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TIDA-01495: Changing and trimming output voltages

Part Number: TIDA-01495

How do you change/trim the output voltage? Am I understanding it correctly that I have to change the transformer ratio to make large voltage adjustments in the LLC circuit and then use R35 to make minor adjustments? Does that mean the LLC controller just does a fixed voltage conversion (390->24) and varying the 390 volts will also vary Vout? I am designing a power supply that depending on application needs to have 6 different output voltages. It would be awesome if I can use the same design and just change a couple of resistors to change the output voltage. Changing a transformer is a bit more challenging.