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UCC28950: VBIAS PIN reference design

Eze Bayer

Prodigy 150 points

Part Number: UCC28950
Other Parts Discussed in Thread: UCC28740

Hello, I simulated a circuit based on the reference design and I am already finishing the design for production together with a previous AC-DC stage, but I don't have the circuit to generate the VBIAS voltage, do you have any reference circuit for it? thanks

over 4 years ago

0 Yunsheng Qu over 4 years ago

TI__Genius 9790 points

Hi, Eze

what kind of Vbias do you need? 12V DC voltage to power VCC of UCC28950?

Yunsheng

0 Eze Bayer over 4 years ago in reply to Yunsheng Qu

Prodigy 150 points

Hi Yunsheng, thanks for the reply, yes, I want to have a standalone design, without the need of an external 12V source

0 Yunsheng Qu over 4 years ago in reply to Eze Bayer

TI__Genius 9790 points

Hi，Eze

UCC28950 need external DC source to power VCC since there is no high voltage startup.

Normally, in real system, a Flyback stage based on UCC28740 will be designed as auxiliary power .

Yunsheng

0 Eze Bayer over 4 years ago in reply to Yunsheng Qu

Prodigy 150 points

Thanks Yunsheng