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TPS61196 Paralleling outputs

Ryan Binns
Prodigy 70 points
Other Parts Discussed in Thread: TPS61196

Does anyone know if the outputs of the TPS61196 can be paralleled to give higher current, ie. can we have 3 strings of 800mA instead of 6 strings of 400mA? I'm assuming that all we'd need to do is halve the string current setting.

  • 0
    TI__Prodigy 200 points

    Yes, you can parallel the outputs of the TPS61196 together to drive higher current.  You should make sure the corresponding PWM inputs are also paralleled together as well. (ie if you parallel IFB1 & IFB2 then make sure PWM1 and PWM2 receive the same input PWM signal)

    You are correct that if you want 800mA for your LED string and parallel two outputs together per string then you would configure the TPS61196 for 400mA per output.


    I'd like to point out that the TPS61196 is rated for 200mA continuous (100% duty) output current per output.  It can do up to 400mA per output when the duty cycle is lower.  At 400mA per output a duty cycle of 50% would result in the same average current (and power dissipation).  So ultimately the limiting factor is power dissipation and keeping the TPS61196 junction temperature below the 125degC max operating temperture.  This also heavily depends on your PCB design (amount of copper surface area), air flow and maximum ambient temperature.

  • 0 in reply to Jeremy Yaeger
    Prodigy 70 points

    Thanks Jeremy. I actually only need 3 strings of 240mA; 800mA was just an example.

    Ryan

  • 0 in reply to Ryan Binns
    TI__Prodigy 200 points

    Ryan,

    Great, then that should work well.

    Thanks again,

    Jeremy