MIC5010
Micrel
extends out from the control box, is more easily pressed.
This circuit is compatible 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 prece-
dence. If there is a fault condition the circuit will latch off, and
it can be reset by pushing the 鈥渙n鈥?button.
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 10). Although the MIC5010
is limited to operation on 7 to 32V supplies, a floating
bootstrap arrangement can be used to build a high-side
switch that operates on much higher voltages. The MIC5010
and MOSFET are configured as a low-side driver, but the
load is connected in series with ground. The high speed
normally associated with low-side drivers is retained in this
circuit.
Power for the MIC5010 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
diode limits the supply to 18V. When the MIC5010 is off,
power is supplied by a diode connected to a 15V supply.
The circuit of Figure 8 is put to good use as a barrier
between low voltage control circuitry and the 90V motor
supply.
Half-Bridge Motor Driver
(Figure 11). Closed loop control
of motor speed requires a half-bridge driver. This topology
presents an extra challenge since the two output devices
should not cross conduct (shoot-through) when switching.
Cross conduction increases output device power dissipa-
tion and, in the case of the MIC5010, could trip the over-
current comparator. Speed is also important, since PWM
control requires the outputs to switch in the 2 to 20kHz
range.
The circuit of Figure 11 utilizes fast configurations for both
the top- and bottom-side drivers. Delay networks at each
input provide a 2 to 3碌s dead time effectively eliminating
24V
Applications Information
(Continued)
15V
33k鈩?/div>
33pF
100k鈩?/div>
MPSA05
10mA
Control Input
4N35
100k鈩?/div>
1k鈩?/div>
To MIC5010 Input
Figure 8. Improved
Opto-Isolator Performance
occurs, the circuit breaker shuts off. The breaker tests the
load every 18ms until the short is removed, at which time the
circuit latches ON. No reset button is necessary.
Opto-Isolated Interface
(Figure 8). Although the MIC5010
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
MIC5010 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 MIC5010
will turn OFF.
Fault-Protected Industrial Switch
(Figure 9). 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
24V
MIC5010
100k鈩?/div>
ON
CR2943-NA102A
(GE)
OFF
20k鈩?/div>
1 Inhibit
2 NC
3 Input
4 Thresh
5 Sense
6 Source
7 Gnd
Fault 14
V+ 13
NC 12
C1 11
Com 10
C2 9
Gate 8
100鈩?/div>
5m鈩?/div>
330k鈩?/div>
15k鈩?/div>
LVF-15 (RCD)
LOAD
+
10碌F
IRFP044 (2)
Figure 9. 50-Ampere
Industrial Switch
5-98
April 1998
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