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LM5035 or LM5039 / Without Synchronous Rectification

Rohat KILI�
Prodigy 130 points
Other Parts Discussed in Thread: LM5035, LM5039

Hello;

I'm working on an isolated DC/DC converter application: 72V to 24V/6A. The topology I chose is half-bridge and I want to use LM5035 or LM5039 because they both have built-in high side gate driver outputs.

App. info suggests to use synchronous rectification switches at the secondary side for better efficiency and performance. Since the output voltage is about 24VDC, I think I don't have to use synchronous rectification.

So the question is, what if I don't use SRx outputs? Because I prefer using diodes instead.

Thanks in advance.

  • 0
    TI__Genius 9130 points
    Rohat,

    If you do not need to use the SR drive capability (if you have diode rectifiers), then you can just leave the SRx output pins open or floating.

    I hope this helps answer your question, if so please click the "verify answer" button.

    Thanks,
    Bernard