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TLC59108 supply current

Burkhard Merg
Prodigy 50 points
Other Parts Discussed in Thread: TLC59108

Hi all,

the datasheet of the TLC59108 states a supply current ICC:  max. 17mA @5.5V if all outputs are OFF and Rext is open. What is the reason for this huge current consumption? Are there typical values available for ICC?

Best Regards

Burkhard

  • 0
    TI__Expert 3460 points

    Hi Burkhard,

    The max value is listed at 17mA to account for the full range of temperature. The typical values below 85C will be lower and depend on the operating temperature, REXT value,  and VCC level chosen.

  • 0 in reply to Harry Kennedy1
    Prodigy 50 points
    Hi Harry,
    thanks for your reply but it didn't answer my questions. Again, why does the device consume up to 17mA if no LED is active?
  • 0 in reply to Burkhard Merg
    TI__Expert 3460 points
    Burkhard,

    Looking at the functional block diagram, there are different blocks that consume current for different reasons such as biasing the output drivers for a faster response. Over process and temperature, the current consumed may change. Our datasheet max ensures that under worse case scenarios, the current will be less than or equal to 17mA.

    The important thing is to look at your application and the conditions it will face. For example, looking at a single unit in the lab shows current closer to 6mA with no REXT at room temperature. Keep in mind that this is one unit data. I hope this adds a little more clarity.