10W-RGB-LED-DRIVER: Difference between revisions
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All three colors have a common Anode (+), and separate Cathodes (-) for each color.<br><br> | All three colors have a common Anode (+), and separate Cathodes (-) for each color.<br><br> | ||
Despite their size, do not be fooled into thinking these are like regular indicator LEDs that you see on circuit boards.<br> | Despite their size, do not be fooled into thinking these are like regular indicator LEDs that you see on circuit boards.<br> | ||
''These units can generate enough heat to burn themselves out if not attached to a heatsink.'' | '''These units can generate enough heat to burn themselves out if not attached to a heatsink.''' | ||
== BOM - Bill of Materials == | == BOM - Bill of Materials == | ||
Revision as of 18:29, 10 January 2015
A Constant Current Driver Board for 10W RGB Modules
This circuit board is specifically designed to drive 10W RGB LED modules.
It has the ability to drive a 10W RGB LED via a 5v DC PWM signal that will allow
dimming of each individual color.
As a separate 12V power source is applied to the board, three additional connections are made to the board that can
control the brightness of each color separately.
These connections are typically the 5V DC output pins from a microcontroller.
This board works with the Ren32/64/48LSD and most RGB strip controllers.
Mostly through hole, inverted inputs (no software tweaks required,) and off when no signal.
The boards are designed to fit standard 10W LED flood light enclosures.
10W RGB LED
This board was specifically designed for a commonly found 10W RGB, common anode, LED.
These square form factor LEDs can be found at many online stores, ebay and aliexpress.
This board was designed to the dimensions shown in the picture to the right.
Typically characteristics of these LEDs would be:
Color: RGB
DC Forward Voltage (VF): Red 6-8V, Green 9-12V, Blue 9-12V
DC Forward current (IF): 300MA
Output Lumens: Red 120-150LM, Green 200-300LM, Blue 70-100LM
Wave Length : Red 620-625nm , Green 515-520nm, Blue 455-460nm
Beam Angel: 140 degrees
Life span: >50,000 hours
As you can see from the picture to the right, these LEDs are not very large,
less than 1" square.
All three colors have a common Anode (+), and separate Cathodes (-) for each color.
Despite their size, do not be fooled into thinking these are like regular indicator LEDs that you see on circuit boards.
These units can generate enough heat to burn themselves out if not attached to a heatsink.
BOM - Bill of Materials
The BOM for this board uses both surface mount(smd) and through-hole components.
The only mandatory smd part is the constant current driver IC, the PT4115.
The board can use either through-hole or smd inductors. The BOM shows through-hole inductors.
BOM for 12V DC power input:
QTY Board ID Description 3 IC1,IC2,IC3 PT4115 by Powtech: 30V, 1.2A Step-down High Brightness LED Driver with 5000:1 Dimming 3 L1,L2,L3 100uH Inductor, 6x8mm, 700ma 3 T1,T2,T3 Transistor FJN3314R 3 D1,D2,D3 Diode 1N5819 3 R1,R2,R3 Resistor, 1/4 Watt, 0.33 Ohm, 5% or better, carbon or metal film 3 R4,R5,R6 Resistor, 1/4 Watt, 4.7K (4K7) Ohm, 5% or better, carbon or metal film 1 IC4 Voltage Regulator, 5V 78L05 1 C1 Electrolytic Capacitor 100uF 35v (polarized) 1 C2 MLCC Ceramic Capacitor .1uF 50v (monolithic)
Assembly Tips
This board had only one part that will take some small amount of skill to install, the PT4115.
While this is an smd part, it can be hand soldered successfully.
To do so, you will need, some liquid flux.
This is the only part that really needs the liquid flux, however, you may also find it useful when you solder the LED.
The LED can be mounted to the top or the bottom of the board.
It may not seem like much, but this clearance difference can be a key to success when retrofitting this board into a repurposed LED Flood Light assembly.
Installation examples
pictures of installations .
Schematic
Here is the Schematic diagram as captured from EAGLE.
