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Ask an Expert Forum Is it worth trying to adjust this LED driver?
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Is it worth trying to adjust this LED driver?

Fred27
Fred27 over 2 years ago

I bought some cheap LED lights recently. They seem pretty good for the price (less that £10 at Screwfix) but for what I'm using them for a bit dimmer would be ideal. Anyway, I thought it would probably be reasonably easy to modify the driver circuit for lower current and as a bonus the LEDs would probably last longer too.

I expected perhaps a simple capacitive dropper at that price, but on opening it up I can see something a bit more complex. It has an SOIC-8 chip on there but the marking don't reveal much when I've searched.

ICNE2531AE
A10350AB
2130

The white soldermask makes it a surprisingly tricky to trace the circuit too. Any tips, or ideas on the IC?

image

Just to reassure you all, I am aware that even the "low voltage side" of this sort of cricuit is dangerous to touch is it's likely to not be isolated from the mains side. Any modification will be done with it disconnected and then stand back, power it on and see what happens! The LEDs on the other side are two banks of 7 LEDs wired in series, so I could always disconnect one bank and hope that it's a constant current driver that will automatically half the output voltage.

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Top Replies

  • ggabe
    ggabe over 2 years ago +3
    If your interest is to extend the life look at the temperature of the components. The most probable failure mode is the electrolytics going out, due to quality, undersizing and the entire assembly operating…
  • charlieo21
    charlieo21 over 2 years ago +3
    Here is the IC datasheet: GENERAL DESCRIPTION (sonix-ic.com) Basically, you need to change the resistor at pin CS (7). Vcs has a nominal voltage of 670mV. Apparently, the original design has a…
  • michaelkellett
    michaelkellett over 2 years ago +1
    Found this via Google and a bit of messing: http://en.chiplightic.com/detail-150.shtml Only the front page - couldn't see how to get more. Not sure if it gets you far enough ! MK
  • michaelkellett
    michaelkellett over 2 years ago

    Found this via Google and a bit of messing:

    http://en.chiplightic.com/detail-150.shtml

    Only the front page - couldn't see how to get more.

    Not sure if it gets you far enough !

    MK

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  • beacon_dave
    beacon_dave over 2 years ago

    The 'low tech' way might be to place some ND lighting film in front of the lamp to reduce the brightness, assuming you can do so without affecting ventilation.

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  • Fred27
    Fred27 over 2 years ago in reply to michaelkellett

    Thanks! I promise i did do a fair bit of Googling myself, but found nothing. Was there any secret Google-fu that you used?

    I should be able to do a continuity check and work out which resistors are involved in current regulation an change the values. If I accidentally double it rather than half it and blow the LEDs then I'm not going to stress about it.

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  • Fred27
    Fred27 over 2 years ago in reply to beacon_dave

    That is indeed a good solution, but I fancy trying some circuit modification.

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  • michaelkellett
    michaelkellett over 2 years ago in reply to Fred27

    I found a disti who's list mentioned Chiplight and then I found them.

    Pity they only show a bit of the data sheet.

    MK

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  • ggabe
    ggabe over 2 years ago

    If your interest is to extend the life look at the temperature of the components. The most probable failure mode is the electrolytics   going out, due to quality, undersizing and the entire assembly operating at high temperature. All the LED lights died under my watch did the same way - by the electrolytics, way before the LED flux dropped. The bad electrolytics can bring the rest of the bulb with them and blow out the LEDs, controller and diodes too. 

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  • charlieo21
    charlieo21 over 2 years ago

    Here is the IC datasheet: GENERAL DESCRIPTION (sonix-ic.com)

    Basically, you need to change the resistor at pin CS (7).

    image

    Vcs has a nominal voltage of 670mV.

    Apparently, the original design has a 18Ω resistor, so the Iout = 37.2mA

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  • Fred27
    Fred27 over 2 years ago in reply to ggabe

    My main interest is in dimming it a bit - and picking the most fun way to do it.

    I'm sure you're right about the electrolytic capacitor being the most common failure.

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  • Fred27
    Fred27 over 2 years ago in reply to charlieo21

    You guys are awesome at finding datasheets. R5 seems to be the one. I'll try replacing it with a higher value this weekend and see if that does the trick. 

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