Fly-back transformer design for Critical Mode operation using UCC28810

Vishal Panchasara1

Other Parts Discussed in Thread: UCC28810

Hi All,

Did any one gone through design calculation for Fly-back transformer for UCC28810 IC.

I have read datasheet of UCC28810 but there is no design note or design calculation information

to calculate basic components values. like Fly-back transformer Primary Inductance or secondary inductance.

The UCC28810 will provide high PF based on the input voltage (full wave rectified) while varying the frequency of the gate output.

Which design consideration or equation should use to design this parameter.

If any one have idea about this, please provide me any document or any support from TI.

Regards,

Vishal P

0 Lisa Dinwoodie over 12 years ago

Here is a MathCAD file that was used for the transformer for the UCC28810EVM-001 circuit. If you don't have MathCAD, I can send the pdf version.

0 Lisa Dinwoodie over 12 years ago in reply to Lisa Dinwoodie

Just in case...here's the pdf of the MathCAD file.

0 Vishal Panchasara1 over 12 years ago in reply to Lisa Dinwoodie

Hi Lisa,

Thank you so much for your response related to design calculation.

Now, i can verified calculated values which i have done myself with this design.

This really help me to find the right Lp and Ls for my design.

I have still one more question if you can help me.

How to calculate other design components like "Primary Soft start circuit", "Zero Crossing" and "Leading Edge Blanking".

Is there any design notes or any calculation methods for the UCC28810 design ?

What will be the maximum output power support by UCC28810 using Flyback topology with >80% efficiency and > 0.9 PFC ?

Thanks you so much again for your response.

Regards,

Vishal

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