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AMS1117 getting really HOT

  • mrmuzzio Monday, August 27, 2018 11:07 PM Reply

    Hi! I'm using this adapter with a 12v source to power up an ESP-01 (with 3.3v output) and an Arduino Pro mini (with 5v output). After about a minute the AMS1117 5.0 gets really hot, according to my infrared thermometer it gets up to 75 Celcius. It's this normal ? 


    Thanks!


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  • matrix-neo Moderator Tuesday, August 28, 2018 9:40 AM Reply

    don't worry, the AMS1117 can operate up to 125 Celcius, if you really want to lower it apply a heatsink

    Resistance is futile-give in to DX gadget craving!
    also a voluntary mod-be nice please!
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  • desolder Top 10 Forum Poster Wednesday, August 29, 2018 12:15 AM Reply

    Good grief. The AMS1117 isn't a "step down" converter. It's a simple
    linear regulator that burns off the excess voltage as heat. Since it's
    dropping 12V down to 3.3V, it's wasting 72.5% of the energy. For light
    loads this is OK. But if your Arduino Pro mini and ESP-01 draw their
    maximum current (200mA and 300mA according to the datasheets), the
    AMS1117 has to dissipate 4.35W. That's a LOT of power for a tiny
    package. When the two devices reach peak draw, most likely the AMS1117
    will overheat and shut off.


    You should swap out this module for a more efficient switching power supply.


    [edit] wow that's bizzare... why is the word wrapping happening at the halfway point?


    What's up with the scrubbed LED driver IC markings?
    What are they trying to hide?

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    post edited by desolder on 8/29/2018 at 12:18 AM
  • mrmuzzio Wednesday, August 29, 2018 4:38 AM Reply

    Thank you both for your replies, I added a heatsink like @matrix-neo has recommended to the AMS1117-5 wich was the one getting hotter. Now it runs at 50 Celsius.


    There is another AMS1117-3 in this board wich is the one used to provide 3.3 v to the ESP01 from the 5v line. This one is nearly at room temperature.


    I'm going to look for a more efficient switching power supply like @desolder suggested. Do you know of any in Dx.com ?


    Again,thank you both for taking the time to answer!


    (don't know why the word wrapping is doing that!)


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  • desolder Top 10 Forum Poster Wednesday, August 29, 2018 5:28 AM Reply

    You can buy two of sku.379396 and use the adjustment pot to set one to 5V and the other to 3.3V. Or you can get sku.439029 and sku.439030

    What's up with the scrubbed LED driver IC markings?
    What are they trying to hide?

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  • sheepish Top 10 Forum Poster Wednesday, August 29, 2018 9:40 AM Reply

    Since it's
    dropping 12V down to 3.3V, it's wasting 72.5% of the energy.


    Yeow. Toasty.


    What would you recommend for a mobile (ie, small) 5V 4A regulator?

    Remembering 30 years.
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  • mrmuzzio Wednesday, August 29, 2018 9:18 PM Reply

    Thanks @desolder I'll get one of these! 


    @sheepish In the board you have two AMS1117, I think one is for the 12v->5v convertion and another for 5v->3.3v. The one that gets really hot is the first one (12v->5v). I'll added a heatsink for now, until I can get one of the switching converters.

    Thank you for your reply !


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