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TI Home » TI E2E Community » Support Forums » Power Management » SIMPLE SWITCHER® » SIMPLE SWITCHER® - Forum » Is that workable to do LM3478 3.3V input to 5V2A vout?
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Is that workable to do LM3478 3.3V input to 5V2A vout?

Is that workable to do LM3478 3.3V input to 5V2A vout?

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ShihChin Lo
Posted by ShihChin Lo
on Dec 27 2012 01:54 AM
Prodigy70 points

Dear sir,

  We test LM3478 EVM board & try to change Vout to 5V2A but can't work. We use both datasheet page2 circult & webench circult  but result is the same.

So is that workable? Or what should we have to know about LM3478 if we need to use on 3.3 input?  Like Vgs threshold or something?

The fail symptom is before 5V 0.2A, sw node is normally but over 0.2A sw node will start jitter & unstable... Output ripple will become larger.

Boost DC/DC regulator
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  • Akshay Mehta
    Posted by Akshay Mehta
    on Dec 28 2012 15:44 PM
    Expert4105 points

    Hello Shih-Chin,

    Please send us your design schematic with the actual part numbers and values that you are currently using on the board. We could take a look at it and let you know. 

    Regards,
    Akshay 

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  • ShihChin Lo
    Posted by ShihChin Lo
    on Jan 01 2013 20:17 PM
    Prodigy70 points

     

     

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  • Akshay Mehta
    Posted by Akshay Mehta
    on Jan 02 2013 12:49 PM
    Expert4105 points

    Hello,

    I am not sure if you were trying to upload some attachments or not. But your post is empty. You might want to try again.

    Regards,
    Akshay 

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