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參數(shù)資料
| 型號(hào)： | EV2303DN-00A |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 3A, 28V, 340KHz Synchronous Rectified Step-Down Converter |
| 中文描述： | 第3A，28V的，340KHz的同步整流降壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 10/14頁(yè) |
| 文件大?。?/td> | 395K |
| 代理商： | EV2303DN-00A |
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MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
MP2303 Rev. 0.92
5/2/2006
www.MonolithicPower.com
10
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
In this case, a third pole set by the optional
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
instability. A good rule of thumb is to set the
crossover frequency to approximately one-tenth
of the switching frequency. Switching frequency
for the MP2303 is 340KHz, so the desired
crossover frequency is 34KHz.
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 for fast transient responses and
good stability at given conditions.
Table 3—Compensation Values for Typical
Output Voltage/Capacitor Combinations
V
OUT
1.8V 4.7μH
L
C2
R3
C3
C6
100μF
Ceramic
47μF Ceramic
5.6k
5.6nF
None
2.5V
4.7μH -
6.8μH
6.8μH -
10μH
10μH -
15μH
15μH -
22μH
4.7μH
3.65k
8.2nF
None
3.3V
22μFx2
Ceramic
22μFx2
Ceramic
22μFx2
Ceramic
100μF/100m
SP-CAP
47μF
SP-CAP
47μF
SP-CAP
47μF
SP CAP
560μF Al.
30m
ESR
560μF Al.
30m
ESR
470μF Al.
30m
ESR
220μF Al.
30m
ESR
4.42k
4.7nF
None
5V
6.98k
3.3nF
None
12V
16.5k
1.8nF
None
1.8
8.4k
2.2nF
None
2.5V
4.7μH -
6.8μH
6.8μH -
10μH
10μH -
15μH
4.7μH -
6.8μH
6.8μH -
10μH
10μH -
15μH
15μH -
22μH
5.6k
3.3nF
None
3.3V
6.8k
2.2nF
None
5V
10k
2.2nF
None
2.5V
10k
12nF
1.8nF
3.3V
10k
10nF
1.5nF
5V
15k
8.2nF
1nF
12V
15k
10nF
390pF
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