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LM5180: 48V to 64V/1.5A as Boost converter

Hideki Hayashi1
Expert 7320 points
Part Number: LM5180
Other Parts Discussed in Thread: LM5185, LM5158, LM5156

Hi team,

Is LM5180 able to work for generating 64V/1.5A from 48Vin as boost converter? Datasheet only shows flyback topology so I asked.

Current limit seems no margin.

Regards,

Hayashi

  • 0
    TI__Guru 74410 points

    Hi Hayashi-san,

    Thank you for reaching out.  This is about 100W and I believe it is beyond the LM5180's power capability because it has internal fixed current limit at 1.5A.

    In stead, you may consider the LM5185, which is a controller employing external MOSFET to allow you to scale the power to higher level.  Please also use our design calculator to help the customer in their design:

    https://www.ti.com/tool/download/LM5185-DESIGN-CALC

    Thanks,

    Youhao

  • 0 in reply to Youhao Xi
    TI__Expert 7320 points

    Hi Youhao,

    Understood. I will discuss LM5185 option with customer. 

    By the way, when I runs Webench, I found LM5158 option as below, that is also integrating FET. Is that work?

    https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=34118CEB2E5E2A16

    Regards,

    Hayashi

  • 0 in reply to Hideki Hayashi1
    TI__Guru 74410 points

    Hi Hayashi-san,

    The LM5158 is another device able to support Boost, Sepic and Flyback, but in flyback it either requires the opto coupler or an aux winding on the transformer to achieve output regulation.  It cannot support 100W, either.   The controller version of it is LM5156, but it also need opto or an aux winding.  

    Thanks,

    Youhao