I had to replace the power supply on an LED downlight after the old one got full of water. It was rated at 24 V, 150 mA, and I bought the 4-7 W version offered here:-
I thought it would be quite simple to cut down the current a bit.
The circuit of the LED driver was this:-
The datasheet for the IC is here:-https://www.lcsc.com/datasheet/lcsc...Silan-Microelectronics-SDH7611STR_C601125.pdf
I tried to increase the 1.6 Ohm resistor but I found that I couldn't increase it beyond 2.5 Ohms without the LEDs flickering and being very dim.
Adding a resistor load in parallel with the LED could also make the LEDs stop flickering. I ended up with 1500 Ohms in parallel with the LEDs, and the current setting resistor at 2.5 Ohms. The LED driver produced about 165 mA with the 2.5 Ohm current setting resistor and the 1500 Ohm resistor takes around 15 mA, leaving the 150 mA that I wanted in the LEDs.
Has anyone got any idea why the LEDs flickered when I tried to lower the current?
I thought it would be quite simple to cut down the current a bit.
The circuit of the LED driver was this:-
The datasheet for the IC is here:-https://www.lcsc.com/datasheet/lcsc...Silan-Microelectronics-SDH7611STR_C601125.pdf
I tried to increase the 1.6 Ohm resistor but I found that I couldn't increase it beyond 2.5 Ohms without the LEDs flickering and being very dim.
Adding a resistor load in parallel with the LED could also make the LEDs stop flickering. I ended up with 1500 Ohms in parallel with the LEDs, and the current setting resistor at 2.5 Ohms. The LED driver produced about 165 mA with the 2.5 Ohm current setting resistor and the 1500 Ohm resistor takes around 15 mA, leaving the 150 mA that I wanted in the LEDs.
Has anyone got any idea why the LEDs flickered when I tried to lower the current?