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參數(shù)資料
| 型號(hào)： | NCV8843MNR2G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A, 340 kHz, Buck Regulator with Synchronization Capability |
| 中文描述： | 3 A SWITCHING REGULATOR, 374 kHz SWITCHING FREQ-MAX, PDSO18 |
| 封裝： | 6 X 5 MM, 0.50 MM PITCH, LEAD FREE, DFN-18 |
| 文件頁(yè)數(shù)： | 12/15頁(yè) |
| 文件大?。?/td> | 193K |
| 代理商： | NCV8843MNR2G |
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NCV8843
http://onsemi.com
12
The worse case of the diode average current occurs during
maximum load current and maximum input voltage. For the
diode to survive the short circuit condition, the current rating
of the diode should be equal to the Foldback Current Limit.
See Table 1 for Schottky diodes from ON Semiconductor
which are suggested for use with the NCV8843 regulator.
Inductor Selection
When choosing inductors, one might have to consider
maximum load current, core and copper losses, component
height, output ripple, EMI, saturation and cost. Lower
inductor values are chosen to reduce the physical size of the
inductor. Higher value cuts down the ripple current, core
losses and allows more output current. For most
applications, the inductor value falls in the range between
2.2 H and 22 H. The saturation current ratings of the
inductor shall not exceed the I
L(PK)
, calculated according to
VO(VIN
2(fS)(L)(VIN)
IL(PK)
IO
VO)
The DC current through the inductor is equal to the load
current. The worse case occurs during maximum load
current. Check the vendor’s spec to adjust the inductor value
under current loading. Inductors can lose over 50% of
inductance when it nears saturation.
The core materials have a significant effect on inductor
performance. The ferrite core has benefits of small physical
size, and very low power dissipation. But be careful not to
operate these inductors too far beyond their maximum
ratings for peak current, as this will saturate the core.
Powered Iron cores are low cost and have a more gradual
saturation curve. The cores with an open magnetic path, such
as rod or barrel, tend to generate high magnetic field
radiation. However, they are usually cheap and small. The
cores providing a close magnetic loop, such as potcore and
toroid, generate low electromagnetic interference (EMI).
There are many magnetic component vendors providing
standard product lines suitable for the NCV8843. Table 2
lists three vendors, their products and contact information.
Table 1.
Part Number
V
BREAKDOWN
(V)
I
AVERAGE
(A)
V
(F)
(V) @ I
AVERAGE
Package
1N5817
20
1.0
0.45
Axial Lead
1N5818
30
1.0
0.55
Axial Lead
1N5819
40
1.0
0.6
Axial Lead
MBR0520
20
0.5
0.385
SOD123
MBR0530
30
0.5
0.43
SOD123
MBR0540
40
0.5
0.53
SOD123
MBRS120
20
1.0
0.55
SMB
MBRS130
30
1.0
0.395
SMB
MBRS140
40
1.0
0.6
SMB
Table 2.
Vendor
Product Family
Web Site
Telephone
Coiltronics
UNIPac1/2: SMT, barrel
THINPAC: SMT, toroid, low profile
CTX: Leaded, toroid
www.coiltronics.com
(516) 2417876
Coilcraft
DO1608: SMT, barrel
DS/DT 1608: SMT, barrel, magnetically shielded
DO3316: SMT, barrel
DS/DT 3316: SMT, barrel, magnetically shielded
DO3308: SMT, barrel, low profile
www.coilcraft.com
(800) 3222645
Pulse
www.pulseeng.com
(619) 6748100
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| NCV8843 | 1.5 A, 340 kHz, Buck Regulator with Synchronization Capability(具有同步能力的1.5A, 340kHz, 降壓穩(wěn)壓器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV8843MNR2GEVB | 功能描述:電源管理IC開(kāi)發(fā)工具 NCV8843 EVAL BRD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| NCV8843PWG | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 1.5A LO VLT BUCK REG 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 |
| NCV8843PWR2G | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 16L SOW EPAD 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 |
| NCV8851 | 制造商:ONSEMI 制造商全稱(chēng):ON Semiconductor 功能描述:Automotive Grade Synchronous Buck Controller |
| NCV8851-1DBR2G | 制造商:ON Semiconductor 功能描述:SYNC BUCK CONTROLLER - Tape and Reel 制造商:ON Semiconductor 功能描述:SYNC BUCK CONTROLLER - Cut TR (SOS) 制造商:ON Semiconductor 功能描述:IC REG DL BCK/LINEAR 制造商:ON Semiconductor 功能描述:REEL / SYNC BUCK CONTROLLER |
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