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SX48/52 protoboard stability — Parallax Forums

SX48/52 protoboard stability

RsadeikaRsadeika Posts: 3,840
edited 2008-01-11 16:49 in General Discussion
I decided to do some testing on a bad protoboard that I have. In my project I want to tap into·a battery source that supplies·unregulated 17VDC power @ .5 amp, and when on a charger it will be as high as 22VDC. I took some heat measurements, in a test run,·of the power supply, and the bad SX52 chip, the digital thermometer faulted at 158 degrees F. Now, the question is, if I were to use a good protoboard, how long would the protoboard be able to function, especially the chip itself. I could probably beef up the power supply, and the chip with some heatsinks, to reduce the heat around those areas. Has anybody done anything like this?

Ray

Comments

  • BeanBean Posts: 8,129
    edited 2008-01-11 13:43
    Sound like a good case for a switching power supply.
    What voltage and current do you need from the supply ?

    Bean.

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  • RobotWorkshopRobotWorkshop Posts: 2,307
    edited 2008-01-11 14:39
    Hello Ray,

    I'm not entirely clear on how you are connecting everything to your protoboard. Are you just going to connect your 17V-22V power supply directly tot he onboard voltage regulator on the protoboard? What was heating up so hot? I can the the voltage regulator getting hot but the SX chip shouldn't get any hotter than normal unless you are trying to supply that chip directly and the regulator isn't doing it's job.

    You mentioned that you are testing a bad board. Could it be that the SX chip or regulator is shorted on it and contributing to the excess heat??

    Robert
  • RsadeikaRsadeika Posts: 3,840
    edited 2008-01-11 16:49
    I never thought in terms of a short, after checking the bad protoboard, there were no shorts. After I removed the SX52 chip from the protoboard, the extreme heat condition went away. The strange part is, when I had a 9 vdc source plugged into the protoboard, it·never heated up like that, it is only after I plugged in the 17 vdc source that the heat showed up. I also decided to take a chance, and plugged the 17 vdc source into a new protoboard, no excesive·heat problem. I guess that the SX52 chip itself can get shorted, but how that happened, I do not have the slightest idea. I think the mystery is solved.

    Ray
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