MC3392 Datasheet, PDF (8/12 Pages) Motorola, Inc – LOW SIDE PROTECTED SWITCH

MC3392
APPLICATIONS INFORMATION
Solenoid Driver
The MC3392 can be used to drive a variety of solenoid
applications similar to that of Figure 15. For example; driving
a solenoid having an inductance of 73.8 mH and a resistance
of 95 Ω from a 12 V supply will cause 240 mA of sink current
to flow with the MC3392 in the ON state. The resulting current
value is within the normal load current operating region and
will not produce a fault. Load current is paramount in any
design using the MC3392 and must be less than ISC for
acceptable operation. If the load current is greater than ISC, a
current limit fault state will exist. Operation in this state is not
destructive as the device will turn off if the Junction
Temperature (TJ) rises above 150°C. When the Junction
Temperature cools below 150°C the device will again
turn–on, with a repeat of the cycle. Careful design to
acceptable load current limits should be insured for
satisfactory operation of an application.
Figure 15. Solenoid Driver
Vin _{CMOS Input}
+
5.0V
–
Fast
Turnoff
Thermal
Shutdown
MC3392
Current
Limit
Over
Voltage
Detect
Gnd
Vout
Solenoid
+
12V
–
1.0k
Fault
+
5.0V
–
8
MOTOROLA ANALOG IC DEVICE DATA