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LM5039: Application circuit using LM5039

Conor
Guru 11315 points
Part Number: LM5039

Tool/software:

Hi,

I have experience using LM5039 to control a push-pull converter. Is it possible to use one LM5039 to operate two single-ended forward converters?

Thanks,

Conor

  • 0 in reply to Steven Mappus1
    Guru 11315 points

    Are there any example circuits or reference documents for the above?

  • 0 in reply to Conor
    TI__Mastermind 31595 points

    Conor,

    LM5039 has an asymmetrical output where each duty cycle is D up to Dmax=50% (less in practice and more like 45%). You cannot control the duty cycle of each output independently, if this is your intent. Likely we will not find a refence design example for such a use case but you can always search the TI Reference Design database here.

    Regards,

    Steve

  • 0 in reply to Steven Mappus1
    Guru 11315 points

    Hi Steve,

    I understand that the LM5039 cannot be controlled independently.

    I also searched the database, but could not find any actual reference circuits. There is no detailed documentation on how to connect and control the LM5039 HO/LO to separate converter FETs, so I don't know how to design it. Any advice would be greatly appreciated.

    Thanks,

    Conor

  • 0 in reply to Conor
    TI__Mastermind 31595 points

    Conor,

    You are  proposing to use the controller in a way it was not intended. This is why you will not find any guidance or reference design examples. There are many issues that must be overcome with your proposed LM5039 use but that's not to say it can't be made to work by designing external circuits. You have not stated what you are ultimately trying to accomplish so I am unable to make a good suggestion.

    "one LM5039 to operate two single-ended forward converters?"

    Regards,

    Steve