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TPS40210: Fixed Off time application?

Russell Wetherley1
Expert 4255 points
Part Number: TPS40210
Other Parts Discussed in Thread: UCC2800

I am looking for an upgraded PWM to the UCC2800 with an integrated soft-start and enable circuit and was able to find the TPS40210. The current UCC2800 is used in a fixed off time circuit application as is shown in an older application note. Would you know of any reason that the TPS40210 would not work in a fixed off time application? Also, there are two resistors internal to the TPS40210 that create the comparator equivalent voltage (2.65V on the UCC2800), is it possible to get values for those to calculate the timing if this component would support the fixed off time application?

Thanks!

Russell

  • 0
    TI__Guru* 78630 points
    It looks doable but I haven't seen any ref designs doing it. Can you tell the exact reason why you want to use the TPS40210 in such mode?

    I can ask our designer to look into the values of these two resistors, not sure if it worth the effort regarding our resources are very limited recently, because VDD is supposed to see a very low impedance at the external and the two resistor values themselves may not matter much.
  • 0 in reply to Youhao Xi
    TI__Guru* 78630 points
    Hi Russell,

    I got the answer from our designer and I will email you the info. So we can close this thread here.

    Thanks,