CIRCUIT060037
Precision over-current latch circuit
CIRCUIT060037
Overview
This high-side, current sensing solution uses a current sense amplifier, a comparator with an integrated reference and a P-channel MOSFET to create an over-current latch circuit. When a load current greater than 200 mA is detected, the circuit disconnects the system from its power source. The comparator output will latch (hold the gate source voltage of the P-channel MOSFET to 0 V) until power to the circuit is cycled, since the comparator drives the gate of the P-channel MOSFET and feeds the signal back into the reference pin of the current sense amplifier.
Features
- Load current Ioc = 200 mA
- System supply typical: Vs = 24 V
- Current sense amp: gain = 20 V/V
- Comparator output status: over current: Voh = Vs
- Normal operation: Vol = Vs - 5 V
Get started
- Read the circuit design
- Download the model
Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| Circuit design | Precision overcurrent latch circuits (Rev. A) | PDF | HTML | Sep 27, 2024 | |
| E-book | An Engineer's Guide to Current Sensing (Rev. B) | Apr 12, 2022 | ||
| Selection guide | Current Sense Amplifiers (Rev. E) | Sep 20, 2021 |