TPS40210: Is the Equation 55 correct?

Yusuke Mukuno

Expert 7395 points

Part Number: TPS40210
Other Parts Discussed in Thread: LM5155

I have an question about TPS40210 Datasheet equation.

Is the Equation 55 correct?

The equation is from FET switching power loss.

FET current(Id) of Boost convertor is Vin +/- 1/2 x dIL.

I think, we should calculate by Iin instead of Iout. Is it correct?

If it is correct, In case of the boost rate is high, it has big impact for customer calculation. I hope datasheet correction.

Could you please check it?.

Muk

over 6 years ago

0 Richard Fu22 over 6 years ago

TI__Mastermind 31315 points

Hi Muk,

You are correct, you should use I_in instead of Iout for equation 55.

Thanks for the catch.

Additionally, is your customer aware of the LM5155? It is a next generation update for the TPS40210 and may be suitable for your customer's application. You can find the link here: http://www.ti.com/product/LM5155

Thanks,

Richard

0 Yusuke Mukuno over 6 years ago in reply to Richard Fu22

TI__Expert 7395 points

Richard-san,

Thank you very much for your support!

Muk

Power management

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TPS40210: Is the Equation 55 correct?