WEBENCH® Tools/LM3481: Simulation with WEBENCH of a SEPIC circuit with an LM3481

user4451984

Part Number: LM3481

Tool/software: WEBENCH® Design Tools

Hello,

I have simulated a converter with WEBENCH, I have attached the simulation.

The inductor suggested is a DRQ127-3R3-R, datasheet report for the series configuration a max Irms = 5.23 A and Isatpeak=10.8A. looking the graphics for Lin (see below) it seems that the current can be higher than 5.23A.

Are my considerations wrong ? Can I use that inductor even if Vin=4V and Iout = 3A, as required in my simulation ?

Best regards

Riccardo

WBDesign17.pdf

over 5 years ago

0 Yinsong Cai1 over 5 years ago

TI__Expert 7450 points

Hi Riccardo,

Thanks for your interest in LM3481.

The Irms current rating is the current of 40degree C temperature increase. For example, if your ambient temperature is 25 C, the inductor would becomes 65 deg C theoretically, which should be fine.

That being said, if you have high ambient temperature or you want a better thermal condition for the inductor, you will need to find a better inductor. Please let me know if you have further questions.

Thanks,

Yinsong

0 user4451984 over 5 years ago in reply to Yinsong Cai1

Intellectual 850 points

Thanks a lot

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WEBENCH® Tools/LM3481: Simulation with WEBENCH of a SEPIC circuit with an LM3481