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UCC28704: About the term "OFF-LINE"

Damith Pavithra
Expert 1125 points
Part Number: UCC28704

Hello everyone

In the ucc28704 device description page, it says off-line flyback controllar.
Does this means it cannot be operated with rectified DC from the mains?.

Thank you
Damith

www.ti.com/.../UCC28704

  • 0
    TI__Guru* 85616 points

    Hello,

    This flyback controller requires a bridge rectifier to convert the AC line to a DC voltage, that is fed to the input of the flyback controller.

    So the UCC28704 can be used with a DC input.

    Regards,

  • 0 in reply to Mike O'
    Expert 1125 points

    Hello Mike

    Thank you for the help. But thats not the question.

    I want to know what it meant by "off-line" flyback controllar.

    What is the difference between offline flyback CONTROLLAR and the normal flyback controllar.

    Thank you

    Damith

  • 0 in reply to Damith Pavithra
    TI__Guru* 85616 points

    Hello,

    The offline flyback operates off of line power and has a bridge rectifier to convert the AC voltage to DC voltage.  The flyback then steps down or up this voltage.

    However, in some applications a DC input voltage is required and just uses a DC to DC step down flyback voltage.

    Regards,