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參數(shù)資料
| 型號(hào)： | MIC2582 |
| 廠商： | Micrel Semiconductor,Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Single Channel Hot Swap Controllers |
| 中文描述： | 單通道熱插拔控制器 |
| 文件頁(yè)數(shù)： | 17/22頁(yè) |
| 文件大?。?/td> | 190K |
| 代理商： | MIC2582 |
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April 2003
17
MIC2582/MIC2583
MIC2582/MIC2583
Micrel
GND
SENSE
VCC
ON
/POR
FB
GATE
GND
Long
Pin
Backplane
Connector
PCB Edge
Connector
Long
Pin
Undervoltage (Output) = 3.3V
All resistors 5% unless specified otherwise
Short
Pin
Q1
Si4876DY
(SO-8)
Q2
Si4876DY
(SO-8)
R2
10
R7
11.8k
1%
R1
47k
Open
Circuit
MIC2582
C1
0.47 F
C2
0.022 F
V
IN
C5
330 F
C6
100 F
C3
4700pF
R3
10
R6
20k
1%
V
OUT
5V@3.5A
V
3.3V@0.5A
V
IN
5V
4
8
7
5
1
2
CPOR
3
6
R5
510k
Q3
PN2222
R8
20k
C4
0.1 F
R4
1.2M
D1
(9V)
R
0.010
2%
1
2
3
4
R9
750
Figure 8. 5V Switch/3.3V LDO Application
Auto-Restart - MIC2583R
The MIC2583R provides an auto-restart function. Upon an
overcurrent fault condition such as a short circuit, the
MIC2583R initially shuts off the GATE output. The MIC2583R
attempts to restart with a 12
μ
A charge current at a preset 10%
duty cycle until the fault condition is removed. The interval
between auto-retry attempts is set by capacitor C
FILTER
.
Sense Resistor Selection
The MIC2582 and MIC2583 use a low-value sense resistor to
measure the current flowing through the MOSFET switch
(and therefore the load). This sense resistor is nominally set
at 50mV/I
LOAD(CONT)
. To accommodate worst-case toler-
ances for both the sense resistor (allow
±
3% over time and
temperature for a resistor with
±
1% initial tolerance) and still
supply the maximum required steady-state load current, a
slightly more detailed calculation must be used.
The current limit threshold voltage (i.e., the
“
trip point
”
) for the
MIC2582/83 may be as low as 42mV, which would equate to
a sense resistor value of 42mV/I
LOAD(CONT)
. Carrying the
numbers through for the case where the value of the sense
resistor is 3% high yields:
R
42mV
1.03 I
(
40.8mV
I
SENSE(MAX)
LOAD(CONT)
LOAD(CONT)
=
(
)
=
(11)
Once the value of R
SENSE
has been chosen in this manner,
it is good practice to check the maximum I
LOAD(CONT)
which
the circuit may let through in the case of tolerance buildup in
the opposite direction. Here, the worst-case maximum cur-
rent is found using a 59mV trip voltage and a sense resistor
that is 3% low in value. The resulting equation is:
I
59mV
0.97 R
60.8mV
R
LOAD(CONT,MAX)
SENSE(NOM)
SENSE(NOM)
=
(
)
=
(12)
As an example, if an output must carry a continuous 2A
without nuisance trips occurring, Equation 11
40.8mV
2A
standard value is 20m
. At the other set of tolerance ex-
tremes for the output in question,
yields:
R
2
m
SENSE(MAX)
=
=
0 4
. The next lowest
I
60.8mV
20.0m
3
A
LOAD(CONT,MAX)
=
.04
, approximately 3A.
Knowing this final datum, we can determine the necessary
wattage of the sense resistor using P = I
2
R, where I will be
I
LOAD(CONT, MAX)
, and R will be (0.97)(R
SENSE(NOM)
). These
numbers yield the following: P
MAX
= (3A)
2
(19.4m
) = 0.175W.
In this example, a
1
/
4
W sense resistor is sufficient.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2582-JBM | Single Channel Hot Swap Controllers |
| MIC2583 | Single Channel Hot Swap Controllers |
| MIC2583-JBQS | Single Channel Hot Swap Controllers |
| MIC2583-KBQS | Single Channel Hot Swap Controllers |
| MIC2583-LBQS | Single Channel Hot Swap Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2582JBM | 制造商:Micrel Inc 功能描述: |
| MIC2582-JBM | 功能描述:IC CTRLR HOTSWAP 1CHAN POS 8SOIC 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(kāi)關(guān) 應(yīng)用:通用 內(nèi)部開(kāi)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(pán) 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| MIC2582-JBM TR | 功能描述:IC CTRLR HOTSWAP 1CHAN POS 8SOIC 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(kāi)關(guān) 應(yīng)用:通用 內(nèi)部開(kāi)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(pán) 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| MIC2582-JYM | 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 |
| MIC2582-JYM 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 |
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