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參數(shù)資料
| 型號(hào)： | MP2305 |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 2A, 23V Synchronous Rectified Step-Down Converter |
| 中文描述： | 甲，為23V同步整流降壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 305K |
| 代理商： | MP2305 |
MP2305 – 2A, 23V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
MP2305 Rev. 1.7
4/17/2006
www.MonolithicPower.com
8
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
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 instability. A good rule of thumb 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 the R3 value 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 the C3 value 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 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.
MP2305
SW
BS
10nF
5V
MP2305_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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| MP2305DS | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:2A, 23V Synchronous Rectified Step-Down Converter |
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| MP2305DS-LF-Z | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2A/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(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MP2307 | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:3A, 23V, 340KHz Synchronous Rectified Step-Down Converter |
| MP2307_06 | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:3A, 23V, 340KHz Synchronous Rectified Step-Down Converter |
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