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參數(shù)資料
| 型號： | EV2355DN-00A |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 3A, 23V, 380KHz Step-Down Converter |
| 中文描述： | 第3A，為23V，380KHz降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 9/10頁 |
| 文件大小： | 262K |
| 代理商： | EV2355DN-00A |
MP2355 – 3A, 23V, 380KHz STEP-DOWN CONVERTER
MP2355 Rev. 1.5
5/1/2006
www.MonolithicPower.com
9
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
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 MP2355 is 380KHz, so the desired
crossover frequency is around 38KHz.
Table 3 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 3—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
3.9k
5.6nF
None
3.3V
4.7k
4.7nF
None
5V
7.5k
2.7nF
None
12V
15k
1.5nF
None
2.5V
100k
1nF
150pF
3.3V
120k
1nF
120pF
5V
150k
1nF
82pF
12V
169k
1nF
39pF
To optimize the compensation components for
conditions not listed in Table 2, 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
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:
phase
margin.
For
C
f
3
R
2
4
3
C
×
×
π
>
Where R3 is the compensation resistor value and
f
C
is the desired crossover frequency, 38KHz.
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
×
=
External Bootstrap Diode
It is recommended that an external bootstrap
diode be added when the system has a 5V
fixed input or the power supply generates a 5V
output. This helps improve the efficiency of the
regulator. The bootstrap diode can be a low
cost one such as IN4148 or BAT54.
MP2355
SW
BS
10nF
5V
MP2355_F03
Figure 3—External Bootstrap Diode
This diode is also recommended for high duty
cycle operation (when
IN
OUT
V
V
>65%) and high
output voltage (V
OUT
>12V) applications.
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