參數(shù)資料
型號(hào)： MP1580HP
廠(chǎng)商： MONOLITHIC POWER SYSTEMS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 2A, 380 KHz Step-Down Converter
中文描述： 3.6 A SWITCHING REGULATOR, 418 kHz SWITCHING FREQ-MAX, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 5/10頁(yè)
文件大?。?/td> 259K
代理商： MP1580HP
MP1580 – 2A, 380KHz STEP-DOWN CONVERTER
MP1580 Rev. 3.0
12/5/2005
www.MonolithicPower.com
5
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2005 MPS. All Rights Reserved.
TM
APPLICATION INFORMATION
COMPONENT SELECTION
Sync Pin Operation
The SYNC pin driving waveform should be a
square wave with a rise time less than 20ns.
The Minimum High voltage level is 2.7V and the
Low level is less than 0.8V. The frequency of
the external sync signal needs to be greater
than 445KHz.
A rising edge on the SYNC pin forces a reset of
the oscillator. The upper transistor M1 is
switched off immediately if it is not already off.
250ns later M1 turns on connecting SW to V
IN
.
Setting the Output Voltage
The output voltage is set using a resistive
voltage divider from the output to FB (see
Figure 3). The voltage divider divides the output
voltage down 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
222
.
V
OUT
+
×
=
R2 can be as high as 100k
, but a typical value
is 10k
. Using this value, R1 is determined by:
)
222
.
V
(
18
.
1
R
OUT
×
For example, for a 3.3V output voltage, R2 is
10k
and R1 is 17k
.
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 results in less ripple current that in turn
results in lower output ripple voltage.
However, the larger value inductor has a larger
physical size, higher series resistance and/or
lower saturation current. Choose an inductor
that does not saturate under the worst-case
load conditions.
A good rule for determining the inductance is to
allow the peak-to-peak ripple current in the
inductor to be approximately 30% of the
maximum load current. Also, make sure that the
peak inductor current (the load current plus half
the peak-to-peak inductor ripple current) is
below the 2.4A minimum current limit.
The inductance value can be calculated by the
equation:
I
f
V
)
V
V
(
V
L
IN
OUT
×
IN
OUT
×
×
=
Where V
IN
is the input voltage, f is the oscillator
frequency and
I is the peak-to-peak inductor
ripple current. Table 1 lists a number of suitable
inductors from various manufacturers.
Table 1—Inductor Selection Guide
Package
Dimensions
(mm)
W
L
Vendor/
Model
Sumida
CR75
CDH74
CDRH5D28 Shielded
CDRH5D28 Shielded
CDRH6D28 Shielded
CDRH104R Shielded
Toko
D53LC
Type A
D75C
D104C
D10FL
Coilcraft
DO3308
DO3316
Core
Type
Core
Material
H
Open
Open
Ferrite
Ferrite
Ferrite
Ferrite
Ferrite
Ferrite
7.0
7.3
5.5
5.5
6.7
10.1
7.8
8.0
5.7
5.7
6.7
10.0
5.5
5.2
5.5
5.5
3.0
3.0
Shielded
Ferrite
5.0
5.0
3.0
Shielded
Shielded
Open
Ferrite
Ferrite
Ferrite
7.6
10.0
9.7
7.6
10.0
11.5
5.1
4.3
4.0
Open
Open
Ferrite
Ferrite
9.4
9.4
13.0
13.0
3.0
5.1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MP1580HP-LF 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 2A 380kHz Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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
MP1580HS 制造商:MPS 制造商全稱(chēng):Monolithic Power Systems 功能描述:2A, 380 KHz Step-Down Converter
MP1580HS-LF 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 2A 380kHz 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(kāi)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
MP1580HS-LF-Z 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 2A 380kHz RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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
MP1582EN-LF 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 2A 1.5MHz 28V Nonsync Buck 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(kāi)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
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