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ADP2325ACPZ-R7 bảng dữ liệu(PDF) 23 Page - Analog Devices

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ADP2325ACPZ-R7 bảng dữ liệu(HTML) 23 Page - Analog Devices

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Data Sheet
ADP2325
Rev. 0 | Page 23 of 32
The ADP2325 uses a transconductance amplifier for the error
amplifier to compensate the system. Figure 51 shows the
simplified peak current mode control small signal circuit.
Figure 51. 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:
(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
×


×
+
×
×
+
×
×
×
+
×
+
−
×
+
=
1
1
The following design guidelines show how to select the compen-
sation components, RC, CC, and CCP, for ceramic output capacitor
applications.
4. Determine the cross frequency (fC). Generally, the fC is
between fSW/12 and fSW/6.
5. RC can be calculated by using the following equation:
VI
m
C
OUT
OUT
C
A
g
f
C
V
R
×
×
×
×
×
×
=
V
6
.
0
2 π
6. Place the compensation zero at the domain pole (fP).
CC can be determined by
(
)
C
OUT
ESR
C
R
C
R
R
C
×
+
=
7. 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 ADP2325 has an internal 10 pF capacitor at the COMPx
pin; therefore, if CCP is smaller than 10 pF, no external capacitor
is required.
RESR
R
+
–
g
m
RC
CCP
COUT
CC
RTOP
RBOT
–
+
AVI
VOUT
VCOMP
VOUT



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