I am using an Arduino Due to drive LEDs with a PWM cycle of 20kHz. The due does not output enough Voltage or current so I am hooking up the output of the Due to a transistor and using a power source to meet the LEDs requirements.
At such a high PWM I am worried about discharge rates on the transistors. Should I be using a separate PWM driver or can the Due handle creating a clean 20kHz duty cycle rate?
Better if you use special MOSFET driver. Depends on a current demanding by LED's, there are some driver's that could directly operate with LED's w/o transistor.
For example, IXD_614, 4A continuous current, 14A pulse peak, 35V.
serenitysax: @FantomT
That is what I thought. I like the idea of having single drivers though. Can you recommend anything with operating voltage of 12-6 V?
It's o'k if IC has higher voltage range, like 4.5V to 35V. How do you power your led's?
@FantomT I have been powering them from the Due 5V port. Though I have a Variable DC voltage generator that I would power the drivers off of if I had them. All of the LEDs are around 3V and 20 mA
serenitysax: @FantomT I have been powering them from the Due 5V port. Though I have a Variable DC voltage generator that I would power the drivers off of if I had them. All of the LEDs are around 3V and 20 mA
Those low power led's better to interface with specially designed IC, TLC5940 or TLC5916