SLUSEJ1 December 2021 TPSM8D6C24
Both low-side overcurrent (OC) and high-side short circuit protection are implemented.
The low-side overcurrent fault and warning thresholds are programmed through PMBus and sensed across cycle-by-cycle average current through the low-side MOSFET and compared to the set warning or fault threshold while high-side pulses are terminated on a cycle-by-cycle basis, if the peak current through the high-side MOSFET exceeds the 1.5× the programmed low-side threshold.
When either a low-side overcurrent or high-side short circuit threshold is exceeded during a switching cycle, an OCP fault counter is incremented. If no overcurrent condition is detected in a switching cycle, the counter is decremented. If the counter exceeds the delay selected by the Section 7.6.40 PMBus value (default = 3), overcurrent fault condition is declared and the output shuts down. Restart and timing is also defined as part of Section 7.6.40.
The output OC fault thresholds and fault response are set through PMBUS. The OC fault response can be set to shutdown, restart, or ignore.