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LMG2100R044: Compatibility with Analog PWM controller

Steve Widener
Genius 11010 points
Part Number: LMG2100R044
Other Parts Discussed in Thread: LM5145, LM5148, PMP31349

Tool/software:

Can  this device be used in a sync buck application with the LM5145?

I see a reference design using the LM5148 (PMP31349) and wondered if the LM5145 was also compatible.

Specs: 36V -> 60Vin, 32V out 11.5A, 26A start-up surge current. Freq > 120kHz,

Also -do we have any loss calculation tools for the GaN Power stage?

  • 0
    TI__Expert 4520 points

    Hello Steve,

    Currently for GaN loss calculators featuring LMG2100, we only have our Matlab LLC calculator available. However, a simplified calculation is explained in section 8.2.2.4 of the LMG2100 datasheet.

    For compatibility with LM buck controllers, I will pass off to our buck controller team who can help give suggestions here.

    Thanks,
    Zach Soviero

  • 0 in reply to Zachary Soviero
    TI__Genius 11995 points

    Hi Steve, 

    Please see my comments:

    Any reason why the customer prefers the LM5145 over LM5148? LM5148 is a current mode control controller while LM5145 is a voltage mode controller. Current mode control in most cases is a better topology over Voltage mode. With the PMP31349 - it will be easier to implement also since it is a tested and proven design. 


    Having said that - LM5145 can work with GaN - HOWEVER - the gate drive voltage for LM5145 is 7.5V (which is higher than LM5148). You need to ensure that the GaN driver is rated accordingly. You may have to use level shifters (which will add cost as well as propagation delay). 

    Thanks,

    Best Regards,

    Taru