Paged fault conditions apply only to a single channel and are duplicated for channel A and channel B. Paged fault conditions only cause one channel to shut down when triggered. For latch-off faults, the enable for that channel must be toggled to re-enable power conversion. For example, if channel B experiences an overvoltage fault, only channel B stops power conversion, and channel B must be commanded to disable power conversion, and re-enable power conversion to continue normal operation.

Shared fault conditions apply to channels A and B simultaneously. Shared fault conditions cause both channels A and B to shut down when triggered.

Warning conditions do not cause any interruption to power conversion. They are meant to inform the system host of changing conditions so that it can react prior to a fault being triggered. Warnings do conditions set associated PMBus status bits and trigger the SMB_ALERT# signal when not masked.

Fault conditions set to the ignore response are treated as warnings. Faults set to the ignore response do not cause any interruption of power conversion but do still cause status bits and SMB_ALERT# to trigger.

Fault conditions set to the latch-off response cause power conversion to stop immediately. The channel must be commanded to stop power conversion then restart to continue operation. Start-up from a latch-off fault is identical to a normal power-up and the configured TON_DELAY is still observed. The RSTOSD option in MISC_OPTIONS controls whether the boot voltage returns to its last programmed value, or boots to its VBOOT value.

Fault conditions set to the hysteretic response cause power conversion to stop immediately. When the fault condition no longer exists, the TPS53676 attempts to restart immediately. The configured TON_DELAY is still observed.

Fault conditions set to the hiccup response cause power condition to stop immediately. After a hiccup wait time, 25 ms by default, TPS53676 attempts to re-enable power conversion. The configured TON_DELAY is still observed. If the fault condition has disappeared, the start-up attempt succeeds and power conversion continues. Otherwise, the process repeats indefinitely. The RSTOSD option in MISC_OPTIONS controls whether the boot voltage returns to its last programmed value, or boots to its VBOOT value.

The TOFF_DELAY is not respected during any fault shutdown response.