The LED board and the driver with the components for the first channel installed are ready. So we can proceed with the first tests. The Attiny25 microcontroller has not been soldered yet. As you know, I will need a PWM signal to control the current source. For this purpose, I will temporarily use an Arduino Nano module.

I prepared a very simple program to generate a PWM signal incrementally from 0% to 100% in Arduino IDE. I uploaded the program to the board. I connected the Arduino module to the LED5000 using test points at Attiny25 on the driver board. The whole thing is ready to run.

First startup (warm channel). All the LEDs light up but the light flicker is very high. The LC circuit goes into oscillation .The coil generates ac noise, which can be heard around 15-18kHz.

It seems that you need to experiment with the value of capacitor C12. Initially the value of the capacitor placed on the output was 47uF. I reduced the value to 10uF but the problem with the light flicker still occurred. I then reduced the value from 10uF to 1uF. I noticed a significant improvement (no blinking effect). Also the unwanted acoustic noise from the coil stopped. I checked the operation of the circuit at different PWM duty cycle values (f=32 kHz). I decided to use the value of C12=470nF. However, this is not the final value. We will see during further tests