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Thread: SSR vs TIP31

  1. #1
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    Default SSR vs TIP31

    I've been doing some re-thinking of my setup and have been reading up on TIP31 NPN transistors. I am thinking about using dumb RGB strips (12v2A) as lights, 12v adapter to provide power to the strips and Cat5e cable to send control signals to the transistors. This way I can use only a few extension cords to provide the 110VAC to the elements as opposed to a whole yard full of spaghetti.
    I should able to build a couple of small PCB's and mount them in Carlton A238 utility boxes.

    Any thoughts or suggestions?

    FYI: this setup will only be used on a simple on-off setup.... I am not doing any dimming or fades! So, plz no comments about TLC5940's or DMX/Renards

  2. #2
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    Default Re: SSR vs TIP31

    Don't forget heatsinks, as those parts are going to run hot with 2A of collector current. And you're going to need to give it a lot of drive in order to make sure that it is truly driven into saturation (if you don't, the power dissipation is going to go up).
    Phil

  3. #3
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    Default Re: SSR vs TIP31

    Good point. Thanks

  4. #4
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    Default Re: SSR vs TIP31

    I'd look into N channel FETs instead. Much lower dissipation...
    /mike

  5. #5
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    Default Re: SSR vs TIP31

    Yeah^

    Fets act on the voltage level and just see the high or low signal and dont need current running though them like a npn or pnp does.

    Theses links might be interesting to you

    heatsync
    http://www.taydaelectronics.com/heat...aluminium.html
    "Jack of all trades, master of none,

    Certainly better than a master of one"
    Projects:
    [URL]http://hackaday.io/project/1092-Raptor12-AC-light-controller[/URL]

    Videos
    [URL]http://www.youtube.com/user/KingOfKYA/videos?flow=grid&view=0[/URL]

  6. #6
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    Default Re: SSR vs TIP31

    Another option is a low cost, logic level, low resistance, n channel mosfet http://www.taydaelectronics.com/irlu...lu024npbf.html
    http://www.christmasinwarren.com

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  7. #7
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    Default Re: SSR vs TIP31

    Hi there. The irlz14n are good choice. Depends on whether you are using full length strips or not but these are rated at 10amps a piece.
    They are my choice in my build.
    Hope this helps

    Matt

  8. #8
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    Default Re: SSR vs TIP31

    I would not use the IRF730 for a 2A load. You would more than a 5V Vgs in order to guarantee that the part will pass 2A, and then the power dissipation of the transistor would be a bit higher than with other possible transistors. The part that masterful mentioned is a much better part for this application, although I don't know the relative prices.

    Other parts to consider are the FQPF13N06L or the FQPF20N06L, which are not too expensive and have good on-region characteristics (i.e. they don't require high Vgs values to attain low Vds values for the current levels in question).

    Edit - the part that jklingert mentioned is also a good part with decent prices at tayda.
    Last edited by P. Short; 07-28-2014 at 08:20 PM.
    Phil

  9. #9
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    Default Re: SSR vs TIP31

    My thought is to use an Arduino Uno in combination with 74HC595's. I would run a serial USB cable out to a box in the yard housing an ATX power supply and the Arduino. From there I run short lengths of wiring to the display pieces. Each piece contains a single 10ftRGB dumb strip. The strip's paperwork says it draws 2A, but I'm assuming that that would be with all LEDs on

  10. #10
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    Default SSR vs TIP31

    (cont,) so in actuality each TIP31 would only be drawing about 0.667A as it would only be controlling 1 channel of the strip
    Last edited by celtman123; 07-28-2014 at 09:24 PM. Reason: continuation

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