?2010 fairchild semiconductor corporation www.fairchildsemi.com rev. 1.0.2 features ? output current in excess of 1.5a ? output voltage adjustable between -1.2v and - 37v ? internal thermal overload protection ? internal short circuit current limiting ? output transistor safe area compensation ? floating operation for hi gh voltage applications ? standard 3-pin to-220 package description the ka337 is a 3-terminal negative adjustable regulator. it supply in excess of 1.5a over an output voltage range of -1.2v to -37v. this regulator requires only two external resistor to set the output voltag e. included on the chip are current limiting, thermal over load protection and safe area compensation. to-220 1. adj 2. input 3. output 1 internal block diagram 1 voltage reference - + 2 protection circuitry 3 output input vadj ka337 3-terminal 1.5a negative adjustable regulator
ka337 2 absolute maximum ratings electrical characteristics (v i - v o = 5v, i o = 40ma, 0 c t j +125 c, p dmax = 20w, unless otherwise specified) note: 1. load and line regulation are specified at co nstant junction temperature. change in v o due to heating effects must be taken into account se parately. pulse testi ng with low duty is used. 2. c adj , when used, is connected between the adjustment pin and ground. parameter symbol value unit input-output voltage differential iv i - v o i40 v power dissipation p d internally limited w operating temperature range t opr 0 ~ +125 c storage temperature range t stg -65 ~ +125 c parameter symbol conditions min. typ. max. unit line regulation (note1) r line t a = +25 c 3v i v i - v o i 40v - 0.01 0.04 %/ v 3v i v i - v o i 40v - 0.02 0.07 load regulation (note1) r load t a = +25 c 10ma i o 0.5a -1550 mv 10ma i o 1.5a - 15 150 adjustable pin current i adj --50100 a adjustable pin current change i adj t a =+25 c 10ma i o 1.5a 3v i v i - v o i 40v -25 a reference voltage v ref t a =+25 c -1.213 -1.250 -1.287 v 3v i v i - v o i 40v 10ma i o 1.5a -1.200 -1.250 -1.300 temperature stability st t 0 c tj + 125 c - 0.6 - % minimum load current to maintain regulation i l(min) 3v i v i - v o i 40v - 2.5 10 ma 3v i v i - v o i 10v - 1.5 6 rms noise, % of v out e n t a =+25 c 10hz f 10khz - 0.003 - % ripple rejection ratio rr v o = -10v, f = 120hz - 60 - db c adj = 10 f (note2) 66 77 - long term stability st t j = 125 c ,1000hours - 0.3 1 % thermal resistance junction to case r jc --4- c/w
ka337 3 typical application figure 1. programmable regulator ? ci is required if regulator is located more then 4 inches from power supply filter. a 1.0 f solid tantalum or 10 f aluminum electrolytic is recommended. co is necessary for stability. a 1.0 f solid tantalum or 10 f aluminum electroly tic is recommended. ?v o = -1.25v (1+r 2 /r 1 ) ka337 -vo -vi + co 1uf c i 0.1uf r 2 r 1 iadj vi vo + i prog vadj
ka337 4 mechanical dimensions package dimensions in millimeters 4.50 0.2 0 9.90 0.20 1.52 0.10 0.80 0.10 2.40 0.20 10.00 0.20 1.27 0.10 ?.60 0.10 (8.70) 2.80 0.10 15.90 0.20 10.08 0.30 18.95max. (1.70) (3.70) (3.00) (1.46) (1.00) (45 ) 9.20 0.20 13.08 0.20 1.30 0.10 1.30 +0.1 0 ?.0 5 0.50 +0.10 ?.05 2.54typ [2.54 0.20 ] 2.54typ [2.54 0.20 ] to-220
ka337 5 ordering information product number package operating temperature ka337 to-220 0 c to +125 c
ka337 8/23/10 0.0m 001 stock#ds400010 ? 2010 fairchild semiconductor corporation life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain lif e, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in an y component of a life support device or system whose fa ilure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes with out further notice to any products herein to improve re liability, function or design. fairchild does not assume any liability arising out of the applic ation or use of any product or circuit described herein; neither does it convey any license under its pat ent rights, nor the rights of others.
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