• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 519 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS23754 transformer polarity

Michael Gilge
Expert 1720 points
Other Parts Discussed in Thread: TPS23754EVM-383, TPS23754EVM-420

We are confused wrt transformer polarity of the bias winding: The schematics on the front page of the datasheet and the TPS23754EVM-383 show all the same polarity of the transformer windings. However, on page 31 of the datasheet and also the schematics for the TPS23754EVM-420 show the polarity of the bias winding reversed. What is the correct way of wiring the bias winding?

Also, when to use a series resistor and when to use a inductance for generating VC from the bias voltage?

  • 0
    TI__Mastermind 41760 points

    Hi Michael,

    The difference is the converter topology. The 383 is an active clamp forward design while the 420 is a flyback design. Both the EVMs are correct so for your design you must use the 383 schematic and use the buck type bias winding circuit.

     Active clamp forward topologies are used typically for higher efficiency designs at the 25+W range.