This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

  • TI Thinks Resolved

TLC5916: Any problem with running the TLC5916/17 with no Rext?

Prodigy 40 points

Replies: 4

Views: 78

Part Number: TLC5916

I know!  Why the heck would anyone want to do that?!?  But, what if you wanted two brightness levels--levels that extended beyond the dynamic range of the "256-Step Programmable Global Current Gain" feature?

Well, you might switch Rext in and out of circuit.  The datasheet seems to imply that both states are sanctioned: Tables 7.5 and 7.6 include an IDD case where Rext = "Open"

So, is running the TLC5916/17 device without an Rext connected, in fact, an approved mode? 

  • You can leave it open and there'll be no output current for this condition.

    Thanks and best regards,

    Kenneth

  • In reply to Kenneth Du:

    And, does TI authorize this configuration for a production design? 

  • In reply to Kenneth Du:

    The question wasn't whether or not current would flow -- the question was if this is an approved state. The datasheet only seems to imply that it is, but I want a definitive statement, from TI, that it is.
  • In reply to Steve Lawson:

    You can run it without Rext or switch one Rext to another during running.

    Thanks and best regards,

    Kenneth

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.