UCC28950 - Difference in design equation on technical documentation

Mammen

Other Parts Discussed in Thread: UCC28950

I'm trying to work on Phase Shift Full Bridge (PSFB) Converter using UCC28950 controller chip and I'm confused as to which version of technical documentation do I have to refer. The link below shows two version of the document,

Moreover, I've noticed that there is difference in equation for calculating certain parameters. For example, on the latest document, there is difference in calculation of parameters on Lmag (Equation by factor of 2), Delta ILmag ( Equation 38 by factor of 2) and Lout (Equation 68 by factor of 2)

Could you explain the reason for difference of equation? Does the same equation mentioned on older version of technical documentation is still valid ?

Hope to hear from you soon.

Many Thanks

Mammen

over 9 years ago

0 Yunsheng Qu over 9 years ago

TI__Genius 9790 points

Hi, Mammen

The two documents are different, one is datasheet, another is a userguide of 600W UCC28950EVM.

Thanks for your attention on the equation difference. please refer to below calculation tool of UCC28950 for the equation.

Yunsheng

0 Mammen over 9 years ago in reply to Yunsheng Qu

Prodigy 110 points

Hi Yunsheng,

Thanks for your response.

I was going through the spreadsheet for the design calculation and noticed that the equations refers back to technical document ( Application report SLUA560C - Revised June 2011).

Are the equations mentioned on (UCC28950 SLUSA16C Revised November 2015) still valid for design purpose ?

I really would appreciate if you could advise me on this.

Regards
Mammen