Application Note
19 of 63
V 1.2
2018-12-12
5 Output PMIC Controller/ IRPS5401
User guide with DB295 and DB296 demo boards
lower), the new relative threshold will be 50 mV. The user can’t cause a UVP fault by setting the
VOUT_COMMAND to a value less than or equal to the VOUT_UV_FAULT_LIMIT.
The relative UVP threshold will always be 50 mV below the VOUT_COMMAND value in the scenario described
above with the VOUT_COMMAND being decreased to the VOUT_UV_FAULT_LIMIT or below.
The user should set the VOUT_UV_FAULT_LIMIT value such that it is < 400 mV below the smallest
VOUT_COMMAND value that will be used in the application.
Each loop reports out the relative UVP threshold in Read Only (RO) register xx56h [6:4]. 0 = 50 mV, 1 = 100 mV …
up to 7=400 mV. If 1:2 scaling is used, the relative UVP threshold is 2x the value shown.
The UV_WARN_LIMIT is not a relative threshold. It is the absolute value set by the user. The user can cause a
UV_WARN flag by sending a VOUT_COMMAND less than the UV_WARN_LIMIT.
4.9
Over Temperature
The IRPS5401 has two (2) on die temp sensors; one for SW-A and B and one for SW-C, D and the LDO.
A READ_TEMPERATURE_1 command to SW-A or SW-B will report the same value. A READ_TEMPERATURE_1
command to SW-C, D or the LDO will report the same value.
The OT_WARN_LIMIT and OT_FAULT_LIMIT can be set to any value from 0°C to 255°C in increments of 1°C.
OT_WARN should be set less than OT_FAULT.
The OT_FAULT_RESPONSE can be set to IGNORE, SHUTDOWN and latch off, or SHUTDOWN and auto recover
when temp decreases (also known as INHIBIT).
Figure 25
Command set
