| Electronics > Projects, Designs, and Technical Stuff |
| Cheap LED driver and cheap RGB LED quality |
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| 3dgeo:
Hi, I designed PCB around 16 output TLC59116IPWR (US$1.1833), but recently I found IS31FL3236A-QFLS2-TR, a cheap (US$0.547) 36 output IC. Currently I'm making sample PCB to test it, but I wanted to know community opinion on it. It's package is really small for 36 output @38mA (MAX), I'll be using it @5mA (may be 10mA) with RGB 3528 LEDs. Tho I'll make test PCB to test it @20mA. Also I should mention that IS31FL3236A has a very nice feature – it stores RGB values in a buffer and latches them all at once when it receives I2C commend to do so. A small disadvantage is that its max PWM is @22Khz vs 100Khz on TLC59116IPWR, but I don't think it will effect my design. Also I would like to discuss RGB led quality, due to specific reasons I will be using 3528 "regular" SMD mount RGB LEDs, but I'm noticing they are being phased out on LCSC, and on Digikey they are way too pricey. But on Ali they are incredibly cheap 1000pcs - ~4usd, I actually got few batches from ALI and they seem to have some visible light inconsistencies at low brightness. I guess my question would be what is the difference between expensive and cheap LEDs? Is expensive LEDs more consistent, brighter? Price difference is 0.4ct vs 40ct or more. If you have something related to say – say it, just wanted to get some feedback cos rerouting PCB will take at least few days, but I will be saving a lot on LED drivers (3 of them per board) in a long run if that chip turns out to be as good as it looks. Have a great day :-+ |
| SiliconWizard:
Oh, I was first thinking you'd be switching to an obscure and not well documented unknown chinese chip, but it's an ISSI chip which looks pretty decent. Thanks for pointing it out, I may have some use for this later! As to power dissipation, it has a small QFN package but of course with a thermal pad. Soldering the thermal pad and adding a few vias through the pad on PCB is definitely not optional. |
| 3dgeo:
It's hard for me to understand – are you being sarcastic only in 2nd part of your post or in 1st also ;D |
| SiliconWizard:
Oh, in neither actually, for once! |
| 3dgeo:
So why you think vias on thermal pad is not optional? I added 5 vias. Mind sharing what your plans with this IC? Doing some LED stuff as well? |
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