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TPS61196: Can we connect two LED strings to one IFB pin?

Shinsuke Tanaka
Intellectual 520 points
Part Number: TPS61196

Dear Sirs or Madams,

Can we connect two LED strings to one IFB pin?

The purpose is to increase the LED current per one IFB pin so that the current is bigger than 50mA.

We plan to control the LCD panel whose LED current per one string is less than 50mA, namely 30mA or 40mA, 

and we are afraid that TPS61196 can NOT work normally under the condition that ILED is set to be less than 50mA.

So, we want to examine whether TPS61196 can be used for the above LCD panel by some contrivances.

Best regards,

Shinsuke Tanaka

  • 0
    TI__Mastermind 22745 points
    Hi Shinsuke,

    TPS61196 can output continuous 200mA per channel, so don't worry about the current, it can also be setted to less than 50mA per channel. If you need higher continuous current, you can connect IFBs together.

    regards
    Sean
  • 0 in reply to Sean Zhou
    Intellectual 520 points
    Dear Mr.Zhou
    I'm sorry for my delayed response.

    >If you need higher continuous current, you can connect IFBs together.
    It seems for me that you are talking about
    whether multiple IFB pins can be connected one LED string on which big current flows.
    But what I want to know is,
    can multiple LED strings be connected to one IFB pin?
    Could you please respond to this question?

    The reason why I ask the above is that I'm still wondering if
    TPS61196 can be used under the condition that LED current per one IFB pin is less than 50mA without any restrictionns because our discussions shown below URL has yet to be completed.
    e2e.ti.com/.../750728

    In case that TPS61196 can NOT be used under the above condition or can be used but there are some restrictions,
    the increasing current per one IFB pin by connecting multiple LED strings to one IFB pin
    may be possible countermeasure, so I want to know whether such connection is acceptable.

    I'm sorry to bother you repeatedly, but could you please resolve my question?

    Best regards,
    Shinsuke Tanaka
  • 0 in reply to Shinsuke Tanaka
    TI__Mastermind 22745 points
    Hi Shinsukem,
    yes, You can use one IFB channel to drive multi LEDS, but there is a problem about the current match may be not very good since you use one current sink to drive multi channels. If you don't have very strict demand on the match , it is ok for your application.
    Best regards
    Sean