WEBENCH® Tools/LM3478: Boost convertor

Hi Piet,

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

Thanks,

Youhao Xi, Applications Engineering?

Dear YouHao,

I use boost topology

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

Best Regards,

Piet

Dear YouHao,

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

Best Regards,

Piet

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.

Dear Brigitte,

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

Best Regards,

Piet

WBDesign76 (16V-7A).pdf

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.