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TIDM-RESLLC-DCDC: Frequency modulation and Phase-shift modulation

Part Number: TIDM-RESLLC-DCDC

Tool/software:

Hi.

I am trying to learn about resonant converter and I understand the theory how the circuits behaves, the different regions. However, I have a hard time to understand the control implementation. I always use PWM, but in this one is common to use frequency modulation to control the output. Can you guide me to understand the frequency modulation and phase-shift modulation?