Hello,
I have downloaded the UCD90xxx Voltage Margining Circuit Design worksheet through reading SLVA845a application notes.
My query is what to do when you do not have any pull-up resistor R1 in following figure (taken it from SLVA845a notes) as R1 is the basis of all the equations that are mentioned in application note and in the worksheet. If I not filled the R1 field all the values become null in the excel sheet.
The reason of this query is the PSU I am using in the design has only R2 from Trim pin to GND to set the output voltage. Therefore, in that case in order to margining/trimming control set by UCD90120A, is it okay to use either strong pull-up (1Kohm) or weak pull-up (10KOhm) to Vout in above figure and use that value to calculate R3, R4, and C1 values using the equations given in SLVA845a application notes?
Thanks
