UCC28070A: UCC28070A error in a cell of the excel tool

LAPORTE JEAN-YVES

Part Number: UCC28070A
Other Parts Discussed in Thread: UCC28070

Hello, I found an error, it seems to me, in the excel tool allowing to calculate the various components around the UCC28070A. This is for the CTA calculation (line 53 of the spreadsheet).
The datasheet indicates page 36 -> CTA=1/(RTA*Fs*3) and the spreadsheet does the calculation by taking Rs and not RTA.
Can you confirm this point?

Regards.

JYL

over 3 years ago

+1 Harish Ramakrishnan5 over 3 years ago

TI__Mastermind 24375 points

Hi Laporte,

Thank you for the query on UCC28070 and pointing out the differences between the spreadheet and the datasheet.

I think you should use Rs which is used in the spreadsheet.

Rs is used because I believe it is simplified from the parallel combination of Rta and Rs, with Rs normally being much, much smaller than Rtx and the parallel value is dominated by Rs.

Hope this helps.

Regards,

Harish

+1 LAPORTE JEAN-YVES over 2 years ago

Prodigy 100 points

Ok Harish, thanks for this precision.

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UCC28070A: UCC28070A error in a cell of the excel tool