7.3.13 Overcurrent Protection

Both low-side overcurrent and high-side short circuit protection are implemented. The low-side MOSFET average current is compared to the fault threshold. High-side pulses are terminated on a cycle-by-cycle basis whenever the current through the high-side MOSFET exceeds the fixed short-circuit threshold.

When either a low-side overcurrent or high-side short-circuit threshold is exceeded in a switching cycle, a counter is incremented. If no overcurrent condition is detected in a switching cycle, the counter is decremented. If the counter counts to three, an overcurrent fault condition is declared, and the output shuts down and restarts after approximately 21 ms.