Introduction to Digital Power Conversion
XMC4000/1000 Family
PWM Generation
Application Guide
45
V1.0, 2015-01
Synchronous Rectification Phase-Shift by Using the Timer-Load Input Function
This alternative, to phase-shift a PWM, is useful here. The CC81 timer-load input function needs to be
mapped in the interconnection matrix to be requested on every CC80 One-Match event. The
CC81CR2 register is chosen as a timer load source, acting as a type of “mailbox” for every new
phase-shift (Ref.: CC8yTC.TLS register).
The phase-shift procedure, after the interconnectivity for the timer-load function is setup, is as follows:
Each new phase-shift value must be written into the CC81CR2 register (This can be done at any
time).
On every CC80 One-Match event (at valley point), the CC81 timer will be loaded with this value.
Synchronous Rectification Control with High Resolution PWM (HRPWM)
The CC81CR1 register is used in compare mode to generate the PWM stream that Set/Clear triggers
the HRCy channel to output synchronous rectification control of the MOSFET-stage (Q
3
, Q
4
).
