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AN4116 bảng dữ liệu(PDF) 25 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  This document describes a 12 V-350 mA power supply
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AN4116 bảng dữ liệu(HTML) 25 Page - STMicroelectronics

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AN4116
Feedback loop calculation guidelines
Doc ID 023220 Rev 1
25/38
The mathematical expression of the compensator C(f) is:
Equation 5
where:
Equation 6
Equation 7
Equation 8
are chosen in order to ensure the stability of the overall system. Gm = 2 mA/V (typical) is the
VIPER06 transconductance.
7.2
Compensation procedure
The first step is to choose the pole and zero of the compensator and the crossing frequency,
for instance:
–
fZc = fp/2
–
fPc = fz
–
fcross = fcross_sel
≤fsw/10
G1(fcross_sel) can be calculated from
Equation 2 and, since by definition it is
| C(fcross_sel)*G1(fcross_sel)| = 1, C0 can be calculated as follows:
Equation 9
()
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