TPS53676 supports two layers of input
overvoltage protection:
- Input overvoltage fault
(VIN_OVF) is a programmable threshold which sets the maximum allowed
input voltage, above which it is not safe to convert power. Detection is based
on input voltage telemetry. When the sensed input voltage exceeds this limit,
the input overvoltage fault condition is detected. Program this threshold using
the VIN_OV_FAULT_LIMIT command. TPS53676 supports values of 0 to 19 V.
- Input overvoltage warning
(VIN_OVW) is a programmable threshold which sets a warning based on the
input voltage sense telemetry. Detection is based on input voltage sense
telemetry. When the sensed input voltage for a channel exceeds this limit, the
input overvoltage warning is detected. Program this threshold using the
VIN_OV_WARN_LIMIT command. TPS53676 supports values of 0 to 19 V.
In response to the input overvoltage
fault, the TPS53676 responds according to the configured fault response in
VIN_OV_FAULT_RESPONSE. When not set to the ignore response, this causes the PWM pins
for both channels to tristate immediately. TPS53676 then sets the appropriate status
bits in STATUS_WORD and STATUS_INPUT and asserts the SMB_ALERT# line if these bits
are not masked.