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high IR led power?

Discussion in 'LEDs and Optoelectronics' started by 24Volts, Mar 10, 2013.

  1. 24Volts

    24Volts

    164
    0
    Mar 21, 2010
    Hello,

    I would have a quick question about the TSAL6100 IR LED:

    http://www.vishay.com/docs/81009/tsal6100.pdf

    In the absolute maximum ratings section of the data sheet, it says that this led's forwards current is 100ma. But then it also says that the peak forwards current is 200ma.

    My question is, if I am pulsing this LED at 38Khz, can I go beyond the 100 ma maximum current. Like for example 150ma?

    And if not are there any LEDs with the same characteristics that can draw
    150ma....?

    Thanks for all help!
    24v
     
  2. hexreader

    hexreader

    105
    19
    Apr 21, 2011
    150mA pulsed at 38kHz is fine, as this gives an average current of 75mA.

    You need to be very careful that your LED is never left on though, otherwise you may drastically shorten its life. For instance, if you are using a microcontroller, make sure that a rest condition does not allow the LED to be on.

    Domestic IR remotes usually give a 25% or 33% duty cycle to the 38kHz transmit signal to improve battery life.

    I have seen IR LEDs that allow 1A peak current (forget what the steady current was). The more current that you can pulse through the LED the greater the range that you will acheive.

    Using two LEDs to get greater range is common too.
     
  3. 24Volts

    24Volts

    164
    0
    Mar 21, 2010
    you're warning has well been noted!

    thanks hexreader for your reply!

    24v
     
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