elcheapo driver and LED diybulb best combo - Page 1
Forum section: electronics / projects

author: dave_j_fan
author_rank: Regular Contributor
timestamp: November 03, 2014, 05:52:35 pm
content: LED bulb ideaI have got 5630 leds per led is 60LM brightnessmeans i need 12 leds to get 720 lumensmeans i need 4 strings of 3 leds as in the diagramgot 300mA led drivers for 3x1w spot lightslike thishttp://www.satisled.com/11w-power-led-driver-ac85v265v-input-dc338v-300ma-output_p1500.htmlHow do i add current from two drivers ?wil two strings work reliably in the constant current driver (not using 555)elsefor the full bulb i will put 2 of the 555 circuits each feeding from one driverPoint of making the bulb is the quality of the drivers is very good and low cost ,smdleds of good quality ihave gotAll works fine we will have a 6wattbulb.I thought of making it like a mini tube .please suggest better alternatives !This will go working with the LED inverter i made

author: Marco
author_rank: Super Contributor
timestamp: November 03, 2014, 06:31:41 pm
content: You're all over the place, you have a schematic with 12V supply and then you mention using constant current AC-DC supplies, then you mention an inverter you made.If you have those drivers already and the 5630 LEDs are designed for ~150 mA, what I would do is put two strings of 3 with current sharing resistors ora current mirroron each driver ... no need to parallel the drivers then.I don't know if those constant current drivers will appreciate being PWM dimmed.

author: Corporate666
author_rank: Unknown
timestamp: November 03, 2014, 11:16:13 pm
content: It's not going to work like you are thinking...According to the link to the drivers, they are AC input and output 3 to 3.8V DC with a 300mA constant current. So you're not going to be able to drive a string of 3 or 4 white LED's with that driver.Also, those 5630 LED's are rated for 150mA, but they will need quite a bit of heat sinking at that temperature, and it's not their most efficient by far. You would do well to run them more like half that value for better efficacy and longer life (and less heat). Of course, you'll need more LED's, but them's the breaks.If I were doing this, I'd use a standard AC->DC "wall wart" power adapter to get down to something like 24 or 36 volts and then build and CC LED driver with DC as my starting point.Or, if I was looking to buy something off the shelf, I'd start with an AC->DC LED driver, like something from these guys ->http://www.trcelectronics.com/I most definitely would not mess around with exposed AC->DC drivers from a Chinese source if I wasn't very very sure about exactly what I was doing and how to do it safely, and I suggest the same to you.

author: dave_j_fan
author_rank: Regular Contributor
timestamp: November 04, 2014, 09:57:37 pm
content: Thank you marcoi intended to work out a middle path ..not too expensive yet a reliable onei made few 2transistor LED desk lamp that runs off the cell chargergives 10hr backup with simple components i.e. a powerbank here lot many (1000+) poor and hostel studentstook that idea!!so i posted the dc driver circuit to keep design simpleI also have pt4115 led drivers .Corporate666*very sorry for the wrong link to the driver type This is the suitable link -->The driver is designed for spotlight usehttp://www.satisled.com/31w-power-led-driver-ac85v265v-input-dc914v-300ma-output_p206.html*china drivers are NOT from the same vendor , i got from a leading china firm they do all types of LED lightsToday tested the leds ...good pretty bright lights from 7LEDs yes @ the favorite brightness the leds get pretty hotHow about if i mount them on heattransferring silicon rubber and solder with enamelled wire .need to device a trick to glue themkepton tapeshould work or i will make a aluminum jacket from coke can foilworked with smd5050 they run cool but pain to solder..many led half current trick also will consider