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LM62460: EXCEL Calculator Tool

Stephan Schade
Prodigy 150 points
Part Number: LM62460
Other Parts Discussed in Thread: LM61460

Hello Community.

is there already a calculator tool for EXCEL for the part LM62460?

  • +1
    TI__Guru 50120 points

    Hi Stephan,

    The calculator tool is currently in the works for this device. This device is expected to be released by April 2021 and will be accompanied by the calculator tool.

    In the mean time, can you let me know your power application?

    I have help provide you the appropriate components following datasheet recommendations.

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    Prodigy 150 points 
    Hi Jimmy
    
I want to build a switching regulator with a variable output voltage (through a variable resistor FBB). 
    I simulated various output voltages in Webbench, initially without changing the proposed circuit. 
    At 14V the power loss in the Mosfet suddenly becomes too great. only from 15.08V upwards is this acceptable again. 
    I cannot understand the sudden jump between 15.07V and 15.08V in the power loss.

    My Settings: Vin-max 25V, Vin-nom 24V, Vi-nmin 23V
    Iout-max 5A, Iout-nom 3A, Temp(enviroment) 40°C
    Output voltage in steps from 22V to 10V.


    Edit:
    the thread was incorrectly marked as solved. 
    It also contains the question of how the power loss or the jump at 15.07V and 15.08V comes about.


  • 0 in reply to Stephan Schade
    TI__Guru 50120 points

    Hi Stephan,

    It looks like your application might be similar to a USB C use case. I'll refer you to a schematic for something similar on the LM61460. 

    This schematic can also be applied to the LM62460 device as well. 

    Note that the inductor and output capacitors were picked for the worse-case condition (lower output voltage). In this case you should pick an inductor to accommodate the 10V output rail. Also I'd recommend operating at a lower switching frequency so as to have better efficiency and thermal performance. 

    In this case I would design the circuit to accommodate worse-case of 25Vin|10Vout|6A|400kHz. 

    Regards,

    Jimmy 

  • 0 in reply to Jimmy Hua
    Prodigy 150 points

    Hi Jimmy

    Thank you for your response. I had already considered the LM61460 but it is currently not available.
    Unfortunately, my question has not yet been answered. Why is there this jump in the power loss of the Mosfets, 
    or why is it so big. Maybe this is just a bug in Webbench or there is another effect that I missed.
  • 0 in reply to Stephan Schade
    TI__Guru 50120 points

    Hi Stephan,

    I believe this is a bug and have pointed this out to the previous engineer and will contact the Webench folks to get better clarity on this.

    The trend should be that power dissipation is worse at lower duty cycle (high Vin, low Vout) because of the drop in efficiency as seen in the datasheet efficiency curves. 

    As the LM61460 is capable of being used in USB Type C applications, the LM62460 should be no different. 

    Regards,

    Jimmy