Pca9451 single phase

[Michaelscott237]

Hey, has any one tried using the pca9451 buck 1 and 3 as single phase?

The evb doesn't seem to work for using that configuration so i thought maybe trying to design my own board with that device using buck 1,3 as single phase but i dont see any documentation for that.

Has anyone tried that and it worked?

If so, can you post a reference for that? 

[Michaelscott237]

Hey, thanks for the reply. 

I did exactly as you shown and i get 0.903 on buck 1 and 0.896 on buck3.

Did you tried using forced pwm mode on buck 3?

That what caused the problem for me before, and i don't want to try that again on a new board

[JozefKozon]

Dear Michael,

I have just tested my PCA9451A-EVK for BUCK1 and BUCK3 single phase and it works correctly. Please make sure to follow the steps in the section 3. in the Getting Started with PCA9451A-EVK when turning on the EVB. Set the J30 to 2-3 position and remove jumper from the J36 (open). 

Then please try the following configuration in the GUI. 

I have measured about that voltage on the BUCK1 and BUCK3 with multimeter. 0.91V and 0.81V. 

With Best Regards,

Jozef

[Michaelscott237]

Also it seems that nothing that i do changes something in buck3, it always stays 0.89-0.91

[Michaelscott237]

Correction, the output of buck3 is only rising up

[JozefKozon]

Hey Michael,

I apologize for a late reply. I have tested my EVB again and from the beginning the voltages were as in my previous answer, but if I left the board running for a while the BUCK3 output voltage raised from 0.81V to above 1V. Another customer placed a very same question. My colleague escalated the PCA9541 single phase configuration question to an application team in our internal community. Let's please wait for an answer from the application team to the other customer's question and I will post it here as soon as they will answer.

Thank you for your patience. 

With Best Regards,

Jozef

[Michaelscott237]

Thanks for the reply, will wait for an answer

[JozefKozon]

Hi Michael,

I have checked the internal community and the application engineer has answered to my colleague. Unfortunately the PCA9451 is indeed not suitable for single phase. I apologize for inconvenience. 

DESCRIPTION

For the PCA9451A device,  user must use dual phase work of BUCK1&3. 

With Best Regards,

Jozef

[Michaelscott237]

I see, thank you