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LM221 датащи(PDF) 7 Page - National Semiconductor (TI) |
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LM221 датащи(HTML) 7 Page - National Semiconductor (TI) |
7 / 10 page Frequency Compensation UNIVERSAL COMPENSATION The additional gain of the LM321 preamplifier when used with an operational amplifier usually necessitates additional frequency compensation When the closed loop gain of the op amp with the LM321 is less than the gain of the LM321 alone more compensation is needed The worst case situa- tion is when there is 100% feedbacksuch as a voltage follower or integratorand the gain of the LM321 is high When high closed loop gains are usedfor example AV 1000and only an addition gain of 200 is inserted by the LM321 the frequency compensation of the op amp will usu- ally suffice The frequency compensation shown here is designed to op- erate with any unity-gain stable op amp Figure 1 shows the basic configuration of frequency stabilizing network In oper- ation the output of the LM321 is rendered single ended by a 001 mF bypass capacitor to ground Overall frequency com- pensation then is achieved by an integrating capacitor around the op amp Bandwidth at unity-gain j 12 2qRSETC for 05 MHz bandwidth C 4 106RSET For use with higher frequency op amps such as the LM118 the bandwidth may be increased to about 2 MHz If the closed loop gain is greater than unity ‘‘C’’ may be decreased to C 4 106 ACL RSET ALTERNATE COMPENSATION The two compensation capacitors can be made equal for improved power supply rejection In this case the formula for the compensation capscitor is C 8 106 ACL RSET Table I shows typical values for the two compensating ca- pacitors for various gains and operating currents TABLE I Closed Current Set Resistor Loop Gain 120 kX 60 kX 30 kX 12 kX 6kX AV 1 68 130 270 680 1300 AV 5 15 27 56 130 270 AV 10 10 15 27 68 130 AV 50 1 3 5 15 27 AV 100 – 1 3 5 10 AV 500 – – 1 1 3 AV 1000 – – – – – This table applies for the LM108 LM101A LM741 LM118 Capacitance is in pF DESIGN EQUATIONS FOR THE LM321 SERIES Gain AV 12 c 106 RSET Null Pot Value should be 10% of RSET Operating Current 2 c 065V RSET Positive Common-Mode Limit Va b 06 b 065V c 50k RSET ( Typical Applications Offset adjust See table for frequency compensation TLH7769 2 FIGURE 1 Low Drift Op Amp Using the LM321A as a Preamp 7 |
Аналогичный номер детали - LM221 |
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Аналогичное описание - LM221 |
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