I want to control some white led lights (datasheet) with PWM.
The Leds are in a parallel-series circuit with 3 leds per series and multiple of those in parallel. (See Image below) The Leds itself are rated 3.4V, but because I am already using a 24V 6.25A Power Supply with some other stuff, I am running 24V lines and use a 155 Ohm resistor infront of each series.
How would I control all those leds with a 3.3V PWM signal? I saw some circuits using Mosfets but I have never used one of those so I am not sure what I am looking for if I would use one. The Mosfet would also have to be infront of the load, due to the Ground beeing shared with the other parts of the circuit.