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AN557 датащи(PDF) 16 Page - STMicroelectronics

номер детали AN557
подробное описание детали  EASY APPLICATION DESIGN WITH THE L4970A
PDF  52 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN557 датащи(HTML) 16 Page - STMicroelectronics

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AN557 APPLICATION NOTE
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Figure 15. Compensation network of the error amplifier
The Bode diagram is shown in fig.16.
Figure 16. Bode plot showing gain and phase of compensated error amplifier
The compensation circuit introduces a pole at low frequency and a zero that is generally calculated to be
put in the proximity of the resonance frequency of the output LC filter.
The second pole at high frequency generally falls in a zone of no interest (for the system stability, one must
consider the zero introduced by ESR characteristic of the output capacitor. Not all the designers agree on
this solution).
If necessary, however, one can turn to more sophisticated compensation circuitry. An example is shown
in fig. 17.
Figure 17. One pole, two zero compensation network
Such a circuit introduces a pole at low-frequency and two zeros.
17
Z1
1
2
Π R1 C1
-----------------------------
Z2
1
2
Π R2 C2
-----------------------------
=
=



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