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參數(shù)資料
| 型號(hào)： | EV2358DS-00A |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 2A, 23V, 370KHz Step-Down Converter |
| 中文描述： | 2A條，為23V，370KHz降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/9頁 |
| 文件大?。?/td> | 291K |
| 代理商： | EV2358DS-00A |
MP2358 – 2A, 23V, 370KHz STEP-DOWN CONVERTER
MP2358 Rev. 1.3
3/23/2006
www.MonolithicPower.com
8
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 the system
to become unstable. A good rule of thumb is to
set the crossover frequency to below one-tenth
of the switching frequency. To optimize the
compensation
components,
procedure can be used:
the
following
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,
which is typically less than one tenth of the
switching frequency.
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 below one forth
of the crossover frequency provides sufficient
phase margin. Determine the C3 value by the
following equation:
C
f
3
R
2
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 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 boost 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
MP2358 regulator. The bootstrap diode can be
a low cost one such as IN4148 or BAT54.
MP2358
SW
BS
10nF
5V
MP2358_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.
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| EV2359DJ-00B | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:1.2A, 24V, 1.4MHz Step-Down Converter in a TSOT23-6 |
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| EV2363DN-00A | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:3A, 27V, 365KHz Step-Down Converter |
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