Dear team,
My customer has some transformer questions and their specification is as below. Could you please help us to check it? Thank you.
- Input 100~240V,Output (6V/1A)
- Input 100~240V,Output (5V/1A)
- Input 100~240V,Output (7.2V/0.5A)
They used our UCC28910 webench to run simulation and they got those transformer parameters in the following content. Because their PCB size is limited, RM6 core size will be too big. And the transformer vendor suggests them to change core from RM6 to EP15.2. If they change the core, is there any transformer parameter that we should keep the same besides Lp and turn ratio? I also attach two core specifications at the end of post. (Ae@RM6: 37.5mm2; Ae@EP15.2: 30.76mm2.)
B65807P0000R049 (6V/1A)
Lp= 1.458 mH
Turns Ratio(Nas)=13:4
Turns Ratio(Nps)=51:4
Npri= 51.0
Naux= 13.0
Nsec= 4.0
B65807P0000R049 (5V/1A)
Lp= 1.851 mH
Turns Ratio(Nas)=15:4
Turns Ratio(Nps)=59:4
Npri= 59.0
Naux= 15.0
Nsec= 4.0
B65807P0000R049(7.2V/0.5A)
Lp= 2.352 mH
Turns Ratio(Nas)=14:5
Turns Ratio(Nps)=56:5
Npri= 56.0
Naux= 14.0
Nsec= 5.0
Thanks again
Best Regards,
Polly Chung
