[sdiy] get 5V from 12V - DC-DC converter or 7805?
rburnett at richieburnett.co.uk
Mon Dec 28 14:44:16 CET 2020
It shifts the power dissipation from the voltage regulator (semiconductor) to a power resistor, which is likely better for MTBF.
But you could always use an active current source to maintain backlight brightness across a range of supply voltages as someone else said. Or even make the current programmable to give the user the option to dim the backlight if that's a feature you think is worthwhile.
Sent from my Xperia SP on O2
---- Tom Wiltshire wrote ----
>That’s a good idea since that’ll likely be the heaviest current draw of anything on the module.
>Extra bonus if it meant the remaining 5V draw was low enough you could use the regulator on the Nano and not have to add one!
>> On 28 Dec 2020, at 11:33, Richie Burnett <rburnett at richieburnett.co.uk> wrote:
>> You could always run the LCD backlight from the 12V supply through a suitably rated current limiting resistor.
>> Sent from my Xperia SP on O2
>> ---- Florian Anwander wrote ----
>>> Hi Ingo
>>> Am 28.12.20 um 11:25 schrieb Ingo Debus:
>>>> Can’t you use the LM1117 regulator on the Arduino Nano?
>>> The onboard regulator won't provide enough power for the LCD-backlight.
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