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Original question:

TPS61196: Multi-Chip Operation In Parallel

TPS61196: TPS61196

Hugo Liu
Genius 5095 points
Part Number: TPS61196

Hi Sir,

Our customer have two panel survey the LED Driver solution,

We are promotion TPS61196, But Panel B If=480mA over spec.

if Panel A use TPS61196, is this solution OK?

Could you please share Panel B TI suggest solution for me? 

Hugo

Panel A
Item Symbol Min Typ Max Unit Condition
Forward voltage Vf 50.4 54.9 59.4 V If=240mA
Luminance LV 　 215 　 cd/㎡
Number of LED - 72
18 series 4 parallel		 Piece -
Connection mode p Series and parallel  - -
Panel B
Item Symbol Min Typ Max Unit Condition
Forward voltage Vf 28 31 34 V If=480mA
Luminance LV 900 1000 　 cd/㎡
Number of LED - 60
10 series 6 parallel		 Piece -
Connection mode p Series and parallel  - -

 

  • 0
    TI__Mastermind 22745 points

    Hi Hugo,

         For TPS61196, it can't support 480mA per channel since you have six channels. But you can use two TPS61196 pieces and combine three IFB channels together to support 480mA.

    Regards

    Sean

  • 0 in reply to Sean Zhou
    Genius 5095 points

    Hi Sean,

    May I Double Check With you, the schematic similar as below right?

    or Do you have ref design can be share to me?

  • 0 in reply to Hugo Liu
    TI__Mastermind 22745 points

    Hi Hugo,

         Please refer to the datasheet for your design and you need to add 10Mohm resistors for each used channel.

    Regards

    Sean

  • 0 in reply to Sean Zhou
    Genius 5095 points

    Hi Sean,

    the Customer panel SPEC as below,  the A & K is on panel connector.

    we are see the TI demo board ref design, for this application only need one channel to support this panel ? right?

    other channel is IFB pin 27k to GND to disable the function right ?

    How about the PWM pin setting? short together or floating?

    Panel A
    Item Symbol Min Typ Max Unit Condition
    Forward voltage Vf 50.4 54.9 59.4 V If=240mA
    Luminance LV 　 215 　 cd/㎡
    Number of LED - 72
    18 series 4 parallel    		 Piece -
    Connection mode p Series and parallel  - -

  • 0 in reply to Hugo Liu
    TI__Mastermind 22745 points

    Hi Sir,

         For this SPEC, I suggest using two channels together to drive 240mA, each channel support 120mA. And you need to connect the PWM1/2 together to give the same PWM signal.

    Regards

    Sean

  • 0 in reply to Sean Zhou
    Genius 5095 points

    Hi Sean,

    Thank you very much

    Hugo