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AN4164 Datasheet(PDF) 25 Page - STMicroelectronics

Part # AN4164
Description  This document describes a 12 V-350 mA power supply set in non-isolated flyback topology
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4164 Datasheet(HTML) 25 Page - STMicroelectronics

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AN4164
Feedback loop calculation guidelines
Doc ID 023660 Rev 1
25/38
At this point the bode diagram of G1(f)*C(f) can be plotted, in order to check the phase
margin for the stability. If the margin is not high enough, another choice for fZc, fPc and
fcross_sel should be made, and the procedure repeated. When the stability is ensured, the
next step is to find the values of the schematic components, which can be calculated, using
the above formulas, as follows:
Equation 10
Equation 11
Equation 12
Equation 13
1
3
.
3
−
=
V
Vout
RfbH
RfbL
Rf bH
RfbL
RfbL
C
Gm
fPc
fZc
Cp
+
⋅
⋅
=
0
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
⋅
=
1
fZc
fPc
Cp
Cc
Cp
Cc
fPc
Cp
Cc
Rc
⋅
⋅
⋅
⋅
+
=
π
2



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