Application Note
13 of 63
V 1.2
2018-12-12
5 Output PMIC Controller/ IRPS5401
User guide with DB295 and DB296 demo boards
Figure 14
AOT mode
There are 4 configuration registers for each switcher that need to be set so that AOT mode operates correctly.
Diode_emu_threshold is the threshold below the DAC voltage that will cause the AOT pulse to start. This is
usually set to 1
3 mV:
Figure 15
Diode_emu_threshold
diode_emu_pw is the time that the HS FET is on after AOT is activated. It is usually set to 1. The on-time will be
a function of VIN. 1 = 180 ns at 12 V and 230 ns at 8 V:
Figure 16
Diode_emu_pw
inductor_ni_thresh is the threshold that IOUT must be below before the output will try to enter into AOT mode.
If this is set to 0, the VR will never enter AOT mode even with the PMBUS command. 8 is a 0.25 A limit:
