MC33164 Ver la hoja de datos (PDF) - Microsemi Corporation
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MC33164 Datasheet PDF : 7 Pages
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PRODUCT DATABOOK 1996/1997
MC33164/MC34164
5V UNDERVOLTAGE SENSING CIRCUIT
PR O D U C T I O N D ATA S H E E T
T Y P I C A L A P P L I C AT I O N C I R C U I T S
2
1.2 VREF
4
1
RESET
LOAD
FIGURE 7. — SWITCHING THE LOAD OFF WHEN
BATTERY VOLTAGE REACHES BELOW 4.3V
2
POWER
SUPPLY
R
1
RESET MICROPROCESSOR
CIRCUIT
CDLY
1.2 VREF
3
A time delayed reset can be accomplished with the addition of C .
DLY
For systems with extremely fast power supply rise times (< 500ns) it
is recommended that the RCDLY time constant be greater than 5.0µs.
VTH(MPU) is the microprocessor reset input threshold.
1
tDLY = R CDLY In
1
-
VTH(MPU)
VIN
FIGURE 8. — LOW-VOLTAGE MICROPROCESSOR RESET
2
POWER
SUPPLY
1.0k
1
RESET
1.2 VREF
3
FIGURE 9. — VOLTAGE MONITOR
4.3V
2
270
1
VCC
RL
SMP60N03-10L
1.2 VREF
3
Overheating of the logic level power MOSFET due to insufficient
gate voltage can be prevented with the above circuit. When the
input signal is below the 4.3 volt threshold of the MC34164, its
output grounds the gate of the L2 MOSFET.
FIGURE 10. — MOSFET LOW-VOLTAGE GATE DRIVE PROTECTION
Copyright © 1997
Rev. 1.5 11/97
7
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