MIC5013_05 Datasheet, PDF (10/15 Pages) Micrel Semiconductor – Protected High- or Low-Side MOSFET Driver

MIC5013
Applications Information (Continued)
Micrel, Inc.
12V
100kΩ
100nF
MPSA05
100kΩ
10kΩ
100kΩ
MIC5013
1 _{Input Fault} 8
2 _{Thresh V+} 7
20kΩ _{3 Sense Gate 6}
4 _{Source Gnd} 5
1N4148
+
10µF
IRFZ40
100Ω
22mΩ
CPSL-3 (Dale)
15V
10kΩ
LOAD
100kΩ
10mA
Control Input
4N35
33pF
33kΩ
To MIC5013 Input
MPSA05
100kΩ
1kΩ
Figure 8. Improved
Opto-Isolator Performance
Figure 7. 10-Ampere
Electronic Circuit Breaker
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
24V
ON
CR2943-NA102A
(GE)
OFF
100kΩ
20kΩ
MIC5013
1 _{Input Fault} 8
2 _{Thresh V+} 7
3 _{Sense Gate} 6
4 _{Source Gnd} 5
+
10µF
IRFP044 (2)
330kΩ
100Ω
5mΩ
LVF-15 (RCD)
15kΩ
LOAD
MIC5013
Figure 9. 50-Ampere
Industrial Switch
10
July 2005