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WEBENCH® Tools/LM5117: 12V to 3.6V converter, 6A for charger a lithium battery

Pedro DA CUNHA
Prodigy 20 points
Part Number: LM5117

Tool/software: WEBENCH® Design Tools

Hello, 

I designed a prototype based on the LM5117 to charge a lithium battery, based on the results obtained with the WeBench tool.

The input voltage is 12V, the maximum desired output voltage of 3.6V knowing that the output range can vary from 2.8V to 3.6V.
The problem with my protype is when Vout is less than 3.3V, the output current cannot stabilize, only peaks over a very short time.

Ideally, I would like to design a charger which delivers a stable current of around 6A for an output voltage ranging from 2.8V to 3.4V, then decrease the current to 0A when Vout is equal to 3.6V.

Any proposal will be welcome.
Thank you.

Cordially, 

Pedro

WBDesign.pdf

  • 0
    TI__Expert 4555 points

    Hello Pedro,

    Help me understand the issue here. 

    Are you changing the VOUT dynamically using variable feedback resistor, potentiometer? Are you using TI EVM or custom EVM, If you are using custom EVM, can you please try your experiment on TI EVM first. 

    And can you share the waveforms of SW, Inductor Current, SW-Boot, Vout.

    Best Regards,

    Ankit Gupta 

  • 0 in reply to Ankit Gupta95
    TI__Expert 4555 points

    Hello Pedro,

    It's been a while we had any update on this. I am closing this thread so that TI won't monitor this thread any longer. Thanks!

    Best Regards,

    Ankit Gupta