UCC28740: flyback design with output adjustable

user5767292

Part Number: UCC28740
Other Parts Discussed in Thread: UCC28600

Dears:

I would like to design a power by UCC28740 with one fixed transfomer, and 75V-140VDC input, output is adjustable between 10V - 110VDC, then drive a capacitive load by H-bridge.

An extra DAC connect to FB that help to set output change between 10V - 110V.

I did that adjustable output voltage design on buck/boost before, but I'm not sure it is still OK for flyback deisgn ot not. Is that design possible?

over 4 years ago

0 Yunsheng Qu over 4 years ago

TI__Genius 9790 points

Thanks for your interest in TI here. I've contacted the appropriate product group. You should hear from them soon.

0 user5767292 over 4 years ago in reply to Yunsheng Qu

Prodigy 40 points

Thank you!

0 Jaden Ning over 4 years ago in reply to user5767292

TI__Expert 7080 points

Hello,

For such wide output voltage range , I'd like to suggest you use UCC28600 instead of UCC28740. Since UCC28740 has limitation on maximum duty cycle.

While UCC28600 don't have it . then the transformer design will be more flexible .

Thanks.

0 user5767292 over 4 years ago in reply to Jaden Ning

Prodigy 40 points

Thank you

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UCC28740: flyback design with output adjustable