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AN487 Datasheet(PDF) 7 Page - STMicroelectronics |
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AN487 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 13 page 7/13 AN487 APPLICATION NOTE Neglecting the high frequency behavior (in the hy-potesis that in the overall frequency compensation of the loop the second pole of the operational amplifier is far below the 0 dB axis), we can make a first order approx. by which the error amplifier can be schematized by the equivalent circuit of fig.12. Figure 12. Error amplifier equivalent circuit. by which where Co = 3pF. The error amplifier is inserted in the regulation loop and can be easily compensated, thanks to its high output impedance, with a network between its output and ground. The typical compensated network is shown in fig.13. Figure 13. Compensation network of the error amplifier. The transfer function is: In the hypotesis that Rc<Ro and Cc>Co, the Bode diagram of the compensated amplifier is reported (see fig.14). Figure 14. Bode plot showing gain and phase of compensated error amplifier. A V s () G M R o 1SR o Co + ----------------------------- ⋅ = A V s () G v R o 1S Rc Co + () S 2 R o Co Rc Cc SR o Cc R o Co R c Cc ++ () 1 ++ ----------------------------------------------------------------------------------------------------------------------- ⋅ = |
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