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| 型號： | MIC2583R-MBQS TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 18/25頁 |
| 文件大?。?/td> | 826K |
| 描述： | IC CTRLR HOT SWAP 200MV 16-QSOP |
| 標準包裝： | 2,500 |
| 類型： | 熱交換控制器 |
| 應用： | 通用 |
| 內部開關： | 無 |
| 電源電壓： | 2.3 V ~ 13.2 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-QSOP |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | MIC2583R-MBQSTR MIC2583R-MBQSTR-ND |
Micrel, Inc.
MIC2582/MIC2583
April 2009
18
M9999-043009-C
For additional information on MOSFET thermal
considerations, please see MOSFET Selection text and
subsequent sections.
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礎 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 tolerances for both the sense
resistor (allow ?% over time and temperature for a
resistor with ?% 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:
( )(
)
)
(
)
(
)
(
8
.
40
03
.
1
42
CONT
LOAD
CONT
LOAD
MAX
SENSE
I
mV
I
mV
R
=
=
(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 current is found using a 59mV trip
voltage and a sense resistor that is 3% low in value. The
resulting equation is:
(
)
)
(
)
(
)
,
(
8
.
60
)
97
.
0
(
59
NOM
SENSE
NOM
SENSE
MAX
CONT
LOAD
R
mV
R
mV
I
=
=
(1 2 )
As an example, if an output must carry a continuous 2A
without nuisance trips occurring, Equation 11
yields:
.
4
.
20
2
8
.
40
)
(
?/DIV>
=
=
m
A
mV
R
MAX
SENSE
The next
lowest standard value is 20m&. At the other set of
tolerance extremes for the output in question,
,
04
.
3
0
.
20
8
.
60
)
,
(
A
m
mV
I
MAX
CONT
LOAD
=
?/DIV>
=
approximately 3A.
Knowing this final data, 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 ?/SPAN>W sense resistor is sufficient.
Figure 8. 5V Switch/3.3V LDO Application
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| MIC2583R-MYQS | 功能描述:熱插拔功率分布 Single-Channel Hot-Swap Controller - 200mV Fast-Trip Threshold - Lead Free RoHS:否 制造商:Texas Instruments 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MIC2583R-MYQS TR | 功能描述:熱插拔功率分布 Single-Channel Hot-Swap Controller - 200mV Fast-Trip Threshold - Lead Free RoHS:否 制造商:Texas Instruments 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MIC2584-JBTS | 功能描述:IC CTRLR HOT SWAP DUAL 16-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:100 系列:- 類型:熱插拔開關 應用:通用 內部開關:是 電流限制:可調 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 供應商設備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| MIC2584-JBTS TR | 功能描述:IC CTRLR HOT SWAP DUAL 16-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:100 系列:- 類型:熱插拔開關 應用:通用 內部開關:是 電流限制:可調 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 供應商設備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| MIC2584-JYTS | 功能描述:熱插拔功率分布 Dual Channel Hot-Swap Controller - 100mV Threshold - Lead Free RoHS:否 制造商:Texas Instruments 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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