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l272 july 2003 dual power operational amplifiers ? . output current to 1 a . operates at low voltages . single or split supply . large common-mode and differen- tial mode range . ground compatible inputs . low saturation voltage . thermal shutdown description the l272 is a monolithic integrated circuits in pow- erdip, minidip and so packages intended for use as power operational amplifiers in a wide range of ap- plications including servo amplifiers and power sup- plies, compacts disc, vcr, etc. the high gain and high output power capability pro- vide superior performance whatever an operational amplifier/power booster combination is required. powerdip (8 + 8) minidip ordering numbers : l272 (powerdip) l272m (minidip) l272d (so16 narrow) pin connections (top view) so16 (narrow) l272d l272m 1/10
block diagrams schematic diagram (one only) l272 l272m l272d l272 2/10
absolute maximum ratings symbol parameter value unit v s supply voltage 28 v v i input voltage v s v i differential input voltage v s i o dc output current 1 a i p peak output current (non repetitive) 1.5 a p tot power dissipation at: t amb = 80 c (l272), t amb = 50 c (l272m), t case = 90 c (l272d) t case = 75 c (l272) 1.2 5 w w t op operating temperature range (l272d) C 40 to 85 c t stg , t j storage and junction temperature C 40 to 150 c electrical characteristics (v s = 24v, t amb = 25 o c unless otherwise specified) symbol parameter test conditions min. typ. max. unit v s supply voltage 4 28 v i s quiescent drain current v o = v s 2 v s = 24v v s = 12v 8 7.5 12 11 ma ma i b input bias current 0.3 2.5 m a v os input offset voltage 15 60 mv i os input offset current 50 250 na sr slew rate 1 v/ m s b gain-bandwidth product 350 khz r i input resistance 500 k w g v o. l. voltage gain f = 100hz f = 1khz 60 70 50 db db e n input noise voltage b = 20khz 10 m v i n input noise current b = 20khz 200 pa crr common mode rejection f = 1khz 60 75 db svr supply voltage rejection f = 100hz, r g = 10k w , v r = 0.5v v s = 24v v s = 12v v s = 6v 54 70 62 56 db v o output voltage swing i p = 0.1a i p = 0.5a 21 23 22.5 v v c s channel separation f = 1 khz; r l =10 w , g v = 30db v s = 24v v s = 6v 60 60 db d distortion f = 1khz, g v = 3 db, v s = 24v, r l = 0.5 % t sd thermal shutdown junction temperature 145 c thermal data symbol parameter powerdip so16 minidip unit r th j-case thermal resistance junction-pins max. 15 C * 70 o c/w r th j-amb thermal resistance junction-ambient max. 70 C 100 o c/w r th j-alumina thermal resistance junction-alumina max. C ** 50 C o c/w * thermal resistance junction-pin 4 ** thermal resistance junctions-pins with the chip soldered on the middle of an alumina supporting substrate measuring 15x 20mm; 0.65mm thickness and infinite heatsink. l272 3/10
figure 1 : quiescent current versus supply voltage figure 2 : quiescent drain current versus temperature figure 3 : open loop voltage gain figure 4 : output voltage swing versus load current figure 5 : output voltage swing versus load current figure 6 : supply voltage rejection versus frequency l272 4/10
figure 7 : channel separation versus frequency figure 8 : common mode rejection versus frequency application suggestion note in order to avoid possible instability occuring into fi- nal stage the usual suggestions for the linear power stages are useful, as for instance : - layout accuracy ; - a 100nf capacitor corrected between supply pins and ground ; - boucherot cell (0.1 to 0.2 m f + 1 w series) between figure 9 : bidirectional dc motor control with m p compatible inputs figure 10 : servocontrol for compact-disc figure 11 : capstan motor control in video recorders l272 5/10
figure 12 : motor current control circuit. note : the input voltage level is compatible with l291 (5-bit d/a converter). figure 13 : bidirectional speed control of dc motors. 2r3 r1 for circuit stability ensure that r x >where r m = internal resistance of motor. r m v s 2r r1 the voltage available at the terminals of the motor is v m = 2 (v i ) + ? r o ? i m where ? r o ? = 2r x and i m is the motor current. l272 6/10
dim. mm inch min. typ. max. min. typ. max. a1 0.51 0.020 b 0.85 1.40 0.033 0.055 b 0.50 0.020 b1 0.38 0.50 0.015 0.020 d 20.0 0.787 e 8.80 0.346 e 2.54 0.100 e3 17.78 0.700 f 7.10 0.280 i 5.10 0.201 l 3.30 0.130 z 1.27 0.050 powerdip 16 outline and mechanical data l272 7/10
outline and mechanical data dim. mm inch min. typ. max. min. typ. max. a 3.32 0.131 a1 0.51 0.020 b 1.15 1.65 0.045 0.065 b 0.356 0.55 0.014 0.022 b1 0.204 0.304 0.008 0.012 d 10.92 0.430 e 7.95 9.75 0.313 0.384 e2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 f 6.6 0.260 i 5.08 0.200 l 3.18 3.81 0.125 0.150 z 1.52 0.060 minidip l272 8/10
so16 narrow dim. mm inch min. typ. max. min. typ. max. a 1.75 0.069 a1 0.1 0.25 0.004 0.009 a2 1.6 0.063 b 0.35 0.46 0.014 0.018 b1 0.19 0.25 0.007 0.010 c 0.5 0.020 c1 45? (typ.) d (1) 9.8 10 0.386 0.394 e 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 8.89 0.350 f (1) 3.8 4 0.150 0.157 g 4.6 5.3 0.181 0.209 l 0.4 1.27 0.016 0.050 m 0.62 0.024 s (1) d and f do not include mold flash or protrusions. mold flash or potrusions shall not exceed 0.15mm (.006inch). outline and mechanical data 8?(max.) 0016020 weight: 0.20gr l272 9/10
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nse- quences of use of such information nor for any infringement of patents or other rights of third parties which may result from i ts use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specification mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmi- croelectronics products are not authorized for use as critical components in life support devices or systems without express wr itten approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics ? 2003 stmicroelectronics C printed in italy C all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia - malt a - morocco - singapore - spain - sweden - switzerland - united kingdom - united states. http://www.st.com l272 10/10
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