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Does SwitcherPro's Vout Analysis assume (and include) 1% Vsns resistors?

Scott Schlachter
Prodigy 40 points

Hi,

I'm wondering if SwitcherPro's Vout Analysis include an assumed 1% range on the Vsns resistors (R1/R2)?  If no, do I need to compensate for the resistor accuracy by trying different R1 values in the "What If" window?  If yes, is there a way to change to 5% resistors?  Thanks,

-Scott

  • 0
    TI__Expert 3875 points

    Hi Scott,

    In the Output1 tab in SwitcherPro, the "Calculated Minimum" and "Calculated Maximum" range for "Output Voltage" does not include the worst-case (1%) variation of the Vsns (R1/R2) resistors. So, for the purpose of this calculation it would not really matter if you used 1% or 5% resistors. The calculated range would be the same.

    In most SwitcherPro topologies you can only change R1 manually in the "What If Analysis". You can change R1 manually and examine the effect on the output voltage range. Please follow these steps:

    1) In your design schematic, click on R1.

    2) Change R1 in the top left corner.

    3) After changing R1, press the "Calculate" button and SwitcherPro will snap to a known resistor value. Typically, you can find a resistor that is within 5-10% of your desired ideal R1.

    4) Once you have a new resistor value, press "Lock Components" and "Save Changes" in the "What If Analysis" dialog.

    5) Return to the main window and look at the changes to the "Analysis Tab"

    Hope this helps,

    Michael