Comments on: powerRGB

By: theFloe

theFloe — Thu, 19 Feb 2009 21:42:07 +0000

Above i wrote that I tried some MOSFET’s and i forgot always to update to schematics. For the type of MOSFET drawn and mentioned here that updated schematics makes more sense. The RDSon is just an approximate value. See figure 1 in the datasheet. For Vgs & Vds at about 5V the diagram states about 100A which would lead to 50mOhms. But needer Vgs nor Vds are at 5V, but I think that the 50mOhm are a good choice.

By: Sven

Sven — Thu, 19 Feb 2009 21:30:22 +0000

Wow you answered fast! Does this mean its all true what i’ve said?

By: Sven

Sven — Thu, 19 Feb 2009 21:29:14 +0000

Another thing. Where do you get that Rds on = 50mOhm from?? in datasheet i find 1.8 – 5 Ohm.

greets,

Sven

By: theFloe

theFloe — Thu, 19 Feb 2009 21:22:12 +0000

changed it…

By: Sven

Sven — Thu, 19 Feb 2009 20:42:23 +0000

Bit late but, wouldnt it be better if you deleted R1,R2 and R3??
And R4,R5,R6 to ground!

Explanation: The mosfet doesn’t need any resistance in the gate because it is voltage controlled.

But the resistors to the ground are needed bacause when the pin of your AVR will become 0V, the gate voltage will try to run trough your avr. Simply prevented with the pulldowns.

Is this making any sense? I’m making a similar project as we speak. Any other useful tips for me?

greets,

Sven

By: Lukis Home » It’s up and hanging!

Lukis Home » It’s up and hanging! — Sat, 31 Jan 2009 19:34:06 +0000

[...] angesteuert und verpackt wÃ?Â¤ren. Nach etwas recherche schien es mir am einfachsten ungefÃ?Â¤hr diese Schaltung nachzubauen. Allerdings wÃ?Â¤hlte ich einen anderen Mikrocontroller (AtTiny25). Eine Farnell [...]

By: theFloe

theFloe — Thu, 15 Mar 2007 00:34:31 +0000

The one shown in the link is o.k. for powerRGB. I bought mine via Ebay from a Seller in China.

By: Thomas

Thomas — Mon, 05 Mar 2007 18:10:13 +0000

Hello Tobi,

which RGB LED you’ve used and where you bought the led? the only RGB LED I find here is the http://www.led1.de/shop/product_info.php?pName=prolight-power-rgb-led-3-watt-ga-p-308&cName=prolight-power-leds-prolight-power-rgb-leds-c-8_73

By: theFloe

theFloe — Thu, 22 Feb 2007 18:44:53 +0000

I had problems with some MOSFET’s and with the resistors it worked well…
Leave at least the series resistor (r1-r3) to limit gate charge currents.

By: Monkey

Monkey — Thu, 22 Feb 2007 07:38:48 +0000

Why you have those R4 to R6 + Vcc connections? This would work better without them.

By: theFloe

theFloe — Mon, 05 Feb 2007 08:38:13 +0000

Hi,
any N-Channel, Enhancement, Logic level MOSFET should be o.k. You should also select some with low Rds_on. For the STORM hack I used some IRL3103 ( http://www.irf.com/product-info/datasheets/data/irl3103.pdf ).

Hope that helps… Tobi

By: William

William — Mon, 05 Feb 2007 06:24:06 +0000

Can you provide some part # for the MOSFET that will work with powerRGB? I’m not all that familiar with them, and a stab at Digikey’s search function didn’t return anything useful. Thanks.

BTW, I find this a much simpler circuit than others I’ve seen, and I like the extensibility to cover higher power RGB. Thanks for posting!

By: tinyRGB at Tobi’s Corner

tinyRGB at Tobi’s Corner — Thu, 21 Dec 2006 11:54:27 +0000

[...] If you want to control power LED’s read here: powerRGB. [...]