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TPS54260DGQ switching frequency

Mark Santacesaria68
Prodigy 100 points

does the switching frequency affect the input voltage range?  if yes, then how?  how about heating?  thanks

  • 0
    TI__Genius 16870 points
    HI Mark,

    I am moving this post for better service from the experts that know this device.
  • 0 in reply to Mark Santacesaria68
    TI__Guru**** 191445 points
    Generally switching frequency affects primarily three things: inductor value, switching losses and on/off times

    Inductor value is given by: L = (Vout/Vin)* (Vin-Vout) / (Fsw*desired inductor ripple current)
    As you can see Vin also appears in that equation so there is a relationship there.

    Switching losses increase with both Vin and Fsw

    Duty cycle is set basically by Vout / Vin and as Fsw increases the on time and off time both decrease. At some point you may require an on time below the minimum on time. In that case either the switching frequency or input voltage range must decrease.

    I'm sure there are other factors as well such as perceived eco-mode threshold current, but those three come to mind as probably the most significant.