Introduction to Digital Power Conversion
XMC4000/1000 Family
PWM Generation
Application Guide 29 V1.0, 2015-01
The ZCD Event Window (Slice3)
There is a memory function required to keep track of a ZCD event that might happen before a FOT
pulse is allowed to start, due to the f
max
-period restriction.
Instead of using an ERU, a timer slice (Slice3) can be used to define an ‘allow’ window by ‘Start-upon-
ZCD and Stop&Flush upon falling FOT’.
Figure 19 Interconnectivity between CCU4 slices for PWM FOT Control with Frequency Limits
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