MIC5014 Ver la hoja de datos (PDF) - Micrel
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componentes Descripción
Fabricante
MIC5014 Datasheet PDF : 12 Pages
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MIC5014/5015
10µF
MIC5014
1 V+
NC 8
2 Input
NC 7
3 Source NC 6
4 Gnd
Gate 5
1kΩ
12V
On
RS
0.06Ω
R4
1kΩ
R1
1kΩ
1000pF
12V
LM3905N
1 Trigger Logic 8
2
VREF
Emit 7
3 R/C
Coll 6
4 Gnd
V+ 5
0.01µF
R2 LM301A
120kΩ
2.2kΩ
Micrel, Inc.
Figure 5. High Side Driver with Delayed Overcurrent Shutdown
Typical Applications
Variable Supply Low Side Driver for Motor Speed Control
(Figure 6) The internal regulation in the MIC5014/15 allows
a steady gate enhancement to be supplied while the
MIC5014/15 supply varies from 5V to 30V, without damaging
the internal gate to source zener clamp. This allows the speed
of the DC motor shown to be varied by varying the supply
voltage.
VCC = +5V to +30V
MIC5014
1 V+
NC 8
ON
2 Input
NC 7
M
OFF
3 Source NC 6
4 Gnd
Gate 5
IRF540
applications, it is acceptable to allow this voltage to momen-
tarily turn the MOSFET back on as a way of dissipating the
inductor’s current. However, if this occurs when driving a
solenoid valve with a fast switching speed, chemicals or
gases may be inadvertantly be dispensed at the wrong time
with possibly disasterous consequences. Also, too large of
a kickback voltage (as is found in larger solenoids) can
damage the MIC5014 or the power FET by forcing the Source
node below ground (the MIC5014 can be driven up to 20V
below ground before this happens). A catch diode has been
included in this design to provide an alternate route for the
inductive kickback current to flow. The 5kΩ resistor in series
with this diode has been included to set the recovery time of
the solenoid valve.
24V
Figure 6: DC Motor Speed Control/Driver
MIC5015
1 V+
NC 8
OFF
2 Input
NC 7
ON
3 Source NC 6
4 Gnd
Gate 5
IRFZ40
Solenoid Valve Driver (Figure 7) High power solenoid valves
are used in many industrial applications requiring the timed
dispensing of chemicals or gases. When the solenoid is
activated, the valve opens (or closes), releasing (or stopping)
fluid flow. A solenoid valve, like all inductive loads, has a
considerable “kickback” voltage when turned off, as current
cannot change instantaneously through an inductor. In most
ASCO
8320A
Solenoid
1N4005
5kΩ
Figure 7: Solenoid Valve Driver
June 2005
7
MIC5014/5015
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