Qx5252F Led Driver For Mac4/23/2021
I added three resistors because I had three different colors.When I connect them to the QX5252 without any resistors only the yellow ones turn on.I added resistors to balance the current and it kind of worked.
Then I disconnect and connect the battery and they turn on for another minute. Could you please let me know how I can make this project happen. Also, I want the LEDs to be on at night and the battery gets charged during the day with the 2V solar panel. My problem is the LEDs turning off after one minute even though the battery is fully charged. You should not need more than a few mA if you use high luminous intensity LEDs. Use only 2V red, yellow, and orange LEDs. Qx5252F Led Series May WorkNiMH batteries in series may work better. Use current mirror transistors to balance rather than resistors: Current distribution in parallel LED strings. A 400 nm purple LED would need 773 times more photons than a 470 nm blue LED to achieve the same luminous intensity. A 12.4 mols of photons are required to get 1 lux from a 400 nm LED. Solar cells need a lot of irradiance to produce usable wattage. There are some that are made especially to work with a single alkaline or NiMH battery. This regulator uses a small 3.3mH inductor and is has good efficiency for your project even when the battery is nearly discharged at 1.1V. Measure the forward voltage of each LED before calculating its resistor value. Tweak the voltage of the converter to just above the highest forward voltage for maximum efficiency. If the LED has a 3.1V V f and the supply is 3.3V the efficiency will be 94. If you use a high intensity green you can run it at about 1 mA. This may seem low in comparison to the Cree 60,000 mcd green. I think using the white rater than yellow wikll give yu a much beter chance of getting the QX working. Use only 2V red, yellow, and orange LEDs.-- I cannot eliminate the green and purple LEDs. In this case, the Vf of all colors will be closer to each other(around 3.0 to 3.2 v). I am also going to try the current mirror circuit that you suggested. The proper battery charging with the solar panel will be my next step. As this, can you tell me what your Forward drop for each LED type is.
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