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MIC2007YML Datasheet(PDF) 23 Page - Micrel Semiconductor

Part # MIC2007YML
Description  Fixed and Adjustable Current Limiting Power Distribution Switches
PDF  30 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2007YML Datasheet(HTML) 23 Page - Micrel Semiconductor

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Micrel, Inc.
MIC20xx Family
August 2011
23
M9999-080211-D
Application Information
Setting ILIMIT
The MIC2009/2019’s current limit is user programmable
and controlled by a resistor connected between the
ILIMIT pin and GND. The value of this resistor is
determined by the following equation:
SET
LIMIT
R
LF)
itFactor(C
CurrentLim
I
=
or
(A)
I
LF)
itFactor(C
CurrentLim
R
LIMIT
SET =
For example: Set ILIMIT = 1.25A
Looking in the Electrical specifications we will find CLF
at ILIMIT = 1A.
Min
Typ
Max
Units
190
243
293
V
Table 1. CLF at ILIMIT = 1A
For the sake of this example, we will say the typical
value of CLF at an IOUT of 1A is 243V. Applying the
equation above:
Ω
=
=
Ω
4
.
194
1.25A
243V
)
(
RSET
RSET = 196Ω
(the closest standard 1% value)
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.
A
97
.
0
196
190V
ILIMIT_MIN
=
Ω
=
1.5A
196Ω
293V
ILIMIT_MAX
=
=
Giving us a maximum ILIMIT variation over temperature
of:
ILIMIT_MIN
ILIMIT_TYP
ILIMIT_MAX
0.97A (-22%)
1.25A
1.5A (+20%)
IOUT
RSET
ILIMIT_MIN
ILIMIT_MAX
0.1A
1928Ω
0.063A
0.136A
0.2A
993Ω
0.137A
0.265A
0.3A
673Ω
0.216A
0.391A
0.4A
511Ω
0.296A
0.515A
0.5A
413Ω
0.379A
0.637A
0.6A
346Ω
0.463A
0.759A
0.7A
299Ω
0.548A
0.880A
0.8A
263Ω
0.634A
1.001A
0.9A
235Ω
0.722A
1.121A
Table 2. MIC20x9A RSET Table
IOUT
RSET
ILIMIT_MIN
ILIMIT_MAX
0.2A
1125Ω
0.127A
0.267A
0.3A
765Ω
0.202A
0.390A
0.4A
582Ω
0.281A
0.510A
0.5A
470Ω
0.361A
0.629A
0.6A
395Ω
0.443A
0.746A
0.7A
341Ω
0.526A
0.861A
0.8A
300Ω
0.610A
0.976A
0.9A
268Ω
0.695A
1.089A
1A
243Ω
0.781A
1.202A
1.1A
222Ω
0.868A
1.314A
1.2A
204Ω
0.956A
1.426A
1.3A
189Ω
1.044A
1.537A
1.4A
176Ω
1.133A
1.647A
1.5A
165Ω
1.222A
1.757A
Table 3. MIC20x9 RSET Table



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