WEBENCH® Tools/TPS56121: Different simulation results of TPS56121

takahiko yokota

Mastermind 7135 points

Part Number: TPS56121

Tool/software: WEBENCH® Design Tools

I simulated TPS56121 the following condition.

But the results about Vp-p was different(1st time is 4.881mV, 2nd time is 7.454mV).

Could you tell this reason?

Vin_min=Vin_max=13V

Vout=10.5V

Iout=8A

Fsw=500kHz

Ta=90℃

TPS56121(2nd).pdf 5518.TPS56121(2nd).pdf

Best regards,

Yokota

over 8 years ago

0 JohnTucker over 8 years ago

TI__Guru**** 191445 points

Moving this to the Webench forum. Also, both files are the same. Can you post your first attempt?

0 Flora Carreto over 8 years ago in reply to JohnTucker

TI__Intellectual 2510 points

Yokota-san,

Do see different TPS561211 Voutpp results after clicking "recalculate" button or did you create 2 designs under the same conditions at different times?

If you tried the first thing, I was unable to reproduce the issue. But if it is about the second possibility, when did you create the first design?

Best regards,

Flora

0 takahiko yokota over 8 years ago in reply to Flora Carreto

Mastermind 7135 points

Hi Flora-san

Thank you for the reply.

I created 2 designs under the same conditions at different times.

I created first design at July 21th, 2017.

Best regards,

Yokota

0 Flora Carreto over 8 years ago in reply to takahiko yokota

TI__Intellectual 2510 points

Yokota-san,

Thanks for providing more information about your design. We recently made some updates to the way we calculate the capacitor derated value in the tool. The Vout-pp that you see today is different from the July 21st design due to this reason. Please use the latest design opvals for your reference.

Best regards,

Flora

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WEBENCH® Tools/TPS56121: Different simulation results of TPS56121