l2720/2/4 july 2003 low drop 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 . low input offset voltage . ground compatible inputs . low saturation voltage . thermal shutdown . clamp diode description the l2720, l2722 and l2724 are monolithic inte- grated circuits in powerdip, minidip and sip-9 pack- ages, intended for use as power operational ampli- fiers in a wide range of applications including servo amplifiers and power supplies. they are particularly indicated for driving, inductive loads, as motor and finds applications in compact- disc vcr automotive, 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 (plastic) sip9 ordering numbers : l2720 (powerdip) l2722 (minidip) l2724 (sip9) 1/10 pin connections (top views) l2720 l2722 l2724
block diagram l2720 l2722 l2724 schematic diagram (one section) absolute maximum ratings symbol parameter value unit v s supply voltage 28 v v s peak supply voltage (50ms) 50 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 o c (l2720), t amb = 50 o c (l2722) t case = 75 o c (l2720) t case = 50 o c (l2724) 1 5 10 w t stg , t j storage and junction temperature C40 to 150 o c l2720/2/4 2/10
thermal data sip-9 powerdip minidip r th j-case thermal resistance junction-case max. 10 o c/w 15 o c/w 70 o c/w r th j-amb thermal resistance junction-ambient max. 70 o c/w 70 o c/w 100 o c/w electrical characteristics v s = 24v, t amb = 25 o c unless otherwise specified symbol parameter test conditions min. typ. max. unit v s single supply voltage 4 28 v v s split supply voltage 2 14 v i s quiescent drain current v o = v s 2 v s = 24v 10 15 ma v s = 8v 9 15 i b input bias current 0.2 1 m a v os input offset voltage 10 mv i os input offset current 100 na sr slew rate 2 v/ m s b gain-bandwidth product 1.2 mhz r i input resistance 500 k w g v o.l. voltage gain f = 100hz f = 1khz 70 80 60 db e n input noise voltage b = 22hz to 22khz 10 m v i n input noise voltage 200 pa cmr common mode rejection f = 1khz 66 84 db svr supply voltage rejection f = 100hz v s = 24v r g = 10k w v s = 12v v r = 0.5v v s = 6v 60 70 75 80 db v drop(high) v s = 2.5v to 12v i p = 100ma i p = 500ma 0.7 11.5 v v drop(low) v s = 2.5v to 12v i p = 100ma i p = 500ma 0.3 0.5 1 v c s channel separation f = 1khz v s = 24v r l = 10 w v s = 6v g v = 30db 60 60 db t sd thermal shutdown junction temperature 145 o c figure 1 : quiescent current vs. supply voltage figure 2 : open loop gain vs. frequency l2720/2/4 3/10
figure 3 : common mode rejection vs. frequency figure 4 : output swing vs. load current (v s = 5 v. figure 5 : output swing vs. load current (v s = 12 v. figure 6 : supply voltage rejection vs. frequency figure 7 : channel separation vs. frequency l2720/2/4 4/10
application suggestion 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 connected between supply pins and ground ; - boucherot cell (0.1 to 0.2 m f + 1 w series) be- tween outputs and ground or across the load. with single supply operation, a resistor (1k w ) between the output and supply pin can be necessary for stability. figure 8 : bidirectional dc motor control with m p compatible inputs v s1 = logic supply voltage must be v s2 > v s1 e1, e2 = logic inputs figure 9 : servocontrol for compact-disc figure 10 : capstan motor control in video recorders figure 11 : motor current control circuit note : the input voltage level is compatible with l291 (8 - bit d/a converter) l2720/2/4 5/10
figure 12 : bidirectional speed control of dc motors 2r3 . r1 for circuit stability ensure that r x > where r m = internal resistance of motor. rm v s 2r3 . r1 the voltage available at the terminals of the motor is v m = 2 (v i - ) + |r o |. i m where |r o | = 2 r x and i m is the motor current. figure 13 : vhs-vcr motor control circuit l2720/2/4 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 l2720/2/4 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 l2720/2/4 8/10
sip9 dim. mm inch min. typ. max. min. typ. max. a 7.1 0.280 a1 2.7 3 0.106 0.118 b230.90 b3 24.8 0.976 b1 0.5 0.020 b3 0.85 1.6 0.033 0.063 c 3.3 0.130 c1 0.43 0.017 c2 1.32 0.052 d 21.2 0.835 d1 14.5 0.571 e 2.54 0.100 e3 20.32 0.800 l 3.1 0.122 l1 3 0.118 l2 17.6 0.693 l3 0.25 0.010 l4 17.4 17.85 0.685 0,702 m 3.2 0.126 n 1 0.039 p 0.15 0.006 d n m l1 19 d1 l3 l2 la1 e3 b3 b1 b ec 1 a c2 c p l4 sip9 b3 outline and mechanical data l2720/2/4 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 l2720/2/4 10/10
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