- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄371133 > MP2305 (Monolithic Power Systems, Inc.) 2A, 23V Synchronous Rectified Step-Down Converter PDF資料下載
參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 305K |
| 代理商： | MP2305 |
MP2305 – 2A, 23V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
MP2305 Rev. 1.7
4/17/2006
www.MonolithicPower.com
6
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 from the output voltage to FB
pin. 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
=
Where V
FB
is the feedback voltage and V
OUT
is
the output voltage.
Thus the output voltage is:
2
R
2
R
1
R
923
.
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:
)
923
.
V
(
83
.
10
1
R
OUT
×
=
(k
)
For example, for a 3.3V output voltage, R2 is
10k
, and R1 is 26.1k
.
Inductor
The inductor is required to supply constant
current to the output load while being driven by
the switched input voltage. A larger value
inductor will result in less ripple current that will
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 the inductance to use is to allow
the peak-to-peak ripple current in the inductor
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. The peak
inductor current can be 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 requirements.
Optional Schottky Diode
During the transition between 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 1 lists example
Schottky diodes and their Manufacturers.
Table 1—Diode Selection Guide
Part Number
B130
SK13
MBRS130
Voltage/Current
Rating
30V, 1A
30V, 1A
30V, 1A
Vendor
Diodes, Inc.
Diodes, Inc.
International
Rectifier
Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required
to supply the AC current to the step-down
converter 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
may also suffice.
Choose X5R or X7R
dielectrics when using ceramic capacitors.
Since the input capacitor (C1) absorbs the input
switching current it requires an adequate ripple
current rating. The RMS current in the input
capacitor can be estimated by:
×
1
×
=
IN
OUT
V
IN
OUT
V
LOAD
1
C
V
V
I
I
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MP2307 | 3A, 23V, 340KHz Synchronous Rectified Step-Down Converter |
| MP2307DN | 3A, 23V, 340KHz Synchronous Rectified Step-Down Converter |
| MP2307_06 | 3A, 23V, 340KHz Synchronous Rectified Step-Down Converter |
| MP2309 | 1A, 23V, 340KHz Synchronous Step-Down Converter Evaluation Board |
| MP4009 | Silicon PNP Triple Diffused Type (Four Darlington Power Transistors in One) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MP2305DS | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:2A, 23V Synchronous Rectified Step-Down Converter |
| MP2305DS-LF | 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: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。