QLT, Italy have a broad range of LED Drivers. Their quality is renowned and JLEDs is pleased to be associated as a major distributor. Please view QLT’s website to select which item suits your application and then send us an enquiry. The small footprint LED COB design uses many of our standard subassembly components and is compatible with virtually all standard dimming protocols currently available. The LED itself maintains 95CRI typ (92CRI min) across the usable CCT range of 3000K.

I'm using the QLogic QLE2564 4-port 8Gb HBA. The problem I have is that when I attach the qlt target mode driver to the card, only 3/4 ports attach the driver. Ffffc10006854e58 pciex1077,2532, instance #0 (driver name: qlt) ffffc10006854b80 pciex1077,2532 (driver not attached) ffffc100068548a8 pciex1077,2532, instance #2 (driver name: qlt) ffffc100068545d0 pciex1077,2532, instance #3 (driver name: qlt) Those three ports do work. I've tried switching just instance #1 to the qlc driver (which should be an ok thing to do) but it causes a different port to have the driver not attached. There is always one port with the driver unattached.

Also if I configure it that way I get intermittent kernel panics from qlt. Anybody with qlt knowledge? Qlogic recommends using the bundled Solaris drivers for Qlogic cards, but they say they do not support the qlt driver so they won't say if there is a possible problem with the card itself. If I use the qlc driver all the ports show up as normal.

This project came about from my need for a light source for my Franken-ebay stereo microscope. I will have another instructable that will cover using this driver / dimmer card in a fiber optic setup. It is now available here: Main design goals for this project were: • Small size • 10 dimming levels + off • minimum 10W power handling • Fan control (on/off + PWM) Board files, logic, firmware, and source code can be found on my web page here Here is a video of me taking the prototype card though it's paces. Before starting the build there is a little bit of math required to select the LED, LED current limit resistor, and power supply. LED selection: This circuit can drive either a single led or a string of leds as long as they fall under the following conditions: • Max forward current of the string is 1A (1000mA) or less • Max forward voltage of the string is 24.5V or less LED current limit resistor: The CAT4101 datasheet includes the following table for setting LED current. LED current in mA current limit resistor value in Ohms 100mA 4990 Ohms 200mA 2490 Ohms 300mA 1690 Ohms 400mA 1270 Ohms 500mA 1050 Ohms 600mA 866 Ohms 700mA 768 Ohms 800mA 680 Ohms 900mA 604 Ohms 1000mA 549 Ohms.

Power supply selection: There are 3 conditions the power supply must meet to be used with this driver. • Unloaded voltage (floating / LEDs off) less than 25V • 0.5V greater than max LED (or string) voltage • Less than 6V over the LED (or string) voltage when LEDs are on) • Output current of the power supply is greater than the forward current of the LED (or string) + 100mA Example: In my case I am using a LED with a on voltage of 10V to 12V and a forward current of 1A (1000mA) (this is from the LED data sheet). To build the driver card you will need the following: Qty Value Digikey PN ref des Description 1 PCB N/A N/A OSHpark 2 0.1uF 50V 1276-1012-1-ND C2, C3 CAPACITOR 2 10k Ohm RMCF0603FT10K0CT-ND R3, R4 RESISTOR 2 1uF 35V 587-1437-1-ND C1, C4 CAPACITOR 2 2-1437565-9 450-1792-1-ND SW2, SW3 SWITCH TACTILE SPST-NO 0.05A 12V 1 See math See math for value R1 RESISTOR 1 7805DT LM78M05CDT/NOPB-ND IC2 Positive VOLTAGE REGULATOR 1 PIC12F1501 PIC12F1501-I/SN-ND U1 pic12f1501 micro 1 CAT4101 CAT4101TV-T75CT-ND IC1 1A constant current LED driver (PWM). My preferred method for assembly is to use solder paste and my toaster reflow oven.

You could also solder all the parts by hand with just a iron and rosin core solder just takes a little longer. The key for using solder paste is less is better. Use a toothpick or small syringe tip to dispense the paste.