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參數(shù)資料
| 型號： | MP1580HP |
| 廠商： | MONOLITHIC POWER SYSTEMS INC |
| 元件分類： | 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 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 259K |
| 代理商： | MP1580HP |
MP1580 – 2A, 380KHz STEP-DOWN CONVERTER
MP1580 Rev. 3.0
12/5/2005
www.MonolithicPower.com
6
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2005 MPS. All Rights Reserved.
TM
Input Capacitor
The input current to the step-down converter is
discontinuous, so a capacitor is required to
supply the AC current to the step-down
converter while maintaining the DC input
voltage. A low ESR capacitor is required to
keep the noise at the IC to a minimum. Ceramic
capacitors are preferred, but tantalum or low-
ESR electrolytic capacitors will also suffice.
The input capacitor value should be greater
than 10μF. The capacitor can be electrolytic,
tantalum or ceramic. However, since it absorbs
the input switching current it requires an
adequate ripple current rating. Its RMS current
rating should be greater than approximately 1/2
of the DC load current.
To ensure stable operation, C1 should be
placed as close to the IN pin as possible.
Alternately, a smaller high quality ceramic
0.1μF capacitor may be placed closer to the IN
pin and a larger capacitor placed further away.
If using this technique, it is recommended that
the larger capacitor be a tantalum or electrolytic
type capacitor. All ceramic capacitors should be
placed close to the MP1580.
Output Capacitor
The output capacitor is required to maintain the
DC output voltage. Low ESR capacitors are
preferred to keep the output voltage ripple low.
The characteristics of the output capacitor also
affect the stability of the regulation control
system. Ceramic, tantalum or low ESR
electrolytic capacitors are recommended. In the
case of ceramic capacitors, the impedance at
the oscillator frequency is dominated by the
capacitance, so the output voltage ripple is
mostly independent of the ESR. The output
voltage ripple is estimated to be:
2
LC
f
IN
RIPPLE
V
f
V
4
×
×
Where V
RIPPLE
is the output ripple voltage, f
LC
is
the resonant frequency of the LC filter and f is
the oscillator frequency.
In the case of tantalum or low-ESR electrolytic
capacitors, the ESR dominates the impedance
at the oscillator frequency, therefore the output
ripple is calculated as:
ESR
RIPPLE
V
R
I
×
Where V
RIPPLE
is the output voltage ripple and
R
ESR
is the equivalent series resistance of the
output capacitors.
Output Rectifier Diode
The output rectifier diode supplies the current to
the inductor when the upper transistor M1 is off.
To reduce losses due to the diode forward
voltage and recovery times, use a Schottky
rectifier.
Table 2 provides the Schottky rectifier part
numbers based on the maximum input voltage
and current rating.
Table 2—Schottky Rectifier Selection Guide
2A Load Current
Part Number
30BQ015
B220
SK23
SR22
20BQ030
B230
SK23
SR23
SS23
V
IN
(Max)
Vendor
4
1
6
6
4
1
6
3, 6
2, 3
15V
20V
26V
Table 3 lists some rectifier manufacturers.
Table 3—Schottky Diode Manufacturers
Vendor
Diodes, Inc.
Fairchild Semiconductor www.fairchildsemi.com
General Semiconductor www.gensemi.com
International Rectifier
On Semiconductor
Pan Jit International
Web Site
www.diodes.com
www.irf.com
www.onsemi.com
www.panjit.com.tw
Choose a rectifier that has a maximum reverse
voltage rating greater than the maximum input
voltage, and a current rating greater than the
maximum load current.
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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:Monolithic Power Systems 功能描述:2A, 380 KHz Step-Down Converter |
| MP1580HS-LF | 功能描述:開關(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/直流開關(guān)轉(zhuǎn)換器 2A 380kHz 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 |
| MP1582EN-LF | 功能描述:開關(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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