MSS1048-152NL AD [Analog Devices], MSS1048-152NL Datasheet - Page 23

• Manufacturer Part Number: MSS1048-152NL
• Description: Dual 5 A, 20 V Synchronous Step-Down
• Manufacturer: AD [Analog Devices]

Data Sheet
The
amplifier to compensate the system. Figure 51 shows the
simplified peak current mode control small signal circuit.
The compensation components, R
and the optional C
The closed-loop transfer equation is as follows:
T
R
R
V
TOP
BOT
(s)
Figure 51. Simplified Peak Current Mode Control Small Signal Circuit
V
ADP2325
OUT
=
R
BOT
R
BOT
+
uses a transconductance amplifier for the error
R
+
–
g
TOP
m
C
CP
R
C
C
×
and R
C
C
V
−
+
COMP
g
C
C
m
C
CP
contribute an optional pole.
CP
×
+
–
s
C
×
and C




1
A
VI
+
1
+
R
C
C
R
, contribute a zero,
C
×
C
C
×
C
+
C
C
C
C
R
C
×
OUT
ESR
CP
×
C
s
CP
×
s
R
V




OUT
×
Rev. 0 | Page 23 of 32
G
VD
(s)
The following design guidelines show how to select the compen-
sation components, R
applications.
4.
5.
6.
7.
The
pin; therefore, if C
is required.
ADP2325
Determine the cross frequency (f
between f
R
Place the compensation zero at the domain pole (f
C
C
the ESR of the output capacitor.
C
C
R
C
C
CP
C
C
CP
can be calculated by using the following equation:
can be determined by
=
=
is optional. It can be used to cancel the zero caused by
=
2
(
R
R
×
ESR
+
π
SW
has an internal 10 pF capacitor at the COMPx
0
R
×
6 .
R
/12 and f
×
ESR
V
C
R
V
C
CP
OUT
C
OUT
)
×
C
is smaller than 10 pF, no external capacitor
×
, C
g
C
×
m
C
OUT
C
, and C
SW
×
OUT
A
/6.
VI
×
CP
f
C
, for ceramic output capacitor
C
). Generally, the f
ADP2325
P
).
C
is