How can i adjust the output voltage of the EVAL-PFC5KIKWWR5SYS ?

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fallma
Level 1
Level 1
First reply posted First question asked Welcome!

I wish to lower the output voltage of the EVAL-PFC5KIKWWR5SYS from 400V to 300V. Does someone know how to do that ? 

thanks 

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1 Solution
Anil_Y
Moderator
Moderator
Moderator
10 likes received 25 solutions authored 10 solutions authored

Dear @fallma ,

Good day!!

 

Change the voltage across the VSENSE pin in the UCC28070DW PFC controller by changing the R7 resistance value according to the voltage divider rule. According to this voltage change, PWM signals will be generated. 

Anil_Y_0-1702024591718.png

 

Note: This is not recommended.

We need to change the components to change the output voltage.

 

Thanks for understanding.

 

Best Regards,

Anil Kumar.

 

 

 

 

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3 Replies
Anil_Y
Moderator
Moderator
Moderator
10 likes received 25 solutions authored 10 solutions authored

Dear @fallma ,

Good day!!

 

As this is an interleaved boost PFC board operating in CCM mode for the input of 230V rms (325 V peak) we can get above this voltage only.

 

Best Regards,

Anil Kumar.

 

 

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fallma
Level 1
Level 1
First reply posted First question asked Welcome!

Thank you for your answer. 

My input voltage will be 180V. How low can I have as output voltage and how do I adjust it to that level ?

 

Thank you

0 Likes
Anil_Y
Moderator
Moderator
Moderator
10 likes received 25 solutions authored 10 solutions authored

Dear @fallma ,

Good day!!

 

Change the voltage across the VSENSE pin in the UCC28070DW PFC controller by changing the R7 resistance value according to the voltage divider rule. According to this voltage change, PWM signals will be generated. 

Anil_Y_0-1702024591718.png

 

Note: This is not recommended.

We need to change the components to change the output voltage.

 

Thanks for understanding.

 

Best Regards,

Anil Kumar.

 

 

 

 

0 Likes