
MIC5013
Applications Information (Continued)
12V
Micrel, Inc.
Sense Gate 6
100k?
100nF
MPSA05
100k?
10k ?
100k?
MIC5013
1 Input Fault 8
2 Thresh V+ 7
20k ? 3
+
10μF
4 Source Gnd 5
IRFZ40
100 ?
1N4148
22m ?
CPSL-3 (Dale)
15V
10k ?
LOAD
100k?
33pF
33k ?
To MIC5013 Input
MPSA05
Figure 7. 10-Ampere
Electronic Circuit Breaker
10mA
Control Input
4N35
100k?
1k ?
Figure 8. Improved
Opto-Isolator Performance
24V
100k?
for only a short period of time (≤25ms). If the load is left
energized for a long period of time (>25ms), the bootstrap
capacitor will discharge and the MIC5013 supply pin will
fall to V+ = V DD –1.4. Under this condition pins 3 and 4 will
be held above V+ and may false trigger the over-current
circuit. A larger capacitor will lengthen the maximum “on”
time; 1000μF will hold the circuit up for 2.5 seconds, but
requires more charge time when the circuit is turned off.
The optional Schottky barrier diode improves turn-on time
on supplies of less than 10V.
24V
ON
CR2943-NA102A
( GE )
OFF
20k ?
MIC5013
1 Input Fault 8
2 Thresh V+ 7
3 Sense Gate 6
10μF
+
4 Source Gnd 5
IRFP044 (2)
100 ?
330k?
15k ?
Figure 9. 50-Ampere
Industrial Switch
5m ?
LVF-15 (RCD)
LOAD
MIC5013
10
July 2005