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MIC5011 Datasheet

  • MIC5011

  • Micrel Semiconductor [Minimum Parts High- or Low-Side MOSFE...

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  • MICREL   MICREL

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MIC5011
Micrel
Applications Information
(Continued)
7 to 15V
1N5817
1N4001 (2)
100nF
+
10碌F
15V
33k鈩?/div>
33pF
100k鈩?/div>
4N35
100k鈩?/div>
1k鈩?/div>
To MIC5011
Input
MPSA05
IRF540
MIC5011
Control Input
1 V+
2 Input
C1 8
Com 7
3 Source
C2 6
4 Gnd
Gate 5
10mA
Control Input
LOAD
Figure 4. Bootstrapped
High-Side Driver
Opto-Isolated Interface
(Figure 5). Although the MIC5011
has no special input slew rate requirement, the lethargic
transitions provided by an opto-isolator may cause oscilla-
tions on the rise and fall of the output. The circuit shown
accelerates the input transitions from a 4N35 opto-isolator
by adding hysteresis. Opto-isolators are used where the
control circuitry cannot share a common ground with the
MIC5011 and high-current power supply, or where the
control circuitry is located remotely. This implementation is
intrinsically safe; if the control line is severed the MIC5011
will turn OFF.
Industrial Switch
(Figure 6). The most common manual
control for industrial loads is a push button on/off switch.
The 鈥渙n鈥?button is physically arranged in a recess so that in
a panic situation the 鈥渙ff鈥?button, which extends out from the
control box, is more easily pressed. This circuit is compat-
Figure 5. Improved
Opto-Isolator Performance
ible with control boxes such as the CR2943 series (GE).
The circuit is configured so that if both switches close
simultaneously, the 鈥渙ff鈥?button has precedence.
This application also illustrates how two (or more) MOSFETs
can be paralleled. This reduces the switch drop, and distrib-
utes the switch dissipation into multiple packages.
High-Voltage Bootstrap
(Figure 7). Although the MIC5011
is limited to operation on 4.75 to 32V supplies, a floating
bootstrap arrangement can be used to build a high-side
switch that operates on much higher voltages. The MIC5011
and MOSFET are configured as a low-side driver, but the
load is connected in series with ground.
Power for the MIC5011 is supplied by a charge pump. A
20kHz square wave (15Vp-p) drives the pump capacitor
and delivers current to a 100碌F storage capacitor. A zener
24V
100k鈩?/div>
ON
CR2943-NA102A
(GE)
OFF
+
MIC5011
1 V+
2 Input
C1 8
Com 7
10碌F
3 Source
C2 6
4 Gnd
Gate 5
IRFP044 (2)
330k鈩?/div>
LOAD
Figure 6. 50-Ampere
Industrial Switch
MIC5011
8
July 2000

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