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Original question:

320Vdc 600w power supply design

UCC28083D

PSENGINEER Intelux
Intellectual 260 points
Other Parts Discussed in Thread: LM25037, UCC38083, UCC28083

PROJECT - 1KW 48V TO 350V DC DC CONVERTER USING PUSH PULL TOPOLOGY

HOW TO SELECT RESISTOR VALUE (DETAIL) ON ISET PIN AND SUGGEST ANY APPLICATION NOTE REGARDING UCC28083D

  • 0
    TI__Genius 13660 points

    Hi Vinod,

    Iset pin is used to program the slope compensation current ramp by connecting a resistor, RSET.
    Please refer to page 6 in date sheet about how to select resister RSET for a desired compensating slope with a specific peak compensating ramp voltage at the CS pin.

    In general, the amount of slope compensation required in push pull to avoid sub-harmonic oscillation is equal to at least one-half the down-slope of the output inductor current, transformed to the primary. For amount of slope compensation selection, I recommend refer to sections 8.1.3 and 8.2.27 in datasheet LM25037.

    http://www.ti.com/lit/ds/symlink/lm25037.pdf 

    Sorry for that there is no application note for UCC28083, but you find a reference design for UCC38083 located here.

    http://www.ti.com/lit/ug/sluu135a/sluu135a.pdf 

    Regards,

    Teng