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參數(shù)資料
| 型號： | MP1570DN |
| 廠商： | MONOLITHIC POWER SYSTEMS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3A, 23V, 340KHz Synchronous Rectified Step-Down Converter |
| 中文描述： | 3 A SWITCHING REGULATOR, 380 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 333K |
| 代理商： | MP1570DN |
MP1570 – 3A, 23V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
MP1570 Rev. 1.5
1/31/2006
www.MonolithicPower.com
8
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
The system may have another zero of
importance, if the output capacitor has a large
capacitance and/or a high ESR value. The zero,
due to the ESR and capacitance of the output
capacitor, is located at:
ESR
ESR
R
2
C
2
1
f
×
×
π
=
In this case (as shown in Figure 2), a third pole
set by the compensation capacitor (C6) and the
compensation
resistor
compensate the effect of the ESR zero on the
loop gain. This pole is located at:
(R3)
is
used
to
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 MP1570 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
L
C2
R3
C3
C6
4.7μH
100μF
Ceramic
47μF
Ceramic
22μFx2
Ceramic
22μFx2
Ceramic
22μFx2
Ceramic
100μF
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
5.6k
3.3nF
None
2.5V
4.7-
6.8μH
6.8-
10μH
10-
15μH
15-
22μH
4.7μH
4.7k
4.7nF
None
3.3V
5.6k
3.3nF
None
5V
7.5k
3.3nF
None
12V
10k
1.2nF
None
1.8
10k
2.2nF
100pF
2.5V
4.7-
6.8μH
6.8-
10μH
10-
15μH
4.7-
6.8μH
6.8-
10μH
10-
15μH
15-
22μH
5.6k
3.3nF
None
3.3V
6.8k
2.2nF
None
5V
10k
2.2nF
None
2.5V
10k
7.5nF
1.5nF
3.3V
10k
10nF
1.5nF
5V
15k
7.5nF
1nF
12V
15k
10nF 390pF
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
=
Where f
C
is the desired crossover frequency,
34KHz.
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