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TINA/Spice/UCC28250: how to determine ramp resistance and capacitance in ucc28250

gu chenjie
Prodigy 110 points
Part Number: UCC28250
Other Parts Discussed in Thread: TINA-TI

Tool/software: TINA-TI or Spice Models

I have a 300v to 48v push-pull dc-dc using UCC28250. because the input voltage already higher 75V, Can you let me know how to determine ramp resistance and capacitance? and how to select premary-side ovp resistance?