I am hoping to control an LED using a arduino controller. However, the trick is that it cannot be PWM driven. I need a stable light. Does anyone know of a LED driver that may fit these specifications? Something like a variable current driver where the current is controlled via a PWM signal from the arduino? Any and all advice would be appreciated!
Kind Regards,
Kenneth D. Hoadley
Most higher-power constant-current LED drivers put-out DC current even when they are controlled with PWM.
The industry standard is 0-10V DC or 10V PWM but there is usually an internal 10V supply and pull-up so they can be controlled with an open-collector transistor from the Arduino.
I can only guess as you did not give any real detail for the LEDs you are driving. Consider the: CAT4004B: LED Driver, Constant Current Programmable with 32 Dimming Levels, the data sheet is at https://www.onsemi.com/pub/Collateral/CAT4003B-D.PDF. This response is to help you get started in solving your problem, not solve it for you.
Good Luck & Have Fun!
Gil
Like DVDdoug said.
Most LED drivers, even switching ones, output a constant DC current that you can change with a DC voltage or variable resistance. But we usually use PWM (on/off control), because it's easier/predictable.
Why do you want current control, and for which LEDs.
Leo..