Electronic – How to dim an LED with constant current supply

constant-currentdimmingled

I have a power RGB led with 350 mA max per color. If I get 3x 300-350 mA constant power supplies will I be able to dim each individual color from 0 to 100% power with Arduino (with NPN transistors)?

I am a bit confused since constant current psu's are the best way to power led's but since they provide constant current can they be dimmed with pwm as one would expect with any power supply?

I am thinking of this PSU.

Best Answer

Yes, you can use PWM to dim LEDs with constant current power supply.

Personally I would go with MOSFETs instead of NPN transistors. If nothing else MOSFET will dissipate less heat.

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