CIRCUIT060038
Fast-response overcurrent event detection circuit
CIRCUIT060038
Overview
This is a fast-response unidirectional current-sensing solution, generally referred to as overcurrent protection (OCP), that can provide a < 2-μs time response, tresp, overcurrent alert signal to power off a system exceeding a threshold current. In this particular setup, the normal operating load is from 80 mA to 900 mA, with the overcurrent threshold defined at 1 A (IOC_TH). The current shunt monitor is powered from a 5-V supply rail. OCP can be applied to both high-side and low-side topologies. The solution presented in this circuit is a high-side implementation. This circuit is useful in smart speakers and docking stations.
Features
- Input: Iload = 80 mA to 900 mA
- Overcurrent conditions:
- Ioc_th = 1 A
- t_resp = < 2 μs
- Output:
- Vout_oc = 1.2 V
- Vout_release = 1.18 V
- Supply:
- Vs = 5 V
- Vref = 0 V
Get started
- Read the circuit design
- Download the Low-Side OCP Source Files for SBOA297 and High-Side OCP Source Files for SBOA297
Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Circuit design | Fast-response overcurrent event detection circuit | May 27, 2019 | |
| E-book | An Engineer's Guide to Current Sensing (Rev. B) | Apr 12, 2022 | ||
| Selection guide | Current Sense Amplifiers (Rev. E) | Sep 20, 2021 | ||
| Circuit design | Overcurrent event detection circuit | Jul 31, 2018 |