Timeline for How can I get similar brightness out of individually driven LEDs?
Current License: CC BY-SA 4.0
6 events
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| Oct 12, 2023 at 21:25 | comment | added | hacktastical | If your truly working with a strip of parallel LEDs, the cheap-and-cheerful way to improve matching would be to replace the resistor that's on each LED with a higher value and increase the drive voltage. | |
| Oct 12, 2023 at 21:08 | comment | added | hacktastical | That said, are you really constrained such that you can't wire the LEDs in series? If you have access to all the LED terminals you can do whatever you want. Boost CC LED drivers are cheap and efficient. | |
| Oct 12, 2023 at 21:07 | comment | added | hacktastical | I disagree. A multichannel constant-current driver can be initialized by a low-cost microcontroller, such as an AVR Tiny. This is fewer components (and probably lower cost) than using individual limiters. Then you have a two-chip solution that can support dimming. Meanwhile, an issue with making a multi-channel current mirror as suggested elsewhere (and in my answer too) with discrete components is that current mirrors require matched transistors. | |
| Oct 12, 2023 at 20:31 | comment | added | Matthew | BTW, as elsewhere noted, using a multi-channel driver (unless you know one that has parallel inputs) is hard for my application. Ignoring the extra features, how much difference is there between a "fancier" driver and a 2-pin CCR? If you have any thoughts on that, it would make a great addition. | |
| Oct 12, 2023 at 20:18 | history | edited | hacktastical | CC BY-SA 4.0 | added 439 characters in body |
| Oct 12, 2023 at 19:45 | history | answered | hacktastical | CC BY-SA 4.0 |