UCC28070A: About UCC28070A calculation tool question

Jimmy WANG

Genius 4055 points

Part Number: UCC28070A
Other Parts Discussed in Thread: UCC28070

Hi team,

Can I use the below tool to cal for bridgeless topology? Or something that needs attention.

UCC28070 Excel Applications Design Tool

over 3 years ago

0 David Huang33 over 3 years ago

TI__Genius 9140 points

Hi Jimmy,

since the engineer is on holiday this week. please allow the delay reply until next Monday.

0 Ray DiCecco over 3 years ago in reply to David Huang33

TI__Genius 11350 points

Hi David, I'm still in the office today and tomorrow, but thank you for your consideration. All US-based will be OOO on Thursday & Friday.

Hello Jimmy, the UCC28070 calculator cannot be used for bridgeless design by itself. The tool calculates inductor current and ripple assuming interleaved phases, whereas for (semi) bridgeless PFC, each power leg needs to handle 100% of the current for half of the cycle and without interleaved ripple cancellation. For the power-stage portion of the design, you will need to refer to Section 4, equations (2) - (6) in SLUA479 (https://www.ti.com/lit/pdf/slua479).

Regards,

Ray

0 Jimmy WANG over 3 years ago in reply to Ray DiCecco

Genius 4055 points

Hi Ray,

Thanks for your reply, but you provide UCC28070 300-W Interleaved PFC Pre-Regulator Design. Is it correct?

Besides the inductor calculate method, Can this tool be used to calculate UCC28070 peripheral parameters for bridgeless PFC. thx

+1 Ray DiCecco over 3 years ago in reply to Jimmy WANG

TI__Genius 11350 points

Hi Jimmy, assuming hand-calculating the entire power chain based on single-phase operation (boost inductors, capacitors, CT turns ratio, etc) , the other calculations should hold.

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UCC28070A: About UCC28070A calculation tool question

UCC28070 Excel Applications Design Tool