UCC2897A: how to calculate the capacitor for a low side active clamp forward?

Ras Sharif50

Genius 3455 points

Part Number: UCC2897A

Dear All,

please consider the schematics:

how can i calculate the capacitor for the active clamp circuit?

Best Regards,

Ras

over 6 years ago

0 John Griffin1 over 6 years ago

TI__Mastermind 34465 points

Hello Ras,
Section 4.3.2 of the attached document describes the process in calculating the value of the clamp capacitor.
www.ti.com/.../slua535.pdf
Alternatively you can use the Excel calculator to calculate the value based on your design requirements.
Regards
John

0 Peter Meaney over 6 years ago in reply to John Griffin1

TI__Mastermind 31580 points

active clamp txer reset high or low side.pdfHi Ras

I also found this apps note which covers high and low side reset techniques, see section 6 for the clamp cap calculation.

Regards

Peter

0 Ras Sharif50 over 6 years ago in reply to Peter Meaney

Genius 3455 points

Hello John and Peter,
thank you for the replies.

another question:
can i use the low side reset technique for a 400V ( input voltage ) application?

Regards,
Ras

0 John Griffin1 over 6 years ago in reply to Ras Sharif50

TI__Mastermind 34465 points

Hello Ras,
This new question requires a new thread.
I am going to close out this post.
Regards
John

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UCC2897A: how to calculate the capacitor for a low side active clamp forward?