UCC2897A: Design review for UCC2897A active clamp 250W...

Dear Sir,

May I have your suggestion for customer design for 250W active clamp design?

Thanks.

Design spec.

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AC19.2V ~ 31.2V ( Vnom = AC24V )

PFC boost to 60V

DC Output 12V/21A

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PFC Transformer : PQ3220 / 3.3uH / 4Ts

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Forward Transformer

1. Isolation transformer :

PQ3220 /  Np : Ns : Naux = 4Ts : 2Ts : 2Ts / Lp : 13.5uH

Na (匝數比) : 2

1. Secondary side energy storage inductor :

- N1^2*AL = N1^2 * 7310n = 13.33uH = N = 3.3Ts  use 4Ts

PQ3220 ( AL = 7310 )  / 13.33uH / 20Ts

- 

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1. Please help to check if all 3  spec. of PQ3320 (corePC40) is OK or not?
2. CS (how to calculate CT/ how to calculate Aux inductor?

1. Is there any problems/suggestions for the schematics?

ThThanks.

7752.UCC2897A_SLUC662_12V_21A.xlsx

Boost PFC Design 20210105.xls

AC19.2V_31.2V PFC for 250W.pdf

BT_forwad DC12V_21A for 250W.pdf