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AN4116 Datasheet(PDF) 26 Page - STMicroelectronics

Part # AN4116
Description  This document describes a 12 V-350 mA power supply
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4116 Datasheet(HTML) 26 Page - STMicroelectronics

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Feedback loop calculation guidelines
AN4116
26/38
Doc ID 023220 Rev 1
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, an alternative choice should be
made for fZc, fPc and fcross_sel, 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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