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UCC28742: UCC28742 without AUX winding solution consult.

Marsh Cai
Intellectual 1675 points
Part Number: UCC28742
Other Parts Discussed in Thread: UCC28C42

Hi Experts,

Can UCC28742 work normally without AUX winding? With VDD connected to a 24V DC voltage source.  

Is there any reference design?

Will the start-up action be affected?

Is there any other concern?

  • 0
    TI__Guru 66135 points

    Hello,

    The device needs to sense the aux winding or the secondary winding.  It will not work off a DC voltage due to input under voltage lockout. 

    The UCC28C42 will work in flyback with a DC voltage.

    Regards,