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TPS548D22: the detail of IC Pd on WEBECH

Part Number: TPS548D22

Hi

I simulated the power consumption (IC Pd) by WEBENCH.

I got that total number on WEBENCH result.

However I would like to know the detail of the power loss. (How much is the switching loss and conduction loss and etc..?)

How can we know the detail? If there is any way to get the detail on WEBENCH , please advice me.

Best Regards,

Koji Hamamoto

 

 

  • Hello Koji,

    With the small duty cycle such as 12Vin/1Vout, you can estimate the conduction loss from the lower MOSFET. Then, the switching loss can be easily calculate from the IC Pd number. The lower MOSFET loss is mainly due to the conduction since the switching loss is almost zero. The upper FET loss is mainly due to the switching loss since the conduction is small with small on-time. Please see this link for calculation details: http://www.ti.com/lit/an/slva390/slva390.pdf

    Kit

  • Hi Kit,

    I am sorry for the delay in my response.

    I understood. We already calculated with the above way but it does not match our calculation result.
    We understood the how we can calculate the efficiency but we can not confirm the detail of the WEBENCH result .
    Can we know that detail if it does not match with the our calculation.

    Best Regards,
    Koji Hamamoto
  • Hi Koji,
    Can you please share your data how you calculate or measure your data? The data from the webbench is calculated based upon your design specifications. Best practice, the efficiency data from the EVM is best information which includes the PCB loss.
    Kit