Design Goals
Supply | Load | Comparator Output Status (OUT) | |
---|---|---|---|
Operating Voltage Range | MAX Operating Voltage (VOVER) | SUPPLY < VOVER | SUPPLY ≥ VOVER |
12 V to 36 V | 30 V | VOL < 0.4 V | VOH = SUPPLY |
Design Description
This overvoltage protection circuit uses a high-voltage comparator with a push-pull output stage to control a P-Channel MOSFET that connects the SUPPLY to the LOAD. When the SUPPLY voltage exceeds the overvoltage threshold (VOVER), the output of the comparator goes HIGH and disconnects the LOAD from the SUPPLY by opening the P-Channel MOSFET. Likewise, when the SUPPLY voltage is below VOVER, the output of the comparator is LOW and connects the LOAD to the SUPPLY.
Design Notes
Design Steps
Design Simulations
DC Simulation Results
Transient Simulation Results
References:
Design Featured Comparator
TLV1805-Q1 / TLV1805 | |
---|---|
VS | 3.3 V to 40 V |
VinCM | Rail-to-rail |
VOUT | Push-Pull |
VOS | 500 µV |
Hysteresis | 15 mV |
IQ | 135 µA |
tPD(HL) | 250 ns |
TLV1805 |
Design Alternate Comparator
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