Comparator (COMP) RM0444
450/1390 RM0444 Rev 5
18.3.7 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.
Figure 71. Comparator output blanking
18.3.8 COMP power and speed modes
COMPx power consumption versus propagation delay can be adjusted to have the optimum
trade-off for a given application.
The PWRMODE[1:0] bitfileds of the COMPx_CSR registers allow setting the comparators to
high speed with full power or medium speed with medium power. Refer to Section 18.6:
COMP registers.
MS30964V1
Current limit
Current
Raw comp output
Blanking window
Final comp output
PWM
Comp out
Blank
Comp out (to TIM_BK …)
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