Tool/software:
Hi,
The source question and answer confirmed my assumptions as to the source of magic numbers in the VIMON and RILIM calculations.
It also states that ISET is apportioned 9:1 Imon : Ilim
I require the tolerance of this scaling factor for corner case calculations.
On first glance, it looks like it is provided in the tabulated parameters on page 7 as VGE_SET; which looks like it provides bounds on the figure of 90 used in equation 7 (p22)
(the factor of 100 arises from the specified RIMON and RSET values, 5k/50 ).
My assumption does not look to be correct.
When applied to the ILIM equation, the scale factor varies 18/100 ... 10/100 ... 3/100 and provides a commensurate wide range of limit currents;
In my specific case the OCP nominal current of 18.3A swings to 4.52A and 38.22A (Min/Max corners of all resistors, VGE_SET and ILIM_VSNS_TH).
This is so broad as to be unusable, and well outside of the simple bounds calculated by the TI LM749x0-Q1 Excel design tool;
It seems as though my assumption is incorrect or there is some design bound or paired deviation in play that makes the worst case corner selection impoissible in practice.
Can you please provide guidance on my use of the VGE_SET parameter for determining the current division tolerance, and how to calculate the corner cases of the OCP and current monitor paths.
Kind regards,
George Tzanatos.
