LM5160-Q1: LM5160-Q1

AJAY CHOLE

Part Number: LM5160-Q1

Dear TI Team,

I have designed a Fly-buck converter (based on LM5160-Q1) using Webench Design Tool. The application is Auxiliary Power Supply for Hybrid Solar PV Inverter. The input voltage range is 44V to 54V (actually a 48V battery). The regulated isolated output voltage required is 15V (Vout_iso). The output current is Io=1.5A. The design file is here (WBDesign42.pdf). My question is how to connect Wurth Electronics 749196541 transformer (T1) to obtain Lp=68.4 uH ? It has triple primary and triple secondary winding. The datasheet of this transformer is here, (749196541-539790.pdf). I request you to give me the connection diagram to apply this transformer for Fly-buck configuration. Do we need to connect all primary windings in series and secondary windings in series?

Please also go through the design and confirm that the Webench design does not require any modification. I will straightway implement this design in hardware.

Thanks and Regards,

~Ajay M. Chole

over 5 years ago

0 Arief Hernadi over 5 years ago

TI__Mastermind 23835 points

Hi,

I am not sure how the transformer should be connected because if i look at the datasheet, the inductance is 7.6uH and even if you connect all in series it looks like you will get less than 68.4uH.

Let me forward this question to webench group

Thanks

-Arief

0 David Baba over 5 years ago

TI__Mastermind 33050 points

Hello Ajay,

See attached, hope this helps?

0 AJAY CHOLE over 5 years ago in reply to David Baba

Prodigy 210 points

Dear David,

I am sorry, it is still not clear to me why you have three-squared*7.6uH. Please elaborate (give some notes) or online link of this formula.

Is it because all the three primaries are on the same core?

I request you to through the design (0882.WBDesign42.pdf)? Is it okay? I am going to implement this in hardware to produce V_outiso=15V.

Thanks and Regards,

~Ajay M. Chole

0 AJAY CHOLE over 5 years ago in reply to David Baba

Prodigy 210 points

Dear David, however thanks for the connection diagram. Regs. Ajay

0 David Baba over 5 years ago in reply to AJAY CHOLE

TI__Mastermind 33050 points

Hello Ajay,

Lp = N^2*AL, where AL in inductance per turn and N is the number of turns. This is a commonly used equation in magnetic design. Seeing as the Datasheet provides the inductance per winding, the formula stated above still applies because the wingdings are on the same core.

I checked the WeBench design and it looks OK to me.

Hope this helps?

0 AJAY CHOLE over 5 years ago in reply to David Baba

Prodigy 210 points

Dear David:

Thank you very much for your explanation and confirmation that Webench Design is OK.

Best Regards,

~Ajay

Power management

Power management forum

LM5160-Q1: LM5160-Q1