MIC2015-0.5YML(2011-02) 查看數據表（PDF） - Micrel
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MIC2015-0.5YML Datasheet PDF : 29 Pages
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Micrel, Inc.
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 Ohm’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.
MIC20xx Family
Normalized Output Current
vs. Output Voltage (5V)
1.2
1.0
0.8
0.6
0.4
0.2
0
0123456
OUTPUT VOLTAGE (V)
Figure 6. Normalized Output Current vs. Output Voltage
Normalized Output Current
vs. Output Voltage (2.5V)
1.2
1.0
0.8
0.6
0.4
0.2
0
0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT VOLTAGE (V)
Figure 7. Normalized Output Current vs. Output Voltage
CSLEW
2003 2004 2005X 2006 2007 2008 2009X
2013 2014 2015 2016 2017
Only parts in bold have CSLEW pin.
(Not available in 5-pin SOT-23 packages).
2018 2019X
The CSLEW pin is provided to increase control of the
output voltage ramp at turn-on. This input allows
designers the option of decreasing the output’s slew rate
(slowing the voltage rise) by adding an external
capacitance between the CSLEW and VIN pins. This
capacitance slows the rate at which the pass FET gate
voltage increases and thus, slows both the response to
an Enable command as well as VOUT’s ascent to its final
value.
Figure 8 illustrates effect of CSLEW on turn-on delay and
output rise time.
February 2011
24
M9999-020311-D
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