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参数资料
| 型号： | MIC2085-LBQS TR |
| 厂商： | Micrel Inc |
| 文件页数： | 22/29页 |
| 文件大小： | 1008K |
| 描述： | IC CTRLR HOW SWAP SGL 16-QSOP |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | 通用型 Infiniband? |
| 内部开关： | 无 |
| 电源电压： | 2.3 V ~ 16.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC2085-LBQSTR MIC2085-LBQSTR-ND |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页当前第22页第23页第24页第25页第26页第27页第28页第29页
Micrel, Inc.
MIC2085/2086
May 2006
22
M9999-050406
(408) 955-1690
Figure 10. A 50W InfiniBand" Application
Sense Resistor Selection
The MIC2085 and MIC2086 use a low-value sense
resistor to measure the current flowing through the
MOSFET switch (and therefore the load). This sense
resistor is nominally valued at 48mV/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 (the trip point ) for theMIC2085/86
may be as low as 40mV, which would equate to a sense
resistor value of 40mV/I
LOAD(CONT)
. Carrying the numbers
through for the case where the value of the sense
resistor is 3% high yields:
( )(
)
LOAD(CONT)
LOAD(CONT)
SENSE(MAX)
I
38.8mV
I
1.03
40mV
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 build-up in the opposite direction. Here, the
worst-case maximum cur-rent is found using a 55mV trip
voltage and a sense resistor that is 3% low in value. The
resulting equation is:
( )(
)
SENSE(NOM)
SENSE(NOM)
MAX)
LOAD(CONT,
R
56.7mV
R
0.97
55mV
I
=
=
(12)
As an example, if an output must carry a continuous
6Awithout nuisance trips occurring, Equation 11 yields:
6.5m&
6A
38.8mV
R
SENSE(MAX)
=
=
The next lowest standard value is 6.0mW. At the other
set of tolerance extremes for the output in question:
9.45A,
6.0m&
56.7mV
I
MAX)
LOAD(CONT,
=
=
almost 10A. 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:
PMAX = (10A)
2
(5.82m&) =0.582W.
In this example, a 1W sense resistor is sufficient.
MOSFET Selection
Selecting the proper external MOSFET for use with
theMIC2085/86 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 parts ability to withstand any
peak currents (transient thermal issues).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2085-MBQS | 功能描述:IC CTRLR HOW SWAP SGL 16-QSOP 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 |
| MIC2085-MBQS TR | 功能描述:IC CTRLR HOW SWAP SGL 16-QSOP 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 |
| MIC2085-XBQS | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Single Channel Hot Swap Controllers |
| MIC2086 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Single Channel Hot Swap Controllers |
| MIC2086-JBQS | 功能描述:IC CTRLR HOW SWAP SGL 20-QSOP 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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