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Noduino OpenLight
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=== MY9291 === OpenLight use the Taiwan Mingyang 4 - channel constant current LED driver ICS to control the R, G, B, w 4 LED lamp bead ;;Feature: * 3.3 - 5V power supply voltage range (±10%) * Each channel 5-350mA constant current output range * Maximum output voltage of 24V, support more than one LED in series * Few external components, only need four external groups to set the four constant - current ;;Block Diagrame: [[文件:MY9291.app.jpg | 600px]] For constant voltage power source, can be cascaded, MCU control of two lines : DI & DCK ;; Power supply voltage and lamp bead series/parallel connection and to make sure: * 12V Power supply, 4 LED beads shall be in series if the LED VF is 3V. 6 LED beads shall be in series if the LED VF is 2V * 24V Power supply, 8 LED beads shall be in series if the LED VF is 3V. 12 LED beads shall be in series if the LED VF is 2V * 6V Power supply, 2 LED beads shall be in series if the LED VF is 3V. 3 LED beads shall be in series if the LED VF is 2V ;; Output current MY9291, maximum output of 350mA for single channel, in order to save life of lamp beads, can limit the maximum current through the lamp bead to save the life of lamp beads Maximum output current limit: R = 380mV / Iout Full output of 350mA, then each current resistance has to be selected as follows : 1R,1/4 w enough OpenLight bulbs, R/G/B use 4R7 resistor, and current limit is about 81mA, W use parallel of 2.35R and two 4R7,current limit is about 162mA.This basically limit the current at around 80mA through each 5730 ( 0.5W ) lamp to delay aging of the lamp beads. Thus overall power is limited to 5W, if need to increase the brightness, the 5 4R7 resistor can be replaced by 3R0, also can increase the output power to 7W <br><br>
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