ZHCSNL3A December 2021 – November 2023 TPSM8D6C24
PRODUCTION DATA
The voltage on VOSNS pin is monitored to provide output voltage overvoltage (OV) and undervoltage (UV) protection. When VOSNS voltage is higher than the OV fault threshold, OV fault is declared and the low-side FET is turned on to discharge the output voltage and eliminate the OV condition. The low-side FET remains on until the VOSNS voltage is discharged to 200 mV divide by the internal feedback divider as programmed by (29h) VOUT_SCALE_LOOP. Once the output voltage is discharged, the output is disabled and the converter times out and restarts according to the (41h) VOUT_OV_FAULT_RESPONSE PMBus command. When VOSNS voltage is lower than UV fault threshold, UV fault is declared. After an initial delay programmed by the (45h) VOUT_UV_FAULT_RESPONSE PMBus command, the output is disabled and the converter times out and restarts according to the (45h) VOUT_UV_FAULT_RESPONSE PMBus command.
The output UV and OV fault thresholds and fault response are set through PMBUS. The UV and OV fault response can be set to shutdown, restart, or continue operating without interruption.