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Decision between tlc59116 and tlc59116f in respect to overcurrent due to dying LEDs.

gerd wolfinger
Prodigy 60 points
Other Parts Discussed in Thread: TLC59116, TLC59116F

Dear TI team,

I am going to develop a product which must not show dangerous behaviour (=burning due to high current consumption) in case when LEDs reaches end of life. At the end of LEDs life there is a 50/50% risk that LEDs shortening the circuit.

The constant current version tlc59116 would be the best choice if there wouldn't be the heating disadvantage during normal operation. I know there are a lot of things you can do against it but at the end the tlc59116f is cooler due to design.

What happens, most likely, if the current of one ore more channel(s) of a tlc59116f increases to 500mA due to short circuit of a dying LED ?

Does it toogle betweem "Overtemperature-Off" and "On" state or is there a possibility that it burns down or simply loses this channel without losing all other channels ?

Thank you for your experienced answer in advance

regards

Gerd

  • 0
    Prodigy 60 points

    Dear TI team,

    That question is ment seriously.

    I have to decide whether the current regulated version tlc95116 is the more adequate selection neverthless it gets hotter during normal operation.

    So i simply need to know what i have to expect if tlc59116f is driven with app.0.5A which is to be expected if LEDs can die. I use 5LEDs with about Uf=2,7V each and 33Ohm in series on Vcc=15V.

    Operating current: 45mA   [15V-(5V*2,7Uf)] / 33Ohm=0,045A.

    If one LED dies and shortens the circuit we get: [15V-(5V*2,7Uf)] / 33Ohm=0,127A which is already above the max. current of the driver.

    Other LEDs will follow........and what can we expect.

    Does the tlc59116f die silently or is there a burning down risk ?

    Regards

    Gerd