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參數(shù)資料
| 型號： | MIC2583-KBQS |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | Single Channel Hot Swap Controllers |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO16 |
| 封裝： | QSOP-16 |
| 文件頁數(shù)： | 18/22頁 |
| 文件大?。?/td> | 190K |
| 代理商： | MIC2583-KBQS |
MIC2582/MIC2583
Micrel
MIC2582/MIC2583
18
April 2003
MOSFET Selection
Selecting the proper external MOSFET for use with the
MIC2582/83 involves three straightforward tasks:
Choice of a MOSFET which meets minimum
voltage requirements.
Selection of a device to handle the maximum
continuous current (steady-state thermal
issues).
Verify the selected part
’
s ability to withstand any
peak currents (transient thermal issues).
MOSFET Voltage Requirements
The first voltage requirement for the MOSFET is easily
stated: the drain-source breakdown voltage of the MOSFET
must be greater than V
IN(MAX)
. For instance, a 12V input may
reasonably be expected to see high-frequency transients as
high as 18V. Therefore, the drain-source breakdown voltage
of the MOSFET must be at least 19V. For ample safety
margin and standard availability, the closest value will be
20V.
The second breakdown voltage criterion that must be met is
a bit subtler than simple drain-source breakdown voltage, but
C3
0.05
μ
F
SENSE
VCC
ON
CPOR
FB
GATE
GND
/POR
Undervoltage (Output) = 11.0V
/POR Delay = 25ms
START-UP Delay = 6ms
*Recommended for MOSFETs with gate-source
breakdown of 20V or less for catastrophic output
short circuit protection. (IRF7822 VGS(MAX) = 12V)
Q1
IRF7822
(SO-8)
R3
10
*D2
1N5240B
10V
R5
13.3k
1%
R1
33k
R2
33k
MIC2582
C1
1
μ
F
C2
0.01
μ
F
C
LOAD
220
μ
F
R6
47k
R4
100k
1%
V
OUT
12V@6A
V
IN
V
IN
12V
1
4
3
8
7
5
2
6
R
0.006
5%
1
2
3
4
DOWNSTREAM
SIGNAL
D1
(18V)
Figure 9. Zener Clamped MOSFET Gate
is not hard to meet. In MIC2582/83 applications, the gate of
the external MOSFET is driven up to approximately 19.5V by
the internal output MOSFET (again, assuming 12V opera-
tion). At the same time, if the output of the external MOSFET
(its source) is suddenly subjected to a short, the gate-source
voltage will go to (19.5V
–
0V) = 19.5V. This means that the
external MOSFET must be chosen to have a gate-source
breakdown voltage of 20V or more, which is an available
standard maximum value. However, if operation is at or
above 13V, the 20V gate-source maximum will likely be
exceeded. As a result, an external Zener diode clamp should
be used to prevent breakdown of the external MOSFET when
operating at voltages above 8V. A Zener diode with 10V
rating is recommended as shown in Figure 9. At the present
time, most power MOSFETs with a 20V gate-source voltage
rating have a 30V drain-source breakdown rating or higher.
As a general tip, choose surface-mount devices with a drain-
source rating of 30V as a starting point.
Finally, the external gate drive of the MIC2582/83 requires a
low-voltage logic level MOSFET when operating at voltages
lower than 3V. There are 2.5V logic level MOSFETs avail-
able. Please see Table 4 MOSFET and Sense Resistor
Vendorsfor suggested manufacturers.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2583-LBQS | Single Channel Hot Swap Controllers |
| MIC2583-MBQS | Single Channel Hot Swap Controllers |
| MIC2583R-JBQS | Single Channel Hot Swap Controllers |
| MIC2583R-KBQS | Single Channel Hot Swap Controllers |
| MIC2583R-LBQS | Single Channel Hot Swap Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2583-KBQS TR | 功能描述:IC CTRLR HOT SWAP 100MV 16-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| MIC2583-KYQS | 功能描述:熱插拔功率分布 Single-Channel Hot-Swap Controller - 100mV Fast-Trip Threshold - Lead Free RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MIC2583-KYQS TR | 功能描述:熱插拔功率分布 Single-Channel Hot-Swap Controller - 100mV Fast-Trip Threshold - Lead Free RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MIC2583-LBQS | 功能描述:IC CTRLR HOT SWAP 150MV 16-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| MIC2583-LBQS TR | 功能描述:IC CTRLR HOT SWAP 150MV 16-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
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