WEBENCH® Tools/LM3481: How to use webence for exteranl bias circuit. Or you can tell how to determine the inductance for this circuit

Johnson Pi

Part Number: LM3481
Other Parts Discussed in Thread: LM5045, LM5046

Tool/software: WEBENCH® Design Tools

TI Support,

I want to use Webench design tool to design a septic circuit from (30Vdc to 150Vdc) to 48Vdc (8A load current). I have external bias circuit (12V) for Vcc. Due to your webence default, I cannot use an external bias to make your design working. Please advise it.

If you have other better IC for this application, please let me know.

Thank you very much!

Johnson Pi

over 7 years ago

0 Johnson Pi over 7 years ago

Intellectual 470 points

Due to my output current is pretty high, then it is difficult to find a transformer which has two coupled inductors. In the LM3481 specification/data sheet mentions that I can use two discrete inductors or two windings of a coupled transformer. I don't understand how it can be possible?? Please advise.

Thanks.

Johnson

0 Youhao Xi over 7 years ago in reply to Johnson Pi

TI__Guru* 78400 points

Your total load is close to 400W. Recommend to consider a half bridge or full bridge.

0 Johnson Pi over 7 years ago in reply to Youhao Xi

Intellectual 470 points

what IC/controller you suggest?

0 Youhao Xi over 7 years ago in reply to Johnson Pi

TI__Guru* 78400 points

One example is the LM5045 or LM5046. They are 100V rated, but you can following the method shown in Fig. 21 for >100V application. Please create a new post for LM5045 or LM5046, then the responsible engineers will support you.

0 Johnson Pi over 7 years ago in reply to Youhao Xi

Intellectual 470 points

Thank you very much!

Yes, when I have some questions regarding LM5045/46, I will create the new post.

Johnson

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WEBENCH® Tools/LM3481: How to use webence for exteranl bias circuit. Or you can tell how to determine the inductance for this circuit