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TPS546D24A: Power Dissipation Calculation

Santhana Krishnan T L
Prodigy 40 points
Part Number: TPS546D24A

Tool/software:

Hi Team,

I am using TPS546D24A in my design & below are the details.

Vin = 12V (Nom)

Vout = 3.32V (Nom)

Iout = 24A (Max) (per Phase)

No. of Phase: 4

Inductor: 0.56uH (XAL1030-561)

Switching Frequency: 550KHz

1. I would like to calculate the power dissipation of this device. Is there any tool/excel available to calculate the Power dissipation of this device? I see some of the information not available to calculate the MOSFET losses.

2. Could you please help to get the exact efficiency detail of the device for above configuration? 

3. As per datasheet, both recommended & absolute junction temperature of the device specified as 150°C. In general, recommended would be lesser than absolute max spec. Could you please reconfirm, the recommended specification of junction temperature?

-Regards,

Santhana Krishnan T L

  • 0
    TI__Guru 56985 points
    Santhana Krishnan T L said:
    1. I would like to calculate the power dissipation of this device. Is there any tool/excel available to calculate the Power dissipation of this device? I see some of the information not available to calculate the MOSFET losses.

    TI's WeBench calculator tool includes an efficiency and device power dissipation estimator.

    Santhana Krishnan T L said:
    2. Could you please help to get the exact efficiency detail of the device for above configuration? 

    Since final efficiency depends on a range of external factors including layout and trace losses, we can't provide an "exact efficiency detail, but the WeBench tool can provide a good estimation based on the trace losses from the TPS546D24AEVM PCB design

    Santhana Krishnan T L said:
    3. As per datasheet, both recommended & absolute junction temperature of the device specified as 150°C. In general, recommended would be lesser than absolute max spec. Could you please reconfirm, the recommended specification of junction temperature?

    The recommended operating junction temperature is -40C to +150C.  The electrical parameters in the electrical characterization table are specified over that operating temperature range unless otherwise noted.

    Operating the device with junction temperatures in excess of 150C may degrade the device's performance and reliability, so that is also the absolute maximum die temperature range.