Controlling Multiple LED Drivers with single PWM Output

Using Arduino LEDs and Multiplexing
9

ReefingAround:
Thanks for the replies everyone.

I'm planning on running a maximum of 2 drivers off one single pwm output.
So will I need a buffer?

As the PWM is a logic level input signal to the drivers I would think you would have no problems driving two such input pins with an arduino output pin, AVR output pins are quite strong compared to standard TTL output drive standards.

I have the spec sheet for the drivers however there's no mention about the current draw on the pwm input.

What you can't be certain of is if two different drivers will track identically over the 0-100% PWM range. That is a 50% PWM output may not give you 50% brightness when using two different driver modules wired to their LEDs. You can only try it and see if that might be a visual problem or not.
Lefty

Regards

Dan
Australia