WEBENCH® Tools/LM3478: Boost convertor

Prodigy 130 points

Replies: 6

Views: 26

Part Number: LM3478

Tool/software: WEBENCH® Design Tools

I changed two parts, because space requirements. These parts are:

D1 = SB20150TR to TSP20U60S S1G

and

M1 = CSD17579Q3A to CSD17579Q56

Can you tell me what in impact is on the result

Best Regards,

Piet

 

6 Replies

  • Hi Piet,

    Thank you for designing with the LM3478.  What is the topology do you use?

    Thanks,

    Youhao Xi, Applications Engineering?

  • In reply to Youhao Xi:

    Dear YouHao,

    I use boost topology

    • Input 12VDC/120Watt
    • Output 16VDC/7A

    Best Regards,

    Piet

  • In reply to Piet Vaes:

    Dear YouHao,

    I forgot to you to inform you about the load. The load is an Peltier element (TEC1-12706)

    Best Regards,

    Piet

  • In reply to Piet Vaes:

    Hello Piet,

    I am sorry, but I cannot find the circuit you are referring to. Is it a specific Webench design? If yes, please share.

    For the diode and transistor, please check if the smaller devices are able to handle the power dissipation. As you mention they are smaller, they might have a higher junction to ambient thermal resistance.

    Best regards,
    Brigitte

    For more information on buck-boost devices have a look at www.ti.com/buckboost

  • In reply to Brigitte:

    Dear Brigitte,

    The name of the design is Design : 76 LM3478MMX/NOPB

    Best Regards,

    Piet

    WBDesign76 (16V-7A).pdf

  • In reply to Piet Vaes:

    Hello Piet,

    Best would be if you open the Webench design and exchange these components there as the tool calculates if the power dissipation is feasible or not.

    BTW, the new transistor is CSD17579Q5A, right? I do not expect big influence by exchanging this transistor in the design.

    With the new diode you should get a somewhat increased efficiency and therefore reduced board temperature.

    Best regards,
    Brigitte

    For more information on buck-boost devices have a look at www.ti.com/buckboost