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UCC28950: PMP8740 design chages

Nidheesh BR

Expert 1295 points

Part Number: UCC28950

Hi,

If I am going to change the output voltage level to 75V maximum, do I need to change the Diode ratings of D23 and D25?

Thanks.

over 6 years ago

0 Colin Gillmor over 6 years ago

TI__Mastermind 25570 points

Hi Nidheesh

I'll have to check this with the designer - please be patient.

Regards

Colin

0 Nidheesh BR over 6 years ago in reply to Colin Gillmor

Expert 1295 points

Ya Sure Collin

Thanks.

0 Colin Gillmor over 6 years ago in reply to Nidheesh BR

TI__Mastermind 25570 points

Hi Nidheesh

I got a reply to your question just now.

"The switch-node “PH” pin 3 of U6 is used to create a floating voltage (V-FLOAT) that supplies the gates of high side back-to-back FETs.

Since this is a floating voltage, D23 and D25 will have the same rating (they “see” V-FLOAT” voltage, which is, worst case, 15V).

The 75V will drop across C72, since this capacitor removes the DC component."

Regards

Colin

0 Nidheesh BR over 6 years ago in reply to Colin Gillmor

Expert 1295 points

Hi Colin,

Thank you for your response. I will proceed accordingly.