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MIC2013-0.5YML Datasheet(PDF) 24 Page - Micrel Semiconductor

Part # MIC2013-0.5YML
Description  Fixed and Adjustable Current Limiting Power Distribution Switches
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2013-0.5YML Datasheet(HTML) 24 Page - Micrel Semiconductor

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Micrel, Inc.
MIC20xx Family
August 2011
24
M9999-080211-D
ILIMIT vs. IOUT Measured
The MIC20XX’s current-limiting circuitry, during current
limiting, 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 switch.
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, switch’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 Ω’s law by the
load and the limiting current.
Figure 4. IOUT in Current Limiting for VIN - VOUT < 1V
Figure 5. IOUT in Current Limiting for VIN - VOUT > 1V
This folding back of ILIMIT can be generalized by plotting
ILIMIT as a function of VOUT, as shown below in Figures 6
and 7. The slope of VOUT between IOUT = 0V and IOUT =
ILIMIT (where ILIMIT = 1A) is determined by RON of the
switch and ILIMIT.
0
0.2
0.4
0.6
0.8
1.0
1.2
01
2345
6
OUTPUT VOLTAGE (V)
Normalized Output Current
vs. Output Voltage (5V)
Figure 6. Normalized Output Current vs. Output Voltage


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