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TPS560430: Inverting buck boost webench simulation

Taketo Sato
Genius 10295 points
Part Number: TPS560430

Hello team,

Can we simulate TPS560430 with Webench for inverting buck boost use case(12Vin, -12Vout, 0.01A Iout)?

I wanted to simulate especially power dissipation.

If Webench doesnt support TPS560430 inverting buck boost, I would appreciate if you could let me know an app note describes calculation of power dissipation with inverting buck boost.

Or, can we possibly simulate the dissipation on Webench if we set 24Vin, 12Vout and 0.02A Iout condition instead of 12Vin, -12Vout, 0.01A Iout?

Best regards

  • 0
    TI__Genius 10715 points

    Hello Taketo,

    Unfortunately, this device is not available for simulation in Webench yet, but I have provided an application note on IBB below:

    https://www.ti.com/lit/an/snva856a/snva856a.pdf

    According to the app. note it is difficult to estimate the power dissipation of the IC before the design is built and tested.

    An alternative would be to modify an EVM and take efficiency measurements in order to get the best idea of power dissipation.

    Regards,

    Harrison Overturf

  • 0 in reply to Harrison Overturf
    TI__Genius 10295 points

    Hello Harrison-san,

    Thank you for your comment.

    I understand Webench doesnt support the device's IBB.

    >According to the app. note it is difficult to estimate the power dissipation of the IC before the design is built and tested.

    Cannot Webench simulate dissipation with 24Vin, 12Vout, 0.02A condition?

    I thought 12Vin, -12Vout, 0.01A Iout IBB condition is similar to normal buck 24Vin, 12Vout, 0.02A condition and may be possible to simulate dissipation.

    Best regards,

  • 0 in reply to Taketo Sato
    TI__Genius 10715 points

    Hello Taketo-san,

    Yes you are correct, you can use Webench to simulate dissipation of a normal buck with the condition 24Vin, 12Vout, 0.02A as an approximation for the dissipation of IBB at 12Vin, -12Vout, 0.01A.

    Another way to quickly check is to take a look at Figure 3 in the datasheet and find the efficiency for the case of 24Vin, 12Vout, 0.02A (looks like ~85%).

    Hope this helps!

    Regards,

    Harrison Overturf