Inquiry Regarding LVPRE in FS26 Documentation

[IHCHEN]

Hello,

While reading through the FS26 Datasheet 4.0 document, I noticed a discrepancy regarding the LVPRE in Figures 78 and 79. These figures indicate the usage of a 1.0uH inductor, whereas Table 161 in the document specifies 10uH. Could you please clarify which value is correct?

Additionally, there seems to be inconsistency regarding the LVPRE_DCR_450kHz specification. Table 161 lists it as 75mΩ, whereas Table 160 mentions RDCR_LPRE as 60mΩ. Could you please confirm which value is accurate?

Thank you.

[JozefKozon · Accepted solution]

Hello IHSIANG,

I have checked older FS26 datasheet revisions (2.0, 2.2 and 3.0) and in all the LVPRE value for 455kHz is 10uH. Also in an EVB schematics 10uH is used. I apologize for this and I have reported this typo to a responsible team. 

JozefKozon_0-1707978655398.png

JozefKozon_1-1707978729210.png

As for the RDCR value, in our KITFS26AEEVM and S32K3X4EVB-T172 EVBs, XAL5050-103ME inductor with RDCR 41 to 45mOhm is used. 

JozefKozon_2-1707979111210.png

So you can go with the lower 60mOhm value. 

With Best Regards,

Jozef