UCC28950 Delay Equation 3 vs. Figure 5

MG74275

Other Parts Discussed in Thread: UCC28950

In figure 5 the red curve for KA=0 is 250ns delay. Using equation 3 with KA=0 and RAB=13k yields 438ns. Which is correct?

over 9 years ago

0 Peter Meaney over 9 years ago

TI__Mastermind 31580 points

Hi,

I have asked one of the engineering team to look at your question.

Regards

Peter

0 Colin Gillmor over 9 years ago in reply to Peter Meaney

TI__Mastermind 25570 points

Hello

I believe you are looking at an earlier version of the UCC28950 Datasheet. We did an extensive re-write of this document recently and the new version is available on the TI website - it's now at Rev C - you can find it at http://www.ti.com/lit/ds/symlink/ucc28950.pdf

To answer your question. the 250ns figure is correct - we changed the equations used to calculate the delays. Be careful - these calculations are approximate and don't take account of any external propagation delays that you may have in - for example - a MOSFET driver.

Regards

0 MG74275 over 9 years ago in reply to Colin Gillmor

Intellectual 290 points

Thanks for the reply. I was using the Rev B datasheet and have downloaded the latest.

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UCC28950 Delay Equation 3 vs. Figure 5