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MP2354 – 2A, 23V, 380KHz STEP-DOWN CONVERTER
MP2354 Rev. 1.4
1/6/2006
www.MonolithicPower.com
9
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
In this case, a third pole set by the
compensation
capacitor
compensation
resistor
compensate the effect of the ESR zero on the
loop gain. This pole is located at:
(C6)
and
used
the
to
(R3)
is
3
R
6
C
2
1
f
3
P
×
×
π
=
The goal of compensation design is to shape
the converter transfer function to get a desired
loop gain. The system crossover frequency
where the feedback loop has the unity gain is
important. Lower crossover frequencies result
in slower line and load transient responses,
while higher crossover frequencies could cause
system unstable. A good rule of thumb is to set
the crossover frequency to approximately one-
tenth of the switching frequency. Switching
frequency for the MP2354 is 380KHz, so the
desired crossover frequency is around 38KHz.
Table 4 lists the typical values of compensation
components for some standard output voltages
with various output capacitors and inductors.
The values of the compensation components
have
been
optimized
responses
and
good
conditions.
for
stability
fast
transient
at
given
Table 4—Compensation Values for Typical
Output Voltage/Capacitor Combinations
V
OUT
2.5V
L1
C2
R3
C3
C6
10μH
min.
15μH
min.
15μH
min.
22μH
min.
10μH
min.
15μH
min.
15μH
min.
22μH
min.
22μF
Ceramic
22μF
Ceramic
22μF
Ceramic
22μF
Ceramic
560μF Al.
30m
ESR
560μF Al
30m
ESR
470μF Al.
30m
ESR
220μF Al.
30m
ESR
5.6k
4.7nF
None
3.3V
7.5k
3.3nF
None
5V
11k
2.2nF
None
12V
27k
1nF
None
2.5V
140k
1nF
120pF
3.3V
187k
1nF
82pF
5V
237k
1nF
56pF
12V
267k
1nF
22pF
To optimize the compensation components for
conditions not listed in Table 4, the following
procedure can be used.
1) Choose the compensation resistor (R3) to
set the desired crossover frequency. Determine
the R3 value by the following equation:
FB
OUT
V
CS
EA
C
V
G
G
f
2
C
×
2
3
R
×
×
×
π
=
2) Choose the compensation capacitor (C3) to
achieve the desired phase margin. For
applications with typical inductor values, setting
the compensation zero, f
Z1
, to less than one
forth of the crossover frequency provides
sufficient phase margin. Determine the C3
value by the following equation:
C
f
3
R
2
4
3
C
×
×
π
>
Where R3 is the compensation resistor value.
3) Determine if the second compensation
capacitor (C6) is required. It is required if the
ESR zero of the output capacitor is located at
less than half of the 380KHz switching
frequency, or the following relationship is valid:
2
f
R
2
C
2
1
S
ESR
<
×
×
π
If this is the case, then add the second
compensation capacitor (C6) to set the pole f
P3
at the location of the ESR zero.
Determine the C6 value by the equation:
3
R
R
2
C
6
C
ESR
×
=
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