參數(shù)資料
型號： MP2307_06
廠商： Monolithic Power Systems, Inc.
英文描述： 3A, 23V, 340KHz Synchronous Rectified Step-Down Converter
中文描述： 第3A，為23V，340KHz的同步整流降壓轉(zhuǎn)換器
文件頁數(shù)： 9/11頁
文件大小： 353K
代理商： MP2307_06
MP2307 – 3A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
MP2307 Rev. 1.7
3/14/2006
www.MonolithicPower.com
9
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
The system has one zero of importance, due to the
compensation capacitor (C3) and the compensation
resistor (R3). This zero is located at:
3
R
3
C
2
1
f
1
Z
×
×
π
=
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, 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
system instability. A good standard is to set the
crossover frequency below one-tenth of the
switching frequency.
To optimize the compensation components, the
following procedure can be used.
1. Choose the compensation resistor (R3) to set
the desired crossover frequency.
Determine R3 by the following equation:
FB
OUT
V
CS
EA
S
FB
OUT
V
CS
EA
C
f
V
G
G
f
1
2
C
2
V
G
G
2
C
×
2
3
R
×
×
×
×
×
π
<
×
×
×
π
=
Where f
C
is the desired crossover frequency
which is typically below 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
) below one-forth of
the crossover frequency provides sufficient
phase margin.
Determine C3 by the following equation:
C
f
3
R
2
4
3
C
×
×
π
>
Where R3 is the compensation resistor.
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 C6
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.
MP2307
SW
BS
10nF
5V
MP2307_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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MP2307DN 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:3A, 23V, 340KHz Synchronous Rectified Step-Down Converter
MP2307DN-LF 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3A/23V Synch Step-Down Converter RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
MP2307DN-LF-Z 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3A/23V Synch Step-Down Converter RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
MP2308GD-P 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 4A/18V Synch Step-Down Reg RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT
MP2308GD-Z 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 4A/18V Synch Step-Down Reg RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT
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