How to connect NSI45030T1G in led circuit

Discussion in 'General Electronics Chat' started by sunday01, Dec 18, 2014.

  1. sunday01

    Thread Starter New Member

    Dec 18, 2014
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    0
    Dear all,

    Would you please help me with this circuit. I have a voltage source vary from 9V to 18V. I am using Osram LWE6SG .
    Is it enough for turn on the LED?
    If the circuit is not correct, would you please give me a reference (just simple because my PCB is very small 2x3mm).
    I would very much appreciate any help or guidance you are able to give me.

    Thanks,
    Sunday
    osram_led.jpg
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Well your circuit looks good but have you checked a power dissipation in current source?
    Also are you gonna to use a single LED only?
     
  3. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Welcome to the forum!
    So how are you going to mount D3? Its maximum dimension is 3.86mm and it requires 100mm^2 of 1-oz copper pad to handle 208mW max. With a 9V battery D3 will be dissipating ~180mW, which is uncomfortably close to the limit. With an 18V battery D3 will probably fry.
     
    sunday01 and #12 like this.
  4. sunday01

    Thread Starter New Member

    Dec 18, 2014
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    Yes, I use single LED only.

    I need a simple constant current source that provides ~30mA current from a 9-18V source, because this source is come from the other design that I cannot approach.
    Would you please refer me another circuit that can drive this led?

    Thank you so much for your help.
     
  5. ronv

    AAC Fanatic!

    Nov 12, 2008
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    sunday01 likes this.
  6. sunday01

    Thread Starter New Member

    Dec 18, 2014
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    I"m sorry, my PCB is 2x3 cm.
     
  7. ronv

    AAC Fanatic!

    Nov 12, 2008
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    Then the circuit above should work. :=)
     
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