WEBENCH® Tools: Enhanced LLC Transformer design seems to be undersized..

Lenin Prakash

Other Parts Discussed in Thread: UCC256303

Tool/software: WEBENCH® Design Tools

We tried to design an 500W, 500 kHz, Half bridge LLC dc-dc converter using webench. ( Input - 290 ~390 V DC, o/p - 19V @ )

I'm also attaching the Transformer design document from webench. It shows a Secondary winding RMS current of 53.7 A for which

a 31 AWG of 27 strands is given for secondary winding. A 31 AWG can carry around 0.4 A, how could 27 strands

of such 31 AWG could carry 53.7 A... Pls clarify.

And also the core size given is an EE25, even this 32AWG of 27 strands could not be terminated in those bobbins...

Thanks

Lenin.

transformer_report_1713666_213_928587316_E core.pdf

over 5 years ago

0 Harish K R over 5 years ago

TI__Intellectual 2320 points

Hi Lenin,

Thanks for reaching out to us. We will look into it & get back to you on the same.

Best Regards,
Harish

0 Sahil Gupta over 5 years ago

TI__Intellectual 1020 points

Hi Lenin

can you share with me the design report for UCC256303, i tried creating WEBENCH design for this condition-

Source - DC

Vinmin - 290 V

Vinmax - 390 V

Vout - 19 V

Iout - 25 A,

and i was not able to get the assembled transformer(core/bobbin) for this operating condition, using WEBENCH Transformer Designer ,

thanks

sahil

0 Lenin Prakash over 5 years ago in reply to Sahil Gupta

Intellectual 660 points

Hi Sahil

I have not saved that design report, when i gave the same inputs now, for the transformer it is showing as a custom design

and doesn't gives any detail about current rating and size of wire..

Thanks

Lenin.

0 Harish K R over 5 years ago in reply to Lenin Prakash

TI__Intellectual 2320 points

Hi Lenin,

You can get the designs that were created by you & share the same by following below steps

Thanks & Regards,

Harish

0 Lenin Prakash over 5 years ago in reply to Harish K R

Intellectual 660 points

Hi Harish

I'm sharing the webench design of the LLC dc-dc converter.

https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=56824D39436BFDD6

Thanks

Lenin.

0 Harish K R over 5 years ago in reply to Lenin Prakash

TI__Intellectual 2320 points

Hi Lenin,

I am unable to open design. Below is the snapshot of error FYR

Could you please re-share the design ?

Thanks & Regards,

Harish

0 Lenin Prakash over 5 years ago in reply to Harish K R

Intellectual 660 points

Hi Harish

I'm also getting the same error, when I click that shareable link. I tried multiple times i'm getting the same error

However I'm able to open the design from my login.

I'm sharing that design file.

Thanks

Lenin.

webench_design_1713666_216_851608631.pdf

0 Sahil Gupta over 5 years ago in reply to Lenin Prakash

TI__Intellectual 1020 points

Hi Lenin,

Currently the Transformer design is disabled for LLC. Sorry for the mistake that it was showing transformer design earlier.

As of now WEBENCH Transformer Designer works only for single output Fly-backs(AC/DC or DC/DC applications)

However we have a plan to extend this capability for other topologies like LLC, Active Clamp , etc as well.

thanks,

sahil

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WEBENCH® Tools: Enhanced LLC Transformer design seems to be undersized..