SLUSD37E October 2017 – November 2019 UCC28056
Cycle-by-cycle peak current protection (Ocp1) terminates the on-time (TON) duration early if the current sense voltage rises above 0.5 V. This current protection method limits the peak inductor current, thus avoiding inductor saturation or damage to the power stage. When cycle-by-cycle current limit is active, it impacts Line current distortion, but in all other respects normal switching operation continues and the controller maintains output regulation.
The controller applies leading edge blanking to the current sense voltage signal. This application ensures that the leading edge current spike caused by discharging CDE does not cause the Ocp1 comparator to terminate the DRV pulse too early.