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TPS61196: Increase LED output current to 500mA by tying IFB pins together

Ryan Delfino
Prodigy 150 points
Part Number: TPS61196

Hi there,

I would like to increase the output current of the LED string.

Is it possible to do this with below connection ? Do you have any issues with it ?

Regards,

Ryan

  • 0
    TI__Mastermind 22745 points

    Hi Ryan,

         Yes, that ok. and for each channel of TPS61196, it can continuously output 200mA, so I would suggets to combine 3 channels together to driver 500mA.

    BR

    Sean

  • 0 in reply to Sean Zhou
    Prodigy 150 points

    Hi Sean,

    Thank you for your advice.

    Just to confirm, in my application we are sourcing current (from the diagram above).

    Based from below info from datasheet, it can supply a minimum of 400mA

    So in order to achieve, 500mA, we only need to combine two channels right?

    Regards,

    Ryan

  • 0 in reply to Ryan Delfino
    TI__Mastermind 22745 points

    Hi Ryan,

        No, thst for pulse current with 400mA, we only recommend for maximum 200mA for each channel so for 500mA, we recommend minimum 3 channels.

    BR

    Sean

  • 0 in reply to Sean Zhou
    Prodigy 150 points

    Hi Sean,

    I plan to drive 5 LED strings with each string containing 28 LEDs.

    The current for each string are as below:

    • LED String #1 = 310mA
    • LED String #2 = 310mA
    • LED String #3 = 400mA
    • LED String #4 = 310mA
    • LED String #5 = 310mA

    Given this requirements, please help confirm that using part TPS61196 is not suitable in our design.

    If yes, can you help advice another part that meets this requirement ?

    Regards,

    Ryan

  • 0 in reply to Ryan Delfino
    TI__Mastermind 22745 points

    Hi Ryan,

        I'm sorry that TPS61196 can't set the different full-scall current for each channel, and it is better not to set over 200mA for each channel, I would suggest with the solution with several TPS61196.

    BR

    Sean