LDD-600H

Discussion in 'General Electronics Chat' started by RodneyB, Dec 8, 2014.

  1. RodneyB

    Thread Starter Active Member

    Apr 28, 2012
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    I have the Above LED driver driving a 10 Watt Green LED . It is getting extremely hot. I have looked for shorts in the tracks and there is nothing. I have several of these in parallel from a 12 Volt supply and only this one is getting HOT looking for some advice.

    http://www.mantech.co.za/Stock.aspx?Query=Ldd-600Hand datasheet found here
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Have you broken the +load wire and inserted an ammeter?
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    What are the specifications of the used led?
    When I calculate the 10 Watts / 600 mA , I get 16.6 Volts.
    The driver is a step-down converter, so the input voltage should be higher than the mentioned 12 Volts.

    Bertus
     
  4. RodneyB

    Thread Starter Active Member

    Apr 28, 2012
    633
    13
    The Supply data sheet says VF 7,2 volts If 1050mA
     
  5. RodneyB

    Thread Starter Active Member

    Apr 28, 2012
    633
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    I will test the current tomorrow
     
  6. bertus

    Administrator

    Apr 5, 2008
    15,649
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    Hello,

    When the led has a Vf of 7.2 Volts at 1050 mA , I get about 7.5 Watts.
    At 600 mA you will have a lower Vf and much less power.
    I think you will have 3.5 - 4 Watts.

    Bertus
     
  7. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,771
    971
    Yes in general the 10W comes from max Vf and max current and they are constantly rounding up and even down with those specs..
    Most of the 10W are 9-12Vf @900mA
    The 6-7.2V @1050mA tend to be IR LEDs.
     
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