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Interfacing an LCD screen

Discussion in 'General Electronics Discussion' started by hosS, Apr 29, 2013.

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  1. hosS


    Apr 29, 2013

    I am trying to supply an LCD screen wich consume a little more than 100mA (LCD 100mA, Touchscreen controller 2.6mA, Backlight controller 1.7mA).
    I am using LM317T regulator and it is connected as follow to generate 3.3V.
    My question is should I use a resistor to limit the current on the VCC pin of the screen?
    Any advises to improve the supply block will be welcome. :)

    Attached Files:

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    LM317T is the TO-220 package, It's fine for >100mA. If it gets too hot, add a heatsink. However, with an input voltage of 5V it's neither going to get hot, nor produce a reliable 3.3V (the overhead is just too close to the lower limit)

    You probably need a low dropout regulator unless the 3.3V rail is non-critical.
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