ADP2380-EVALZ Analog Devices, ADP2380-EVALZ Datasheet - Page 19

• Manufacturer Part Number: ADP2380-EVALZ
• Description: Power Management IC Development Tools 20V 4A Evaluation Board
• Manufacturer: Analog Devices
• Type: DC/DC Converters, Regulators & Controllersr
• Series: ADP2380r

Specifications of ADP2380-EVALZ

• Rohs: yes
• Tool Is For Evaluation Of: ADP2380
• Input Voltage: 4.5 V to 20 V
• Factory Pack Quantity: 1

Data Sheet
Use the following design guidelines to select the R
compensation components:
•
•
•
•
Compensation Network Between COMP and FB
The compensation RC network can also be placed between
COMP and FB, as shown in Figure 34.
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.
Figure 34. Small Signal Circuit with Compensation Network Between COMP
R
R
TOP
BOT
V
Determine the cross frequency, f
f
R
where:
V
g
Place the compensation zero at the domain pole, f
be determined by
C
by the ESR of the output capacitors.
OUT
C
R
C
SW
m
C
REF
CP
C
C
CP
/12 and f
= 470 µS.
can be calculated by
=
=
is optional, and it can be used to cancel the zero caused
= 0.6 V.
=
(
2
FB
R
×
R
+
π
ESR
V
R
R
×
C_EA
ADP2380
REF
ESR
V
R
GND
SW
×
R
OUT
C
C
C
C
–
+
/6.
CP_EA
)
g
×
×
OUT
m
g
×
C
m
C
OUT
C
C_EA
×
OUT
A
VI
COMP
×
and FB
f
V
C
COMP
+
–
C
. Generally, fc is between
A
VI
R
C
ESR
OUT
C
, C
C
P
, and C
. C
R
V
OUT
C
can
Rev. 0 | Page 19 of 28
CP
Assuming that the compensation networks of Figure 33 and
Figure 34 have the same pole and zero,
where:
r
amplifier, 40 MΩ.
Solve the preceding equations to obtain
where:
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0
is the equivalent output impedance of the transconductance
ADP2380
C
C
R
r
R
r
(
R
R
B
A
r
0
0
C
0
C
C
TOP
C
C
CP
R
(
=
=
(
CP
C
C
_
_
_
C
C
_
EA
EA
EA
(
1
C
C
CP
_
EA
CP
r
//
R
0
EA
+
C
=
C
TOP
=
=
(
R
+
_
C
=
C
C
g
R
EA
BOT
is supported by the ADIsimPower™ design tool
C
+
B
B
_
CP
CP
m
C
(
//
EA
C
C
C
B
+
×
(
_
+
R
=
A
)
EA
C
+
C
=
C
C
g
+
+
R
BOT
_
_
CP
+
C
r
r
C
C
m
R
C
0
0
EA
EA
R
R
_
R
C
C
R
C
r
_
R
TOP
−
C
C
)(
0
EA
)(
_
C
)
C
EA
TOP
C
C
C
)
1
EA
C
(
_
)
R
C
(
C
B
EA
+
+
C
+
R
TOP
R
)(
−
C
=
+
C
TOP
R
g
R
BOT
r
r
C
CP
0
m
C
0
C
BOT
R
//
CP
R
_
+
_
C
×
//
R
C
EA
EA
C
_
C
A
r
R
BOT
EA
0
C
C
C
)
C
BOT
)
g
)(
C
CP
C
+
m
_
)(
r
CP
0
C
_
EA
)(
1
EA
+
C
1
+
+
_
+
A
+
EA
g
)
g
m
m
×
×
r
r
0
ADP2380
0
)
)