From: Isaac Marino Bavaresco <isaacbavaresco@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Sat, 29 Aug 2020 14:37:15 -0700
Subject: Re: [EE] High Side LCD Backlight Control
Thread-Topic: [EE] High Side LCD Backlight Control
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Implement a buck regulator with a P-Channel MOSFET, inductor, Schottky diod=
e and capacitor.
Use a PWM output of your MCU (without feedback) and limit de duty cycle in =
software.

Em 29 de agosto de 2020 17:42:55 BRT, Josh Koffman <joshybear@gmail.com> es=
creveu:
>Repost with topic tag - I am so ashamed...
>
>Hi all,
>
>I'm working on a small project that uses a graphic LCD. I'd like to be
>able to control the backlight (possibly PWM for brightness). On this
>module the backlight ground is tied to the module ground, so I can't
>switch the low side.
>
>The backlight runs at 3.3V and maxes out at about 50mA. A bit of extra
>capacity might be nice just in case I ever size up a bit on the
>screen.
>
>What would be a good way to handle this? Space will be a bit limited
>so fewer parts would be better, and this is a low volume thing so I'm
>happy to spend a bit more on a transistor if it means fewer external
>parts. 3.3V is definitely not my area of expertise when it comes to
>switching, so any help would be appreciated.
>
>Thank you!
>
>Josh
>--=20
>A common mistake that people make when trying to design something
>completely foolproof is to underestimate the ingenuity of complete
>fools.
>        -Douglas Adams
>--=20
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