Revisions Affected

0, A

Details

The blanking window is typically used to mask any PWM trip events during transitions which would be false trips to the system. If an ePWM trip event remains active for less than three ePWM clocks after the end of the blanking window cycles, there can be an undesired glitch at the ePWM output.

Figure 3-1 illustrates the time period which could result in an undesired ePWM output.

Figure 3-1 Undesired Trip Event and Blanking Window Expiration

Figure 3-2 illustrates the two potential ePWM outputs possible if the trip event ends within 1 cycle before or 3 cycles after the blanking window closes.

Figure 3-2 Resulting Undesired ePWM Outputs Possible

Workaround

Extend or reduce the blanking window to avoid any undesired trip action.