| Electronics > Projects, Designs, and Technical Stuff |
| 9VDC + 5VDC SMPS for driving LEDS |
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| Blade2Raiden:
Hi, I'm trying to find information as how to build a switching power supply that can output 9VDC to drive LED's but it must have at least 3 AMPS on this rail and a 5 VDC for logic board that will control the unit. I intend to replace the Tube lamp from a desk magnifyer with a pcb. The LEDS I found out to suit my needs are the Bridgelux BXEN-50S-13H-9C-00-0-0 (9V 0.1A), and I wanted to put 30 of them on the Ring which means 3A minimum. Logic board will be simply an Arduino Nano (ATMEGA128P) to be able to control over PWM the LED's, I've been thinking of using EPC2203 to supply the LED's, I'll see about that later on in the design process. Big thing is I've never built a SMPS ever before, I have the skills to build one but never learnt how they worked, so I hope people on here can help me out understand how to get this right. Maybe provide basic schematics and how to do the math that goes with it, Thanks for any help! |
| will_raymo2000:
I have designed a constant current driver PCB based on the AL8843 chip which is capable of 3A max. Am currently troubleshooting a layout issue but am happy to share design with you in Eagle format. Further to the post here: https://www.eevblog.com/forum/projects/al8843-led-driver-problems/ I have now got both PCBs working and not killing LEDs with voltage spikes. Not sure if thats suitable for your application as its CC not CV. |
| Blade2Raiden:
design is quite simple, I like it, but I'm going from main source so 120VAC, so I'd need something to step-down first and a transformer might be too heavy and probably won't output enough power for my application, I'm wondering if there's IC's powerful enough for that (well I think so after LED light bulbs work this way), 3 amps is my minimum though and I must be able to add a 5VDC output, that's where I'm quite lost |
| will_raymo2000:
I went through a similar process and ended up selecting a Mean Well chassis mount power supply as it was more of a robust solution (and cheaper) to something I could make myself. Here in the UK a 6.5A 12v mean well supply is about £11.50 which would accept your mains voltage too - worth a look. Then you can use a switching regulator chip for the 5V part and use a circuit similar to mine to run the LEDs |
| Mr Evil:
Are you sure you need that much power? 27W of LED lighting is a lot. Half that much will light an entire room very brightly. |
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