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LMG3100R017: LMG3100R017 controller selection consult

Sean Liao (Yu-Sheng)
Intellectual 2830 points
Part Number: LMG3100R017
Other Parts Discussed in Thread: LM76005, LM5185, , LM5148

Hi sir, 

 

My customer is making PSU.

2 kinds, both are DC input:

  1. 48Vin --> 12Vout
    • Controller: LM76005
  2. 48~100Vin --> 12Vout
    • Controller: LM5185

 

Can LMG3100R017 compatible with the controller? How to connect and design the circuit? What spec in datasheet should I check if the controller and GaN can be compatible?

Thanks a lot!

 

  • 0
    TI__Intellectual 860 points

    Hi Sean,

    I see that the device LM76005 is a DC-DC converter having integrated FET. So, we can't use this with LMG3100.

    And LM5185 is  flyback controller.  What is the topology in case of 48~100Vin --> 12Vout?

    We should select the controller based on features like topology, voltage and current ratings, switching frequency , duty cycle limitations , the controller's gate drive specifications, etc.

    LM5148 will be a good fit for Vin range up to 80V for buck converter.  Please see a top level connection diagram below:

    I hope this answers your question.

    Thanks & Regards,

    Ruchika

  • 0 in reply to Ruchika Sinha
    TI__Intellectual 2830 points

    Hi Ruchika, 

    For the LM5185, how should I know if the driving voltage and current is enough for LMG3100?

    From where and which spec in datasheet?

    Besides, can I use one LMG2100 HB GaN instead?

    Thanks a lot!

  • +1 in reply to Sean Liao (Yu-Sheng)
    TI__Intellectual 860 points

    Hi Sean,

    We can check for VIN pin input range for eg. LM5185 can support from 4.5V to 100V which matches our requirement, gate drive strength, etc.

    This controller is meant for flyback operation and has only one Gate drive pin.  In order to drive half bridge, we will need two signals HI and LI (2 LM5185).

    Bases on what topology the customer is planning to use, we can select the controller from wide range of TI portfolio.

    To choose device LMG2100, we will have to evaluate both the devices based on power levels, form factor, Rdson, etc. to decide which one will give better performance?

    I hope this resolves your query.

    Thanks & Regards,

    Ruchika