ST STM32L4+ Series Reference Manual page 809

RM0432
26.3.7 Comparator output blanking function
The purpose of the blanking function is to prevent the current regulation to trip upon short
current spikes at the beginning of the PWM period (typically the recovery current in power
switches anti parallel diodes).It consists of a selection of a blanking window which is a timer
output compare signal. The selection is done by software (refer to the comparator register
description for possible blanking signals). Then, the complementary of the blanking signal is
ANDed with the comparator output to provide the wanted comparator output. See the
example provided in the figure below.
Current limit
Raw comp output
Blanking window
Final comp output
Figure 185. Comparator hysteresis
INP
INM
INM - V hyst
COMP_OUT
Figure 186. Comparator output blanking
PWM
Current
Comp out
Blank
RM0432 Rev 6
Comparator (COMP)
MS19984V1
Comp out (to TIM_BK ...)
MS30964V1
809/2301
816