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LM5116 Design Question - Output Power

Antonio Ojo
Prodigy 70 points
Other Parts Discussed in Thread: LM5116, LM5116-HT

Hi,

We have LM5116 as a candidate part for an application that requires voltage output (Vout) = 48 V and current output (Iout) = 4A. The 4A is not continuous, more of a periodic draw (about every 10 mins). The voltage input is 60-90 VDC. Is there an application note or evaluation kit that can confirm if LM5116 can support these requirements?

Regards,

Ton

  • 0
    TI__Guru 58601 points

    Hi 

    I could not find the reference design which matches with your requirement. PMP10510 might be the closest design http://www.ti.com/tool/PMP10510

    200W design is possible with a help from heat-sink/air-cooling. 

    Regards,

    EL

  • 0 in reply to EricLee
    Prodigy 70 points

    Thanks EL for the prompt reply.

    We'd just like to confirm if LM5116 will work on the mentioned output requirements. We'd like to simulate also the LM5116 circuit to confirm the feasibility. Any suggestions or recommendations on LM5116 simulation?

    Regards,

    Anton

  • 0 in reply to Antonio Ojo
    TI__Guru 58601 points
    Hi Anton

    If you create a design in WEBENCH, you can check how hot your board will get.Thermal simulation is enabled.
    As I mentioned, I think 200W design is possible with a help from heat-sink/air-cooling.Since the LM5116 is a controller. the capability of the converter heavily depends on your design.

    Regards,
    EL
  • 0 in reply to EricLee
    Prodigy 70 points

    Hi EL,

    Would WEBENCH support up to 175 deg C thermal simulation? The application is involved in downhole environment and device is exposed to temperatures 150-175 deg C.  

    Regards,

    Anton

  • 0 in reply to Antonio Ojo
    TI__Expert 6365 points

    Hi Anton,

    WEBENCH won't allow any design creation if the estimated IC junction temperature is greater than 125 deg. C per room ambient temperature.

    You can start a design with ambient temperature at 0 deg. C or below 0 deg. C. but the key limiting factor is the IC junction temperature not exceeding 125 deg. C.

    I hope this answers your quetions.

     

     

     

  • 0 in reply to Howard Chen-WEBENCH Design Center
    Prodigy 70 points
    Thanks Howard.
    We think that LM5116 would work with the load requirement we need but we're not sure on how to simulate the part at high temperatures. On how the LM5116 will work at 125-150 deg Celsius. Are there software o program available to have these temperatures simulated on the LM5116 part?
  • 0 in reply to Antonio Ojo
    TI__Expert 6365 points

    Hi Antonio,

    If the ambient environment is 150 deg.C or greater,  I don't think the LM5116 will work.

    If the ambient temperature is less than 125 deg. C., then there is a chance the LM5116 may work given that the operating frequency is kept at the lower range and the FETs selected with lowest Qg possible. However, the FET themselves and the inductor are still major heat sources and a good layout and extra copper layers will help.

    This device is setup with WebTHERM as Eric mentioned which can be helpful to identify the worst heat sources per the design inputs using a standard EVM layout (4-layer copper). It allows the user to change the ambient temperature after the design is created to simulate the thermal performance with different ambient temperature and design conditions. Also, the tool allows the user to add/delete/move copper and vias to see the impact of thermal behavior. Please give it a try and let us know if this is helpful.

     

     

  • 0 in reply to Howard Chen-WEBENCH Design Center
    Prodigy 70 points

    Using LM5116-HT would be more feasible, right?