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| 型號： | MP2307 |
| 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)： | 7/11頁 |
| 文件大?。?/td> | 353K |
| 代理商： | MP2307 |
MP2307 – 3A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
MP2307 Rev. 1.7
3/14/2006
www.MonolithicPower.com
7
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
APPLICATIONS INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The output voltage is set using a resistive
voltage divider connected from the output
voltage to FB. The voltage divider divides the
output voltage down to the feedback voltage by
the ratio:
2
R
1
R
2
R
+
V
V
OUT
FB
=
Thus the output voltage is:
2
R
2
R
1
R
925
.
V
OUT
+
×
=
R2 can be as high as 100k
, but a typical value
is 10k
. Using the typical value for R2, R1 is
determined by:
)
925
.
V
(
81
.
10
1
R
OUT
×
=
(k
)
For example, for a 3.3V output voltage, R2 is
10k
, and R1 is 26.1k
. Table 1 lists
recommended resistance values of R1 and R2
for standard output voltages.
Table 1—Recommended Resistance Values
VOUT
1.8V
2.5V
3.3V
5V
12V
R1
R2
10k
10k
10k
10k
10k
9.53k
16.9k
26.1k
44.2k
121k
Inductor
The inductor is required to supply constant
current to the load while being driven by the
switched input voltage. A larger value inductor
will result in less ripple current that will in turn
result in lower output ripple voltage. However,
the larger value inductor will have a larger
physical size, higher series resistance, and/or
lower saturation current. A good rule for
determining inductance is to allow the peak-to-
peak ripple current to be approximately 30% of
the maximum switch current limit. Also, make
sure that the peak inductor current is below the
maximum switch current limit.
The inductance value can be calculated by:
×
×
=
IN
OUT
V
L
S
OUT
V
V
1
I
f
L
Where V
OUT
is the output voltage, V
IN
is the
input voltage, f
S
is the switching frequency, and
I
L
is the peak-to-peak inductor ripple current.
Choose an inductor that will not saturate under
the maximum inductor peak current, calculated
by:
×
×
×
+
=
IN
OUT
V
S
OUT
f
LOAD
I
LP
I
V
1
L
2
V
Where I
LOAD
is the load current.
The choice of which style inductor to use mainly
depends on the price vs. size requirements and
any EMI constraints.
Optional Schottky Diode
During the transition between the high-side
switch and low-side switch, the body diode of
the low-side power MOSFET conducts the
inductor current. The forward voltage of this
body diode is high. An optional Schottky diode
may be paralleled between the SW pin and
GND pin to improve overall efficiency. Table 2
lists example Schottky diodes and their
Manufacturers.
Table 2—Diode Selection Guide
Part Number
Voltage/Current
Rating
30V, 1A
30V, 1A
Vendor
B130
SK13
Diodes, Inc.
Diodes, Inc.
International
Rectifier
MBRS130
30V, 1A
Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required
to supply the AC current while maintaining the
DC input voltage. Use low ESR capacitors for
the best performance. Ceramic capacitors are
preferred, but tantalum or low-ESR electrolytic
capacitors will also suffice.
Choose X5R or
X7R dielectrics when using ceramic capacitors.
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| 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 |
| 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(fēng)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(fēng)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(fēng)格:SMD/SMT |
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