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ADP2389 датащи(PDF) 16 Page - Analog Devices

номер детали ADP2389
подробное описание детали  18 V, 12 A Step-Down Regulator with Programmable Current Limit
PDF  23 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

ADP2389 датащи(HTML) 16 Page - Analog Devices

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ADP2389/ADP2390
Data Sheet
The ADP2389/ADP2390 use a transconductance amplifier for the
error amplifier and to compensate the system. Figure 31 shows
the simplified, peak current mode control, small signal circuit.
Figure 31. 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
P
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, fC is between
fSW/12 and fSW/6.
2. Calculate RC using the following equation:
VI
m
C
OUT
OUT
C
A
g
f
C
V
R
×
×
×
×
×
×
=
V
6
.
0
2 π
3. Place the compensation zero at the domain pole, fP, and
determine CC by
()
ESR
OUT
C
C
R R
C
C
R
+×
=
4. CCP is optional. Use CCP to cancel the zero caused by the
ESR of the output capacitor.
ESR
OUT
CP
C
RC
C
R
×
=
RESR
R
+
–
RC
CCP
COUT
CC
RTOP
RBOT
AVI
VOUT
VCOMP
VOUT
gm
–
+
Rev. 0 | Page 16 of 23



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