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參數(shù)資料
| 型號： | MP1593_06 |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 3A, 28V, 385KHz Step-Down Converter |
| 中文描述： | 第3A，28V的，385KHz降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 326K |
| 代理商： | MP1593_06 |
MP1593 – 3A, 28V, 385KHz STEP-DOWN CONVERTER
MP1593 Rev. 1.9
9/14/2006
www.MonolithicPower.com
7
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
Output Rectifier Diode
The output rectifier diode supplies current to the
inductor when the high-side switch is off. Use a
Schottky diode to reduce losses due to diode
forward voltage and recovery times.
Choose a diode whose maximum reverse
voltage rating is greater than the maximum
input voltage, and whose current rating is
greater than the maximum load current. Table 2
lists
example
Schottky
manufacturers.
diodes
and
Table 2—Diode Selection Guide
Diode
SK33
SK34
B330
B340
MBRS330
MBRS340
Voltage/Current
Rating
30V, 3A
40V, 3A
30V, 3A
40V, 3A
30V, 3A
40V, 3A
Manufacture
Diodes Inc.
Diodes Inc.
Diodes Inc.
Diodes Inc.
On Semiconductor
On Semiconductor
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
will also suffice.
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
The worst-case condition occurs at V
IN
= 2V
OUT
,
where:
2
I
I
LOAD
1
C
=
For simplification, choose the input capacitor
whose RMS current rating is greater than half of
the maximum load current.
The input capacitor can be electrolytic, tantalum
or ceramic. When using electrolytic or tantalum
capacitors, a small, high quality ceramic
capacitor (i.e. 0.1
μ
F) should be placed as close
to the IC as possible. When using ceramic
capacitors, make sure that they have enough
capacitance to provide sufficient charge to
prevent excessive voltage ripple at the input.
The input voltage ripple caused by the
capacitance can be estimated by:
×
×
×
=
IN
OUT
V
IN
OUT
V
S
LOAD
I
IN
V
1
V
1
C
f
V
Output Capacitor
The output capacitor is required to maintain the
DC output voltage. Ceramic, tantalum or low
ESR electrolytic capacitors are recommended.
Low ESR capacitors are preferred to keep the
output voltage ripple low. The output voltage
ripple can be estimated by:
×
×
+
×
×
×
=
2
C
f
8
1
R
V
V
1
L
f
V
V
S
ESR
IN
OUT
S
OUT
OUT
Where L is the inductor value, C2 is the output
capacitance value and R
ESR
is the equivalent
series resistance (ESR) value of the output
capacitor.
In the case of ceramic capacitors, the
impedance at the switching frequency is
dominated by the capacitance, which is the
main cause of the output voltage ripple. For
simplification, the output voltage ripple can be
estimated by:
×
×
×
×
=
IN
OUT
V
2
S
OUT
V
OUT
V
1
2
C
L
f
8
V
In the case of tantalum or electrolytic
capacitors, the ESR dominates the impedance
at the switching frequency. For simplification,
the output ripple can be approximated to:
ESR
IN
OUT
V
S
OUT
V
×
OUT
R
V
1
L
f
V
×
×
=
The characteristics of the output capacitor also
affect the stability of the regulation system. The
MP1593 can be optimized for a wide range of
capacitance and ESR values.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MP1593DN | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:3A, 28V, 385KHz Step-Down Converter |
| 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 |
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