Light-emitting diode (LED) light output continues to increase, and color and white high-brightness LED applications have expanded to new market segments. LEDs have begun to replace incandescent and fluorescent lamps for automotive, consumer electronics, building lighting and general lighting applications, from smartphones to LCD TVs. In the future, LEDs will continue to change the lighting market with its programmability and flexibility and innovative solid-state lighting (SSL) solutions.
LEDs are low voltage devices that can be driven between 2V and 4.5V depending on color and current, and are driven at a constant current to ensure the required light intensity and color. This requires a power conversion and control scheme to connect different power sources, even batteries. ON Semiconductor offers optimized drive solutions for low-voltage portable and medium voltage LED general illumination to meet the lighting needs of different applications.
Low-voltage portable LED driver topology and ON Semiconductor solutions
White LEDs and RGB tri-color LEDs are widely used for small color LCD panels, keyboards and indicator backlights. Smartphones and digital cameras use high-brightness LEDs as flash sources. These applications require long battery life and minimize PCB area and height. ON Semiconductor offers a variety of solutions using linear, inductive and charge pump topologies. The inductive solution has the best overall energy efficiency; the charge pump solution uses low-profile ceramic capacitors with minimal space and height; the linear solution is ideal for color indicators and simple backlighting applications.
1) Inductive boost and buck topology
For white LEDs that drive low-voltage portable device backlights and flashlight/flash applications, ON Semiconductor offers different products that use PWM dimming. The booster's output current ranges from 20 mA to 800 mA, including CAT37, CAT32, CAT4238, CAT4237, CAT4238, LV52204, LV52206, CAT4137, NCP5005, CAT4139, CAT4240, and NCP1422. The output current of the inductor step-down product NCP1529 is 1 A.
Figure 1: Inductive Boost Topology
For example, the LV52204 is a single-channel high-voltage and energy-efficient LED backlight boost driver IC for smartphones with an input voltage range of 2.7 V to 5.5 V, 40 V output voltage and 10 LEDs. Its pins are compatible with popular products on the market and can be easily replaced.
2) Charge pump topology
ON Semiconductor's patented Quad-Mode® adaptive fractional charge pump solution provides the energy-efficient level of inductive LED drivers, eliminating high-thickness inductors and harmful electromagnetic interference (EMI). The four-mode architecture adds a fourth mode of operation (1.33x), requiring no additional capacitors, a 10% increase in energy efficiency and a 65% reduction in package size.
Figure 2: Charge Pump Topology
For LCD backlights, LED flash/flashlights and indicators, ON Semiconductor offers a wide range of charge pump/white and RGB LED driver products with total output currents from 10 to 192 mA, including NCP1840, CAT3606, CAT3616, CAT3626, CAT3636, AT3637, CAT3649 , CAT3604A, CAT3604V, CAT3614, CAT3644, NCP5623B/C, CAT3643, CAT3647, CAT3612, CAT3224 (4 flash, 400 mA flashlight), NCP5612, CAT3661, NCP5603 (200 mA DC, 350 mA pulse), CAT3200, CAT3200H.
3) Linear topology scheme
For LCD backlight applications in portable devices such as mobile phones, ON Semiconductor offers a variety of simple linear white LED drivers. It features single-line EZDim interface dimming with 32 levels of dimming control; 25 mA fixed current (version B) or adjustable current (A version). These single-mode LED drivers can be used as part of the system level to design backlight circuits that integrate low-voltage LEDs with simple LED drivers.
Figure 3: Linear topology
4) Other dedicated drives
ON Semiconductor offers dedicated LED drivers for applications such as camera flash and flashlights, such as CAT3224 and CAT3612 (charge pump topology), CAT4134 (inductive boost topology), which can provide different flash currents and brightness from 150 mA to 4A. Meet the ever-increasing demand for LED light output instead of camera phones, smartphones and xenon lamps.
ON Semiconductor also offers a variety of drive solutions for RGB LEDs, such as multi-channel multifunction LED drivers with independent RGB on/off (LV5207LP and LV5216CS), flash/electric cylinders for 7 to 16 LED channels, RGB illumination, Applications such as main LCD backlight, auxiliary LCD backlight, and RGB lighting drivers (LV5217LP and LV5223GR) are used to support color lighting design to achieve rich lighting colors for portable devices.
The RGBW Color Controller is in a predetermined order to change the main circuit or control circuit wiring and circuit changes the resistance value to control the motor start, speed, braking and reverse master device to control RGBW color.
The same design with RGB Color Controller . The difference in coding for RGB and Rgbw Color Controller.
The RGBW Color Controller subassembly logic controllers and micro-program controller two controllers each have strengths and weaknesses. Combinational logic controller designCumbersome, complex structure, once the design is complete, you can not modify or expand, but it's fast. Micro-controller design program easy, simple structure, convenient to modify or expand, modify a machine instruction function, simply restated the corresponding micro-program;
To add a machine instruction, just add some micro-control program in memory, however, RGBW Color Controller is through the implementation of a micro program.
Specific comparison is as follows: a combination of hardwired logic controller, also known as the controller, by the logic circuit, relies entirely on hardware to achieve the function of the instruction.
RGBW Color Controller Basic components
(1) the instruction register is used to store instruction being executed.
(2) Operation code decoder: instruction opcodes for decoding to produce the corresponding control level, to complete the analysis function of the instruction.
(3) Sequential Circuits: used to generate a time stamp signal.
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RGBW Color Controller
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