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參數資料
| 型號： | NCV8842 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 1.5 A, 170 kHz, Buck Regulator with Synchronization Capability |
| 中文描述： | 1.5甲，170千赫，降壓穩(wěn)壓器的同步功能 |
| 文件頁數： | 12/15頁 |
| 文件大?。?/td> | 186K |
| 代理商： | NCV8842 |
NCV8842
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 NCV8842 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 NCV8842. 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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PDF描述 |
|---|---|
| NCV8842MNR2G | 1.5 A, 170 kHz, Buck Regulator with Synchronization Capability |
| NCV8842PWG | 1.5 A, 170 kHz, Buck Regulator with Synchronization Capability |
| NCV8842PWR2G | 1.5 A, 170 kHz, Buck Regulator with Synchronization Capability |
| NCV8843MNR2G | 1.5 A, 340 kHz, Buck Regulator with Synchronization Capability |
| NCV8843PWG | 1.5 A, 340 kHz, Buck Regulator with Synchronization Capability |
相關代理商/技術參數 |
參數描述 |
|---|---|
| NCV8842_11 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1.5 A, 170 kHz, Buck Regulator with Synchronization Capability |
| NCV8842DG | 功能描述:直流/直流開關轉換器 1.5A LOW VOLTAGE REG RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| NCV8842DR2G | 功能描述:直流/直流開關轉換器 1.5A LOW VOLTAGE REG RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| NCV8842MNR2G | 功能描述:直流/直流開關轉換器 1.5A LOW VOLTAGE BUCK REG RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| NCV8842MNR2GEVB | 功能描述:BOARD EVAL FOR NCV8842 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
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