UCC28C44-Q1: Flyback Converter Design

Piyush Hirapara

Prodigy 115 points

Part Number: UCC28C44-Q1

i have been using webench power design tool for my project, which has the following specifications.

Vin:- 50 to 90 Vdc

Vout:- 12Vdc

Iout:- 10A

isolated Flyback converter topology

it showing converter with 14A peak current in the primary. that's ok but, how do I design input filter for this much current wouldn't it need a large filter capacitor.

over 5 years ago

0 Teng Feng over 5 years ago

TI__Genius 13660 points

Hi Piyush,

May I know what is the input voltage supply? Is it a AC or DC input in the simulation?

If it is a DC input, it is considered that the DC source is a constant voltage in the simulation, so you didn't see a bulk capacitor.

Regards,

Teng

0 Piyush Hirapara over 5 years ago in reply to Teng Feng

Prodigy 115 points

DC input

i am asking about EMI filter capacitor (LC filter with RC to damp across the filter capacitor)

0 Teng Feng over 5 years ago in reply to Piyush Hirapara

TI__Genius 13660 points

Hi Piyush,

All components of EMI filter are different with different switching frequency and input power, and it depends on how much attenuation you design.

So you should design EMI filter according for spec.

Regards,

Teng

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UCC28C44-Q1: Flyback Converter Design