This is a unidirectional current sensing solution generally referred to as overcurrent protection (OCP) that can provide an overcurrent alert signal to shut off a system for a threshold current and re-engage the system once the output drops below a desired voltage (Vout_release) lower than the overcurrent output threshold voltage (Vout_OC). In this particular setup, the sensing range is from 1.5 A to 40 A, with the overcurrent threshold defined at 35 A (IOC_TH). The system re-asserts the ALERT to high once the current has dropped below 32 A (IRelease_TH). The current shunt monitor is powered from a 3.3-V supply rail. OCP can be applied to both high-side and low-side topologies. The solution presented in this article is a high-side implementation.
Features
- Input: 1.5 A to 40 A
- Overcurrent conditions:
- Ioc_th = 35 A
- Irelease_th = 32 A
- Output:
- Vout_oc = 2.8 V
- Vout_release = 2.61 V
- Supply: