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LM5145EVM-HD-20A: 11 to 65 volt input volts, output volts range 20 to 29.2. Ajustable. 10 Amp output current

James WEilletts
Prodigy 10 points
Part Number: LM5145EVM-HD-20A
Other Parts Discussed in Thread: LM5176, LM5145, LM5118

Hi can you help I have used the Webentch too to try and create a suggested design for the specification above but without any success. I have tried altering my current requirements down to 1 amp  and no design is created. All of my requirements fall within the LM5145VH criteria. What do I have wrong and is there a way or an alternate device that could do this job. 

I must add that the temperature range for the design will 0 to 65 degrees c

Any advice helpfull

I need as much current as I can get or a suggestion of devices that could be linked to provide a minimum of 10 amps to a maximum of 100 amps if stacked 

James

  • 0
    TI__Guru 73072 points

    Hi James,

    The specs in the thread title indicate that Vin-min is less than Vout, requiring a buck-boost controller such as the LM5176. For example, at 11V input with a 20V output setpoint, a buck will operate in dropout such that Vout is slightly below Vin.

    If this is a standard buck design, then you can use the LM5145 quickstart calculator to do a design.

    LM5145DESIGN-CALC Calculation tool | TI.com

    Regards,

    Tim

  • 0
    Prodigy 10 points

    Hi Timothy thank you for your reply, I belive this device is a buck boost??? Maby with all the retrys the ic has changed.

    I included the input specs in the title but I'll clarify

    In put voltage range is wide idely 10.4 volts min to use the boost feature and a max volts of 55 volts higher if possible to use the buck feature. 

    The output will be ajustable from 20 volts min to 31 volts max 

    I know we won't be able to achieve the 10 amp requirement at 10.4 volts but any current would be useful. 

    The more current we can get the better for this application we are trying to find a DC to DC with a 10 to 20 amp range

    We want to make a maximum input voltage point tracking DC to DC

    Which we will use depleted battery's to provide an input source the output of the dc to dc will be fed  into our constant current controler so we use what's left to recharge a 24 volt battery. 

    If this device is only a buck then this would explain why the Webench tool is not working 

    I'll have a look at design calculator

  • 0 in reply to James WEilletts
    Prodigy 10 points

    Hi Timothy thank you for your reply, I belive this device is a buck boost??? Maby with all the retrys the ic has changed.

    I included the input specs in the title but I'll clarify

    In put voltage range is wide idely 10.4 volts min to use the boost feature and a max volts of 55 volts higher if possible to use the buck feature. 

    The output will be ajustable from 20 volts min to 31 volts max 

    I know we won't be able to achieve the 10 amp requirement at 10.4 volts but any current would be useful. 

    The more current we can get the better for this application we are trying to find a DC to DC with a 10 to 20 amp range

    We want to make a maximum input voltage point tracking DC to DC

    Which we will use depleted battery's to provide an input source the output of the dc to dc will be fed  into our constant current controler so we use what's left to recharge a 24 volt battery. 

    If this device is only a buck then this would explain why the Webench tool is not working 

    I'll have a look at design calculator

  • +1
    Prodigy 10 points

    Just checked and the original device was the LM5118 so during the retrys something must have suggested the LM5145VH

    This device is a buck only 

  • 0 in reply to James WEilletts
    TI__Guru 73072 points

    Hi James,

    The LM5118 is a two-switch buck-boost controller. For this current level, you may want to go to a 4-switch buck-boost such as the LM5176 (55V max Vin). That part also has a quickstart file in its product folder, see here:

    LM5176 data sheet, product information and support | TI.com

    Regards,

    Tim