Electronics > Beginners

How do I drive LEDs without flicker ?

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DeadlyChemist:
im not dead, moving in 2-3 weeks in a pretty nice apartment (42sqm)
after i buy a table i'll continue on the project.

however got this email:
Part Life Notification

Dear Valued Digi-Key Customer,

You have purchased the following part number from Digi-Key within the last two years. The manufacturer has announced an update to the part status.

Part Affected
Manufacturer   ONSEMI (VA)
Description   MOSFET N-CH 100V 5.8A DPAK
Manufacturer Part Number   FQD7N10LTM
Digi-Key Part Number   FQD7N10LTMCT-ND
Status   End Of Life
Last Time Buy Date   12/30/2022
Substitutes   Please click here

bit sad ngl but oh well, i have 50 of them, should be enough i hope

MrAl:

--- Quote from: DeadlyChemist on September 18, 2022, 04:03:07 pm ---im not dead, moving in 2-3 weeks in a pretty nice apartment (42sqm)
after i buy a table i'll continue on the project.

however got this email:
Part Life Notification

Dear Valued Digi-Key Customer,

You have purchased the following part number from Digi-Key within the last two years. The manufacturer has announced an update to the part status.

Part Affected
Manufacturer   ONSEMI (VA)
Description   MOSFET N-CH 100V 5.8A DPAK
Manufacturer Part Number   FQD7N10LTM
Digi-Key Part Number   FQD7N10LTMCT-ND
Status   End Of Life
Last Time Buy Date   12/30/2022
Substitutes   Please click here

bit sad ngl but oh well, i have 50 of them, should be enough i hope

--- End quote ---

Hi,

I would think there would be a thousand replacements by now made and sold.  Check around maybe find another part similar.

John B:

--- Quote from: MrAl on August 08, 2022, 06:35:29 am ---There is one other difference worth mentioning.  That is, that some LEDs are meant to be run at full current in order to ensure the color temperature does not change.  That means that it is best to operate the LED at the full current if you want the right light color output.  The nice thing though is that if we use a true PWM current drive, the LED always receives the max current, just less often, and so the light dims but the LED color stays the same.

--- End quote ---

I experimented around with this colour temperature issue with my lighting controller project and found it to be of little to no practical concern. First step would be to purchase good quality high CRI discrete LEDs or LED panels.

My understanding is that the colour spectrum would skew slightly towards the red direction of the spectrum for low currents (not red in colour necessarily, but e.g. you could have more green, which is more to the red end compared to blue.)

The effect is perhaps more noticeable with 6000K LEDs vs 3000K warm white LEDs, but this is at very low currents.

FWIW I settled on using low dropout linear regulation as it's very easy to have ripple free and accurate regulation from 1-700mA.

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