參數(shù)資料
型號(hào)： MP1593DN
廠商： MONOLITHIC POWER SYSTEMS INC
元件分類： 穩(wěn)壓器
英文描述： 3A, 28V, 385KHz Step-Down Converter
中文描述： 7.6 A SWITCHING REGULATOR, 435 kHz SWITCHING FREQ-MAX, PDSO8
封裝： MS-012BA, SOIC-8
文件頁(yè)數(shù)： 6/11頁(yè)
文件大?。?/td> 326K
代理商： MP1593DN
MP1593 – 3A, 28V, 385KHz STEP-DOWN CONVERTER
MP1593 Rev. 1.9
9/14/2006
www.MonolithicPower.com
6
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
APPLICATION INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The output voltage is set using a resistive
voltage divider from the output voltage to the
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
22
.
V
OUT
+
×
=
R2 can be as high as 100k
, but a typical value
is 10k
. Using that value, R1 is determined by:
)
k
)(
22
.
V
(
18
.
1
R
OUT
×
=
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 will result in less ripple current that will
result in lower output ripple voltage. However,
larger value inductors will have larger physical
size, higher series resistance and/or lower
saturation current. A good standard for
determining the inductance to use is to allow
the inductor 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
I
V
1
f
V
L
Where 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.
Table 1 lists a number of suitable inductors
from various manufacturers. The choice of
which inductor to use mainly depends on the
price vs. size requirements and any EMI
requirement.
Table 1—Inductor Selection Guide
Package
Dimensions
(mm)
W
L
Vendor/
Model
Core
Type
Core
Material
H
Sumida
CR75
CDH74
CDRH5D28 Shielded
CDRH5D28 Shielded
CDRH6D28 Shielded
CDRH104R Shielded
Toko
D53LC
Type A
D75C
D104C
D10FL
Coilcraft
DO3308
DO3316
Open
Open
Ferrite
Ferrite
Ferrite
Ferrite
Ferrite
Ferrite
7.0
7.3
5.5
5.5
6.7
10.1 10.0
7.8
8.0
5.7
5.7
6.7
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 10.0
9.7
7.6
5.1
4.3
4.0
1.5
Open
Open
Ferrite
Ferrite
9.4 13.0
9.4 13.0
3.0
5.1
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相關(guān)代理商/技術(shù)參數(shù)
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MP1593DN-LF 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3A 28V 385kHz 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
MP1593DN-LF-Z 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3A 28V 385kHz 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
MP15A0.5 功能描述:變阻器 50watt .5ohm RoHS:否 制造商:Ohmite 類型:Wirewound 功率額定值:25 W 電阻:25 Ohms 電壓額定值:500 V 容差:10 % 端接類型:Solder Lug 轉(zhuǎn)數(shù):300 錐度:Linear
MP15A1 功能描述:變阻器 50watt 1ohm RoHS:否 制造商:Ohmite 類型:Wirewound 功率額定值:25 W 電阻:25 Ohms 電壓額定值:500 V 容差:10 % 端接類型:Solder Lug 轉(zhuǎn)數(shù):300 錐度:Linear
MP15A1000 功能描述:變阻器 50watt 1K RoHS:否 制造商:Ohmite 類型:Wirewound 功率額定值:25 W 電阻:25 Ohms 電壓額定值:500 V 容差:10 % 端接類型:Solder Lug 轉(zhuǎn)數(shù):300 錐度:Linear
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