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| 型号： | MIC2587-1BM |
| 厂商： | Micrel Inc |
| 文件页数： | 18/22页 |
| 文件大小： | 972K |
| 描述： | IC CTRLR HOTSWAP 1CHAN POS 8SOIC |
| 标准包装： | 95 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 10 V ~ 80 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
icrel, Inc.
MIC2587/MIC2587R
anuary 24, 2013
18
Revision 2.0
Sense Resistor Selection
The sense resistor is nominally valued at:
OM)
HOT_SWAP(N
TRIP(TYP)
SENSE(NOM)
I
V
=
Eq. 11
where:
V
TRIP(TYP)
is the typical (or nominal) circuit breaker
threshold voltage (47mV) and I
HOT_SWAP(NOM)
is the
nominal inrush load current level to trip the internal circuit
breaker.
To accommodate worst-case tolerances in the sense
resistor (for a ?% initial tolerance, allow ?% tolerance
for variations over time and temperature) and circuit
breaker threshold voltages, a slightly more detailed
calculation must be used to determine the minimum and
maximum hot swap load currents.
As the MIC2587/MIC2587R's minimum current-limit
threshold voltage is 39mV, the minimum hot swap load
current is determined where the sense resistor is 3%
high:
(
)
SENSE(NOM)
SENSE(NOM)
IN)
HOT_SWAP(M
R
37.9mV
R
1.03
39mV
=
?/DIV>
=
Keep in mind that the minimum hot swap load current
should be greater than the application circuit's upper
steady-state load current boundary. Once the lower value
of R
SENSE
has been calculated, it is good practice to check
the maximum hot swap load current (I
HOT_SWAP(MAX)
) which
the circuit may let pass in the case of tolerance build-up
in the opposite direction. Here, the worst-case maximum
is found using a V
TRIP(MAX)
threshold of 55mV and a sense
resistor 3% low in value:
(
)
SENSE NOM
SENSE NOM
AX)
HOT_SWAP(M
R
56.7mV
R
0.97
55mV
=
?/DIV>
=
In this case, the application circuit must be sturdy enough
to operate over a ~1.5-to-1 range in hot swap load
currents. For example, if an MIC2587 circuit must pass a
minimum hot swap load current of 4A without nuisance
trips, R
SENSE
should be set to:
&
=
=
9.75m
4A
39mV
SENSE(NOM)
where the nearest 1% standard value is 9.76m&. At the
other tolerance extremes, I
HOT_SWAP(MAX)
for the circuit in
question is then simply:
5.8A
.7 m
56.7mV
AX)
HOT_SWAP(M
=
&
=
With a knowledge of the application circuit's maximum
hot swap load current, the power dissipation rating of the
sense resistor can be determined using P = I
2
?R. Here,
The current is I
HOT_SWAP(MAX)
= 5.8A and the resistance
R
SENSE(MIN)
= (0.97)(R
SENSE(NOM)
) = 9.47m&. Thus, the
sense resistor's maximum power dissipation is:
P
MAX
= (5.8A)
2
?(9.47m&) = 0.319W
A 0.5W sense resistor is a good choice in this application.
When the MIC2587/MIC2587Rs foldback current limiting
circuit is engaged in the above example, the current limit
would nominally fold back to 1.23A when the output is
shorted to ground.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2587-1BM TR | 功能描述:IC CTRLR HOT SWAP POS HV 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| MIC2587-1YM | 功能描述:热插拔功率分布 Positive High Voltage Hot-Swap Controller - Lead Free RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MIC2587-1YM TR | 功能描述:热插拔功率分布 Positive High Voltage Hot-Swap Controller - Lead Free RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MIC2587-1YMTR | 制造商:Micrel Inc 功能描述: |
| MIC2587-2BM | 功能描述:IC CTRLR HOT SWAP POS HV 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
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