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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)： | 9/11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
9
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
2. Choose the compensation capacitor (C3) to
achieve the desired phase margin. For
applications with typical inductor values, setting
the compensation zero, f
Z1
, below 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
>
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 340KHz switching
frequency, or the following relationship is valid:
2
f
R
2
C
2
1
S
ESR
<
×
×
π
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.
MP1570
SW
BS
10nF
5V
MP1570_F02
Figure 2—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.
TYPICAL APPLICATION CIRCUITS
INPUT
4.75V to 23V
OUTPUT
2.5V
3A
C3
3.3nF
C6
(optional)
D1
B130
(optional)
C5
10nF
MP1570
BS
IN
FB
SW
1
3
5
6
4
8
7
2
SS
GND
COMP
EN
MP1570_F03
Figure 3—MP1570 with AVX 47μF, 6.3V Ceramic Output Capacitor
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