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UCC24612: VDD circuit design

Che yi Su
Expert 1695 points
Part Number: UCC24612

Hi,

Spec require output define 11V/5A and 5V/2A by usb source controller define. But it need to stable work before UVP(3.6V/2A). How to design VDD circuit? There are VDD circuit design in datasheet, p12. Is it suitable for VDD circuit design when output is 3.6V/2A? Or other recommend VDD circuit design?

Spec:

Vin=85~264VAC, 47-63Hz

Transformer turns radio: 40:6 <== it can adjust.

Vout=11V/5A amd 5V/2A

Notice: stable work on 3.6V/2A before UVP.

  • 0
    TI__Expert 6080 points

    Hello Che,

    Thank you for your interest in UCC24612.

    The minimum input voltage on VDD pin is 4V to enable turn-ON, if the output voltage is less than this value please use a separate AUX winding to supply for the SR VDD voltage. The REG turn-ON threshold is also 4.5V which will also require that AUX winding to supply for voltage.

    Regards,

    Sonal