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TMS320F28384D: Change PWM switching frequency when it is running

Part Number: TMS320F28384D

Hello, 

We are working an LLC controller which needs to change the switching frequency when the converter runs. we using this the function of EPWM_setTimeBasePeriod to change the switching frequency and it does not work.

Could show me how to on line changing switching frequency? 

Best regards

Luyu