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ADP2323ACPZ-R7 bảng dữ liệu(PDF) 22 Page - Analog Devices

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ADP2323
Data Sheet
Rev. A | Page 22 of 32
RESR is the equivalent series resistance of the output capacitor.
The ADP2323 uses a transconductance amplifier for the error
amplifier to compensate the system. Figure 47 shows the
simplified peak current-mode control small signal circuit.
RESR
R
+
–
g
m
RC
CCP
COUT
CC
RTOP
RBOT
–
+
AVI
VOUT
VCOMP
VOUT
Figure 47. Simplified Peak Current-Mode Control Small Signal Circuit
The compensation components, RC and CC, contribute a zero,
and the optional CCP and RC contribute an optional pole.
The closed-loop transfer equation is as follows:
)
(
1
1
)
(
s
G
s
C
C
C
C
R
s
s
C
R
C
C
g
R
R
R
s
T
vd
CP
C
CP
C
C
C
C
CP
C
m
TOP
BOT
BOT
V
×


×
+
×
×
+
×
×
×
+
×
+
−
×
+
=
The following design guideline shows how to select the
compensation components, RC, CC, and CCP, for ceramic output
capacitor applications.
1. Determine the cross frequency (fC). Generally, the fC is
between fSW/12 and fSW/6.
2. RC can be calculated using the following equation:
VI
m
C
OUT
OUT
C
A
g
f
C
V
R
×
×
×
×
×
π
×
=
V
6
.
0
2
3. Place the compensation zero at the domain pole (fP).
CC can be determined by
(
)
C
OUT
ESR
C
R
C
R
R
C
×
+
=
4. CCP is optional. It can be used to cancel the zero caused by
the ESR of the output capacitor.
C
OUT
ESR
CP
R
C
R
C
×
=
The ADP2323 has a 10 pF capacitor internally at the
COMPx pin; therefore, if CCP is smaller than 10 pF, no
external capacitor is needed.



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