 vo l t v in = -10v, i o = 500ma, -55c t a 125c (unless otherwise specified) parameter symbol test conditions min. max. unit output voltage v out t a = 25c - 4 . 9- 5 . 1v v in = -7.5v to -20v ? - 4 . 8- 5 . 2v line regulation v rline v in = -7.5v to -20v 12 m v (note 1) ? 25 m v v in = -8.0v to -12v 5 m v ? 12 m v load regulation v rload i o = 5ma to 1.5 amp 20 m v (note 1) ? 25 m v i o = 250ma to 750 ma 15 m v ? 30 m v standby current drain i scd 2.5 m a ? 3.0 m a standby current drain d i scd v in = -7.0v to -20v ? 0.4 m a change with line (line) standby current drain d i scd i o = 5ma to 1000ma ? 0.4 m a change with load (load) dropout voltage v do d v out = 100mv, i o = 1.0a ? 2.5 v peak output current i o (pk) t a = 25c 1.5 3.3 a short circuit current i ds v in = -35v 1.2 a (note 2) ? 2.8 a ripple rejection d v in f =120 hz, d v in = -10v 63 d b d v out (note 3) ? 60 d b output noise voltage n o t a = 25c, f =10 hz to 100khz 40 v/v (note 3) rms long term stability d v out t a = 25c, t = 1000 hrs. 75 m v (note 3) d t electrical characteristics -12 vo l t v in = -19v, i o = 500ma, -55c t a 125c (unless otherwise specified) parameter symbol t est conditions min. max. unit output v oltage v out t a = 25c - 11.76 -12.24 v v in = -14.5v to -27v ? - 1 1.6 -12.4 v line regulation v rline v in = -14.5v to -27v 20 m v (note 1) ? 50 m v v in = -16v to -22v 10 m v ? 30 m v load regulation v rload i o = 5ma to 1.5 amp 32 m v (note 1) ? 60 m v i o = 250ma to 750 ma 16 m v ? 30 m v standby current drain i scd 3.5 m a ? 4.0 m a standby current drain d i scd v in = -14.5v to -27v ? 0.8 m a change wi t h l i n e (line) standby current drain d i scd i o = 5ma to 1000ma ? 0.5 m a change w ith load (load) dropout v oltage v do d v out = 100mv, i o = 1.0a ? 1.8 v peak output current i o (pk) t a = 25c, i o = 5ma to 1a 1.5 3.3 a short circuit current i ds v i n = -35v 1.2 a (note 2) ? 2.8 a ripple rejection d v in f =120 hz, d v in = -10v 56 d b d v out (note 3) ? 53 d b output noise v oltage n o t a = 25c, f =10 hz to 100khz 40 v/v (note 3) rms long t erm stability d v out t a = 25c, t = 1000 hrs. 1 2 0 m v (note 3) d t notes: 1 . load and line regulation are specified at a constant junction temperature. pulse testing with low duty cycle is used. changes in output voltage due to heating ef fects must be taken into account separately. 2 . short circuit protection is only assured up to v in = -35v. 3 . if not tested, shall be guaranteed to the specified limits. the ? denotes the specifications which apply over the full operating temperature range.
3 . 3 - 3 3 . 3 com7900t series electrical characteristics -15 volt v in = -23v, i o = 500ma, -55c t a 125c (unless otherwise specified) parameter symbol test conditions min. max. unit output voltage v out t a = 25c -14.7 -15.3 v v in = -17.5v to -30v ? -14.5 -15.5 v line regulation v rline v in = -17.5v to -30v 25 m v (note 1) ? 50 m v v in = -20v to -26v 15 m v ? 25 m v load regulation v rload i o = 5ma to 1.5 amp 35 m v (note 1) ? 75 m v i o = 250ma to 750 ma 21 m v ? 45 m v standby current drain i scd 6.0 m a ? 6.5 m a standby current drain d i scd v in = -17.5v to -30v ? 0.8 m a change with line (line) standby current drain d i scd i o = 5ma to 1000ma ? 0.5 m a change with load (load) dropout voltage v do d v out = 100mv, i o = 1.0a ? 2.5 v peak output current i o (pk) t a = 25c 1.5 3.3 a short circuit current i ds v in = -35v 1.2 a (note 2) ? 2.8 a ripple rejection d v in f =120 hz, d v in = -10v 53 d b d v out (note 3) ? 50 d b output noise voltage n o t a = 25c, f =10 hz to 100khz 40 v/v (note 3) rms long term stability d v out t a = 25c, t = 1000 hrs. 1 5 0 m v (note 3) d t notes: 1 . load and line regulation are specified at a constant junction temperature. pulse testing with low duty cycle is used. changes in output voltage due to heating effects must be taken into account separately. 2 . short circuit protection is only assured up to v in = -35v. 3 . if not tested, shall be guaranteed to the specified limits. the ? denotes the specifications which apply over the full operating temperature range. 3 . 5 3 2 . 5 2 1 . 5 1 0 . 5 0 051 01 52 02 53 03 5 peak output current d v out = 100mv t j = -55c t j = 25c t j = 150c input to output differential (v) 2 . 5 2 1 . 5 1 0 . 5 0 - 7 5- 5 0- 2 502 55 07 5 100 125 150 d r opout vo ltag e d v out = 100mv i out = 0a i out = 500ma i out = 1a junction temperature (c) 100 8 0 6 0 4 0 2 0 0 1 0 100 1 k1 0 k 100k ripple rejection v out = 5v v i n - v = 8v dc +3.5v rms i out = 1a t j = 25c frequency (hz) typical performance characteristics
3 . 3 205 craw ford street, leominster, ma 01453 usa (978) 534-5776 fax (978) 537-4246 com7900t series typical applica tions mechanical outline pin connection to-257aa fixed output regulator basic current regulator .430 .410 .200 .190 .038 max. .005 .120 typ. .537 .527 .665 .645 .420 .410 .150 .140 .750 .500 .100 typ. .035 .025 .045 .035 123 note: ? case is metal/hermetically sealed ? isolated tab/glass feedthroughs com79xxt isolated front view pin 1: ground pin 2: input pin 3: output tab: isolated tab v in v out 1 f 2.2 f 1 32 com79xx ++ v in i ou 3 1 2 2.2? r1 om79xx i q i out = v out r1 + i q input bypass capacitors are recommended for stable operation of the om7900 series of regulators over the input voltage and output current ranges. output bypass capacitors will improve the transient response of the regulator. the bypass capacitors, (2.2? on the input, 1? on the output) should be ceramic or solid tantalum which have good high frequency characteristics. if aluminum electrolytics are used, their values should be 10? or larger. the bypass capacitors should be mounted with the shortest leads, and if possible, directly across the regulator terminals.
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