UCC28911: Can this part be used at an input of up to 600V?

Lauren Mayfield

Expert 6890 points

Part Number: UCC28911
Other Parts Discussed in Thread: LM5021

Hi team,

The parameters indicate that Vinmax=450V, but I could not see a confirmation of the limitation in the datasheet.

Is there any reason someone could not use this device up to 600V ?

over 3 years ago

0 Yunsheng Qu over 3 years ago

TI__Genius 9790 points

Hi, Lauren

The major reason that the Vinmax is limited at 450V:

1. The breakdown voltage of internal FET of UCC28911 is 700V, the voltage stress of this FET=Vin+n*Vo+ voltage ring. If the input voltage is 600V, it is very easy to damage the internal FET.

Yunsheng

0 Lauren Mayfield over 3 years ago in reply to Yunsheng Qu

TI__Expert 6890 points

Hey Yunsheng,

Got it, understand. Do we have anything that would take that high of an input in our portfolio?

0 Lauren Mayfield over 3 years ago in reply to Yunsheng Qu

TI__Expert 6890 points

Question below regarding is there anything that would take 600V+

0 Yunsheng Qu over 3 years ago in reply to Lauren Mayfield

TI__Genius 9790 points

Hi, Lauren

The parts without high voltage startup and integrated MOSFET is fine, like LM5021.

Yunsheng

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UCC28911: Can this part be used at an input of up to 600V?