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WEBENCH® Tools/LM5022: LM5022 SEPIC topology

K.Hamamoto
Guru 12155 points
Part Number: LM5022
Other Parts Discussed in Thread: TPS40210

Tool/software: WEBENCH® Design Tools

Hi,

We are considering LM5022 at SEPIC topology with the following conditions.

Vin=10V~36V, Vo=12V, Io=3A

At the beginning of the considering , we simulated at WEBENCH. However the inductor was larger than expected.(180uH)

https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=B8169160B99CC2C5

On the other hand, we tried another device such as TPS40210. The inductor was small.(15uH)

https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=FDE86F61BF93777A

Why is the indcutor different with LM5022 and TPS40210?


I understand the inductor is depended on the switching frequency.In the case of LM5022 , the freq is 100kHz. In the case of TPS4021, it was 370kHz.

(We tried to change the freq of LM5022. But it couldn't ) Why the value is so different between LM5022 and TPS40210? What kind of parameter or spec of the device is related ?

Best Regards,

Koji Hamamoto

  • 0
    TI__Guru* 78080 points

    Hi Hamamoto-san,

    Thank you for considering our products. The Webench model refers to a particular EVM or reference design board, and the model is validated against the reference board.  This may bring some limitations by the reference board in part selection.  However, although the two part create different designs, they both should work.

    Please note that Webench is a useful and friendly tool to help you with a good start.  Fine tuning the circuit for optimal performance and cost is recommended.

    Thanks,

    Youhao Xi,  Application Engineering

  • 0 in reply to Youhao Xi
    Guru 12155 points

    Hi Xi-san,

    I am sorry for the delay in my response.

    I understood.

    Regards,

    Koji Hamamoto