PMP20878: 2nd side driver IC and transformer for ACF design

Dear team,

I am looking for PoE 12Vout/24Vout, and found we have PMP20878 and PMP21318.

We would like to use the same transformer in both two different output design.

#1

May I know is that possible to do? 

Per my understood, share the same xfmer cannot optimize efficiency at this two different output.

#2

Could you recommend a 2nd side driver IC for ACF 2nd side FET driving?

Regards,

Ben