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SLVC225 - Creating a Split Rail Power Supply from a Step-Down Regulator Excel tool unavailabe?

Bill Drumheller
Prodigy 135 points
Other Parts Discussed in Thread: TPS54160A

Hello,

In the Application Report SLVA369A Creating a Split Rail Power Supply with a Wide Input Voltage Buck Converter, an excel tool is mentioned in the reference.  This tool is SLVC225.  I do not see the ability to download that file on TI's web site.  Is this still supported and available?  And if so, could I receive a copy?

Thanks,

Bill D.

  • 0
    TI__Mastermind 35115 points

    Hi Bill,

    It looks like the link became broken when the excel was updated. Here's a direct link to the excel file.

    Best Regards,
    Anthony

  • 0 in reply to Anthony F
    Prodigy 10 points
    Hi Anthony,

    can I use the TPS54160A for +/-15V from 18V to 30V Input Voltage. The max Output Current is 250mA but not symmetric.
    I need the +/- Voltage for an Current Sensor.
    If an Positiv Current is drawn than the positive Voltage see the current and if an negative current is drawn than the negative Voltage see current.

    Thanks,

    Yasar A.
  • 0 in reply to Anthony F
    Prodigy 40 points

    Please elaborate on the following discrepancy:

    1) In SLVA369A–October 2009–Revised October 2012   Eq 10, 13 and 15 use (2*Fsw*Lo) as a denominator. In the excel file, however, formulas in C70, C73, C75 lack the multiplication by 2 (ex. ...(B53*C68))

    2) On the other hand SLVA369A states that 

    The rms currents for the inductor windings
    from Equation 16 and Equation 17 are 0.742 A and 0.388 A, respectively

    These are the results in the excel file as well (C76,C77). So application note and excel file agree on the results. It will not be the case if the excel file actually uses the formula proposed by the app note:)

    If I dont see the elephant here, pls let me know, otherwise pls advise on the right calculation. I still need to be sure of the proper rms current when choosing my inductance.

  • 0 in reply to Yav Mit
    TI__Guru**** 191445 points
    The app mote has "2 x" in the denominator. The calculator has "0.5 x" in the numerator. Same.
  • 0 in reply to JohnTucker
    Prodigy 40 points

    That applies only to eq. 10 (cell C70)  - I agree - a little elephant,,:) Sorry about that.

    But that is not the case with eq. 13 (cell C73) and eq. 15 (cell C75) : equations have additional  1/2

    In that case in those cells you should change 0.5 to 0.25, or you should remove 1/2 from eq. 13 i eq.15. Which is it?

    Addendum:

    Another issue:

    Eq.23. calculating Power dissipation states: Pdevice=Iswrms^2xRhs+....   The corresponding cell C83 adds another multiplayer : =B40*E62*(C84^2)+..  (that is Dnom).

    Please advise.

    Regards

    Yavor Mitev