• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 436 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.

TPS23758: How TPS23758 improve load regulation

chentsu chung
Mastermind 6180 points
Part Number: TPS23758
Other Parts Discussed in Thread: TPS23755

Hi Team,

Here are some question about how TPS23758 work:

1. Does TPS23758 improve load regulation by SR topology?

2. If yes, then why use SR topology can improve load regulation, could you please help to explain it in detail?

3. Other discussion thread mention that TPS23758 is design for SR topology, so what is the consideration for PSR with SR topology? The TPS23758 predict the rectifier voltage drop so TPS23758 could overcome it?

4. If want to replace SR by diode, does TI recommend this?

Thank you very much,

C.T.

  • 0
    TI__Mastermind 41760 points

    1. Yes, in PSR the voltage drop on the secondary is important for good regulation. So SR will have much better regulation at 5V output.

    2.  Please see #1. It's because of the series element. If not using PSR, then it wouldn't matter if it was synch or nonsynch because an opto feedback would be sensing the output directly and you would get good regulation no matter what.

    3. You make a good high level explanation. Yes, this is essentially what the TPS23758 is doing; however, more specifically, it can predict the synch flyback behavior. This is why it's designed for a synch flyback only.

    4. TPS23758 cannot be used in a diode rectified PSR flyback as described in #3. If diode flyback, then we recommend TPS23755.