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PMP21529: Can't find suitable flyback transformer to replace XFMRS. Inc, 031-00019

Part Number: PMP21529


I'm currently based in Singapore and would like to build this reference design to evaluate a 4-switch converter. I am unable to find a suitable part to replace the auxiliary flyback transformer employed in this design.

The description of this part in the BOM is: 

540uH, 031-00019, XFMRS, Inc., Auxiliary Flyback Transformer, 540 uH, SMT SMD, 8-Leads, Body 400x300mil, Pitch 79mil

Could you ever so kindly recommend some alternative parts for me please?

Thank you,