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TLC59025 minimum current sink

1351769
Intellectual 275 points
Other Parts Discussed in Thread: TLC59025

Hello,

I have a customer interested in the TLC59025 LED driver who wanted to know what is value Rext should be to get a 3mA output on each LED.  Using the equation provided on page 13 of the datasheet, it would be 6.251Kohms. Is this correct or should Rext be left open to get the minimum output current? The customer is also considering a drop in part from LINSN (under NDA with customer). If you are aware of this part, do you know any advantages the TLC59025 may have?

Thanks,

Ali Kozak

Avnet FAE

 

 

 

  • 0
    TI__Mastermind 36110 points

    The minimum specified current of 3mA is a minimum current to guarantee stability.  You can get less current with larger resistor values, but this is not recommended.  You must use a resistor (6.251 kohm) on the R-EXT pin in order to set the current to 3mA.

     

    I am not aware of a pin to pin replacement and can not comment on the quality or performance of the LINSN IC.  As you are already aware, TI is a very large company with extremely high quality products that we stand behind.  We have very competitive pricing and a very extensive technical support structure for our produccts.