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ADP2380AREZ-R7 Datasheet(PDF) 19 Page - Analog Devices

Part # ADP2380AREZ-R7
Description  20 V, 4 A Synchronous Step-Down Regulator with Low-Side Driver
PDF  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP2380AREZ-R7 Datasheet(HTML) 19 Page - Analog Devices

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Data Sheet
ADP2380
Rev. 0 | Page 19 of 28
Use the following design guidelines to select the RC, CC, and CCP
compensation components:
•
Determine the cross frequency, fC. Generally, fc is between
fSW/12 and fSW/6.
•
RC can be calculated by
VI
m
REF
C
OUT
OUT
C
A
g
V
f
C
V
R
×
×
×
×
×
×
=
π
2
where:
VREF = 0.6 V.
gm = 470 µS.
•
Place the compensation zero at the domain pole, fP. CC can
be determined by
C
OUT
ESR
C
R
C
R
R
C
×
+
=
)
(
•
CCP is optional, and it can be used to cancel the zero caused
by the ESR of the output capacitors.
C
OUT
ESR
CP
R
C
R
C
×
=
Compensation Network Between COMP and FB
The compensation RC network can also be placed between
COMP and FB, as shown in Figure 34.
RESR
R
+
–
g
m
COUT
RTOP
RBOT
–
+
AVI
VOUT
VCOMP
VOUT
ADP2380
GND
COMP
FB
CCP_EA
RC_EA
CC_EA
Figure 34. Small Signal Circuit with Compensation Network Between COMP
and FB
When connecting the compensation network as shown in
Figure 34, it requires the same pole and zero as in Figure 33
to maintain the same compensation performance.
Assuming that the compensation networks of Figure 33 and
Figure 34 have the same pole and zero,
)
1
)(
//
)(
(
)
(
)
(
)
1
)(
//
(
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
0
m
BOT
TOP
EA
C
EA
CP
EA
C
EA
C
EA
C
EA
CP
0
C
C
C
CP
0
0
m
BOT
TOP
EA
CP
EA
C
EA
C
EA
CP
EA
C
EA
C
0
CP
C
C
0
m
EA
C
EA
CP
EA
C
EA
C
C
C
r
g
R
R
C
C
C
R
C
C
r
C
R
C
C
r
r
g
R
R
C
C
R
C
C
R
r
C
C
R
r
g
C
C
C
R
C
R
×
+
+
+
+
+
=
+
+
×
+
+
=
+
−
=
where:
r0 is the equivalent output impedance of the transconductance
amplifier, 40 MΩ.
BOT
TOP
BOT
TOP
BOT
TOP
R
R
R
R
R
R
+
=
//
Solve the preceding equations to obtain
)
)(
(
)
)(
(
_
_
_
_
A
r
C
R
B
C
C
R
r
C
C
C
R
B
R
A
r
C
R
B
C
C
R
r
g
B
C
0
C
C
CP
C
C
0
EA
CP
EA
C
C
C
EA
C
0
C
C
CP
C
C
0
m
EA
C
+
+
=
+
=
+
+
−
×
=
where:
)
(
1
)
(
)
1
)(
//
(
0
m
C
CP
0
0
m
BOT
TOP
r
A
g
C
C
r
B
r
g
R
R
A
+
+
+
=
×
+
=
ADIsimPOWER DESIGN TOOL
The ADP2380 is supported by the ADIsimPower™ design tool
set. ADIsimPower is a collection of tools that produce complete
power designs that are optimized for a specific design goal. The
tools enable the user to generate a full schematic and bill of
materials and calculate performance in minutes. ADIsimPower
can optimize designs for cost, area, efficiency, and parts count,
while taking into consideration the operating conditions and
limitations of the IC and all real external components. For
more information about the ADIsimPower design tools, visit
www.analog.com/ADIsimPower. The tool set is available from
this website, and users can request an unpopulated board.



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