DIY LED driver for reef lighting

der_wille_zur_macht said:
It's the first of the chips we're using that's in one of the OOTB libraries!
Click to expand...

I still prefer my version [grin]. I put more space between pins, which makes it easier to lay out the schematic :)

Interestingly, as soon as I'd "use'd" the on-semi library, I could do a search and find 'CAT4101', but up until then, I couldn't, which is why I didn't find the part in the first place... [sigh]

Simon
 
shackscs, can you get anything more solid on it? That pdf is only one page and has a "preliminary" label on it. I tried looking around that company's website and it was difficult to find anything solid on any of their products. Mouser and Digikey don't stock their parts, so I'm not sure where you'd get them from.

It looks similar to the CAT4101 overall.
 
Here is what I found

http://www.datasheet4u.com/html/M/B/I/MBI6651_Macroblock.pdf.html

Macroblock
Features

Preliminary Datasheet

MBI6651

Step-Down, 1A LED Driver
Surface Mount Device

Backward compatible with MBI6650 in package 1A constant output current 96% efficiency @ input voltage 12V, 350mA, 3-LED 9~36V input voltage range Hysteretic PFM improves efficiency at light loading Settable output current Integrated power switch with 0.45ohm low Rds(on) Full protection: Thermal/UVLO/Start-Up/LED Open-/Short- Circuit Only 4 external components required
Small Outline Transistor PSD: GSD TO-252-5L

Product Description
The MBI6651 is a high efficiency, constant current and step-down DC/DC converter. It is designed to deliver constant current to light up high power LED with only 4 external components. With hysteretic PFM control scheme, MBI6651 improves the efficiency of light loading. The output current of MBI6651 can be programmed by an external resistor and LED dimming can be controlled via pulse width modulation (PWM) through DIM pin. In addition, the start-up function limits the inrush current while the power is switch on. The MBI6651 also features under voltage lock out (UVLO), over temperature protection, LED www.DataSheet4U.comopen-circuited protection and LED short-circuited protection Mini Small Outline Package
GST: SOT-23-6L

to protect IC from being damaged. Additionally, to ensure the system reliability, the MBI6651 builds thermal protection (TP) function inside. This function protects IC from overheating (165°C) in various application conditions. MBI6651 provides thermalenhanced packages as well to handle power dissipation more efficiently. MBI6651 is available in TO-252, SOT23-6 and MSOP-8 packages. GMS: MSOP-8L-118mil

Applications
Signage and Decorative LED Lighting Automotive LED Lighting High Power LED Lighting Constant Current Source

©Macroblock, Inc. 2009 Floor 6-4, No.18, Pu-Ting Rd., Hsinchu, Taiwan 30077, ROC. TEL: +886-3-579-0068, FAX: +886-3-579-7534 E-mail: info@mblock.com.tw -1Feb. 2009, V1.00
 
I did not work for me either, how ever I was eventually able to find page one of the data sheet. 4 external components not bad, but not schematic or pin layout. BUT I could not find it at mouser, digikey, or future

Based on this lack of info I would pass, but if you can find more please let us know
 
The MBI6550 need a cap, resistor, diode, and inductor as the external components. However, I can not seem to find that for sale anywhere either.
 
Supposedly it can run up to 8 3W LEDS.

I found it on Ebay as part of a driver for $7.50 while searching for heatsink material for my build.

But based on the lack of real information I would say that it is probably not a great choice.

Do a search of Ebay for 3w LED Driver to see the driver. I was more interested in the chip more than the driver. At 7.10 each driver, it is still more than I am willing to put out for my fixture since I need to cover a 72 x 24 area.
 
Last edited:
Has anyone considered putting terminals on the boards to connect the LEDS strings to or is the idea to continue to solder them to the boards instead?
 
I placed screw terminals on my boards. They don't sound bad by themselves .20-.30 cents or more, but for my board (8 drivers) it calls for 13 so it is two to four dollars more.
 
Hello guys,

Do you know if anybody has success of keeping SPS with LED lighting system?

Also, there are a lot of type of LED? The number of lumens is important but what's about the light spectrum of LED do you used ?

Best Regards!
 
ti,

Check out some of the threads I linked in the first post back on page one. For quick answers:

1) Yes, many people have kept SPS.

2) LOTS of types of LEDs, it's important to get the right color and spectrum. Luckily it's all been figured out, so you can pretty much follow the formulas outlined in those other threads.
 
My spacing wa 5.08 becuase that was what wome els pointed to. I think it was space cowboy, but there are a lot of options out there.
 
Last edited:
I used 3.5mm pitch just because it makes it more compact, which means less area used up on a small, crowded board. It's one of those things that strikes me as personal preference, there's no right or wrong.
 
ti,

You might want to post general questions in a new thread, or in one of the general LED threads, as this thread is mainly for DIY drivers.

To address your question, yes - the Rebel from Philips is a good LED. It has a wider viewing angle than some of the Cree LEDs people are using, but the efficiency is OK.
 
DER,

Did you account for the 4 terminal block on the dual board?

It was not listed in the BOM so I was checking as I am ordering the boards tonight or tomorrow. Not that it has any bearing, just wanted to know.

I also have to get two parts from mouser that digikey did not have in stock so I may was well pick up a few of these too.

Also any one got a picture of the dual board after assembly? For us new to electronics, the visual is always helpful. :)
 
You must log in or register to reply here.

Similar threads

C
DIY Stand for Flatback Hexagon Tank
Replies
2
Views
765
Drummer98
Drummer98
T
Looking for a specific tank build - EZTube.com sent me here
Replies
6
Views
538
Reefing102
Reefing102
Emanuel92
What lighting for S. haddoni and E. quadricolor?
2
Replies
20
Views
1K
Hong Kong
Hong Kong
C
Scored a complete setup for $100
Replies
13
Views
1K
griss
griss
R
Red tufty algae - Asparagopsis - any expert advice for removal?
Replies
14
Views
2K
rallibon
R
Back
Top