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AN3028 датащи(PDF) 25 Page - STMicroelectronics

номер детали AN3028
подробное описание детали  demonstration board using the VIPer16LN
PDF  37 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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AN3028 датащи(HTML) 25 Page - STMicroelectronics

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AN3028
Guidelines for feedback loop calculation
Doc ID 16135 Rev 1
25/37
8
Guidelines for feedback loop calculation
8.1
Transfer function
The set PWM modulator + power stage is referred to as the “power plant” and is indicated by
G1(f), while C(f) is the “controller”, i.e. the network which is in charge of ensuring the stability
of the system.
Figure 28.
Control loop block diagram
The mathematical expression of the power plant G1(f) is the following:
Equation 2
where fp is the pole due to the output load and fz the zero due to the ESR of the output
capacitor:
Equation 3
Equation 4
)
fp
f
j
(1
)
Vdc
,
fsw
(
Ipkp
)
fz
f
j
(1
Vo
)
p
f
2
j
(1
)
Vdc
,
fsw
(
Ipkp
)
z
f
2
j
(1
Vo
=
I
V
(f)
pk
O
1
⋅
+
⋅
⋅
+
⋅
=
⋅
π
⋅
⋅
+
⋅
⋅
π
⋅
⋅
+
⋅
Δ
Δ
=
G
2ESR)
+
·(R
C
1
fp
OUT
OUT
⋅
π
=
·ESR
C
2
1
fz
OUT
⋅
π
⋅
=



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