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LM61480: Maximum output current at 2.2Mhz

Luke Sakamoto
Intellectual 1555 points
Part Number: LM61480
Other Parts Discussed in Thread: LM61495

Hi team,

I would like to know if LM61480 or LM61495 can handle maximum continuous current of 8A on the EVM.

Thanks,

Luke

  • 0
    TI__Expert 3766 points

    Hi Luke,

    Thanks for your inquiry. If you can place your design parameters into this quickstart calculator spreadsheet, it can generate a sample schematic with the right current limit specifications for you. Let me know if you have any issues.

    Regards,

    Henry

    Calculator Tool - LM62460-Q1, LM61480-Q1, LM61495-Q1.xlsx

  • 0 in reply to Henry Kou
    TI__Intellectual 1555 points

    Hi Henry,
    Thanks for your reply.
    I took a look at the Excel sheet. I was able to configure Vin=24V, Vout=5V, Iout=1.2Mhz @1200kHz, 1500kHz & 2200kHz without an error with LM61480.
    However, I am suspicious because 2200kHz with 8A is a very aggressive value. (considering high switching loss.)

    Can you let me know if configurable on this Excel sheet means it can run on EVM in real life?

    Thanks,

    Luke

  • 0 in reply to Luke Sakamoto
    TI__Expert 3766 points

    Hi Luke,

    The main factors I would watch out for are the IC power loss section 9 in the calculator, and the thermal resistance, theta_JA of the power MOSFET. RDSon of the FET is dependent on temperature so depending on the operation, you may cause FETs to overheat and coheat the IC to enter into thermal runaway.

    I would carefully examine the operation of the MOSFET in the datasheet over temperature. You can also order an EVM and test as well, the excel sheet is just an estimate and the real results are dependent on the layout of the board.

    Regards,

    Henry

  • 0 in reply to Henry Kou
    TI__Intellectual 1555 points

    Hi Henry,

    Thank you for your reply.

    I understand that it consists of many factors including layout and ultimately has to be evaluated.

    However, i would like to have a grasp on this ic especially the emitting heat.

    Do you have the efficiency curve at a high switching frequency? I only see one with low Fsw in the datasheet.

    Thanks,

    Luke