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參數(shù)資料
| 型號(hào)： | MIC2017 |
| 廠(chǎng)商： | Micrel Semiconductor,Inc. |
| 元件分類(lèi)： | 熱切換/電源分布 |
| 英文描述： | Adjustable Current Limit Power Distribution Switch |
| 中文描述： | 可調(diào)的限流配電開(kāi)關(guān) |
| 文件頁(yè)數(shù)： | 5/17頁(yè) |
| 文件大?。?/td> | 748K |
| 代理商： | MIC2017 |
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Micrel
MIC2007/MIC2017
October 2005
13
M9999-102805
Application Information
Setting ILIMIT
The MIC2007/2017’s current limit is user programmable
and controlled by a resistor connected between the ILIMIT
pin and Ground. The value of this resistor is determined
by the following equation:
ILIMIT = Current Limit Factor (CLF)
RSET
or
RSET () = Current Limit Factor (V)
ILIMIT (A)
Example:
Set ILIMIT = 1.25A
Looking in the Electrical specifications we will find CLF
at ILIMIT = 1A. For the sake of this example, we will say
the typical value of CLF at an IOUT of 1A is 235V.
Applying the equation above:
RSET () = 235 V
1.25 A
RSET = 188
Designers should be aware that variations in the
measured ILIMIT for a given RSET resistor, will occur
because of small differences between individual ICs
(inherent in silicon processing) resulting in a spread of
ILIMIT values. In the example above we used the typical
value of CLF to calculate RSET. We can determine ILIMIT’s
spread by using the minimum and maximum values of
CLF and the calculated value of RSET.
RSET = 187
(the closest standard 1% value)
ILIMIT_MIN = 210V = 1.12A
187
ILIMIT_MIN = 260V = 1.39A
187
Giving us a maximum ILIMIT variation over temperature
of:
ILIMIT_MIN
ILIMIT_TYP
ILIMIT_MAX
1.12A
1.25A
1.39A
or
1.25A ±11%
ILIMIT vs. IOUT measured
The
MIC2007/2017’s
current limiting
circuitry is
designed to act as a constant current source to the load.
As the load tries to pull more than the allotted current,
VOUT drops and the input to output voltage differential
increases. When VIN -VOUT exceeds 1V, IOUT drops below
ILIMIT to reduce the drain of fault current on the system’s
power supply and to limit internal heating of the
MIC2007/2017.
When measuring IOUT it is important to bear this voltage
dependence in mind. Otherwise, the measurement data
may appear to indicate a problem when none really
exists. This voltage dependence is illustrated in Figures
4 and 5.
In Figure 4, output current is measured as VOUT is pulled
below VIN, with the test terminating when VOUT is 1V
below VIN. Observe that once ILIMIT is reached IOUT
remains constant throughout the remainder of the test.
In Figure 5, this test is repeated but with VIN - VOUT
exceeding 1V.
When VIN - VOUT > 1V, the MIC2007/2017’s current
limiting circuitry responds by decreasing IOUT, as can be
seen in Figure 5. In this demonstration, VOUT is being
controlled and IOUT is the measured quantity. In real life
applications, VOUT is determined in accordance with
Ohm’s law by the load and the limiting current.
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| MIC2017YML | 制造商:MICREL 制造商全稱(chēng):Micrel Semiconductor 功能描述:Adjustable Current Limit Power Distribution Switch |
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