LED lighting lamps have been developed by leaps and bounds in the near future, and LEDs have been widely recognized as green and environmentally friendly clean light sources. Led light source has long service life, energy saving, power saving, simple and convenient application, and low cost of use. Therefore, it will be widely used in home lighting. According to the survey and statistics of Osram Optical Semiconductor in 2008, the global annual shipment of home lighting lamp holders is about 500 Billion.
The technology of led light source has matured day by day, and the luminous lumens per watt has increased rapidly, which has promoted its decreasing price year by year. Taking 1W led light source as an example, the price in the spring of 2008 was one-third of the price in the spring of 2006, and in the spring of 2009 it will be reduced to one-fourth of the price in 2006.
The massive market of led green lamps and the continuous and stable growth demand for several years will be the super tsunami of the consumer electronics market after VCD, DVD, mobile phone, and MP3 in the integrated circuit industry! The superior performance of led lamps with high energy saving, long life and environmental protection has been universally recognized.
LED high energy saving: DC drive, ultra-low power consumption (single tube 0.03W-1W) electro-optical power conversion is close to 100%, the same lighting effect is more than 80% energy-saving than traditional light sources.
Led long life: led light source is called long life lamp. Solid cold light source, epoxy resin encapsulation, there is no loose part in the lamp body, there are no shortcomings such as easy burning of filament, heat deposition, fast light decay, etc., and the service life can reach 50,000 to 100,000 hours, which is 10 times longer than that of traditional light sources. Times more.
Led is environmentally friendly: led is a green light source with better environmental benefits. There is no ultraviolet and infrared in the spectrum, low heat and no flicker, no radiation, and the waste is recyclable, no pollution, no mercury, cold light source, safe to touch, it is a typical green lighting source.
Working characteristics of led light source The VF voltage of lighting led light source is very low, generally VF =2.75-3.8V, IF is 15-1400mA; therefore, the output voltage of led driver IC is VF XN or VF X 1, IF constant current is 15- 1400mA. There are two types of LED light sources used in led lamps: low-power (IF=15-20mA) and high-power (IF>200mA)). Low-power LEDs are mostly used for LED fluorescent lights, decorative lights, and grille lights; high-power LEDs are used for Home lighting, spotlights, underwater lights, wall washer lights, street lights, tunnel lights, car work lights, etc. Power LED light source is a device driven by low voltage and high current. Its luminous intensity is determined by the size of the current flowing through the LED. Excessive current will cause the attenuation of the LED light, and too weak current will affect the luminous intensity of the LED. Therefore, the LED The driver needs to provide a constant current power supply to ensure the safety of high-power LEDs and achieve the desired luminous intensity.
In the field of LED lighting, to reflect the characteristics of energy saving and long life, it is very important to choose a good LED driver IC. Without the matching of a good driver IC, the advantages of LED lighting cannot be reflected. Technical details that need to be paid attention to when designing led lighting.
Requirements for low-voltage driver chips for led lamps:
1. The nominal input voltage range of the driver chip should meet DC8-40V to cover the needs of the application. It is better if the withstand voltage can be greater than 45V; the output voltage of the simple bridge rectifier when AC12V or 24V is input will fluctuate with the grid voltage Especially when the voltage is too high, the output DC voltage will also be too high. If the driver IC cannot adapt to a wide voltage range, it will often be broken down when the grid voltage rises, and the LED light source will be burned out.
2. The nominal output current of the driver chip is required to be greater than 1.2-1.5A. As the LED light source for lighting, the nominal working current of 1W power LED light source is 350mA, and the nominal working current of 3W power LED light source is 700mA, power Larger ones require more current, so the driver IC selected for LED lighting fixtures must have sufficient current output. When designing the product, the driver IC must work in the best working area of ​​70-90% of the full negative output. Using a driver IC with a full negative output current in the narrow space of the lamp does not dissipate smoothly, which is prone to fatigue and early failure.
3. The output current of the driver chip must be constant for a long time, so that the LED light source can emit light stably and the brightness will not flicker; the same batch of driver chips should be used under the same conditions, and the output current should be as consistent as possible, that is, the dispersion should be small. Production on a large-scale automated production line can be effective and orderly; the drive chip with a certain degree of discrete output current must be selected in the factory or before being put into the production line. Adjust the resistance value of the current setting resistor (Rs) on the PCB to make The constant current driver board for led lamps produced by the company has the same luminous brightness for similar led light sources and maintains the consistency of the final product.
4. The package of the driver chip should be conducive to the rapid heat dissipation of the driver chip die. For example, the die (Die) is directly bound to the copper board, and a pin is directly extended to the outside of the package, so that it can be directly soldered on the copper foil of the PCB board. Quickly conduct heat. For example, on a silicon die similar to 4X4mm, if a current of 300-1000mA is passed for a long time, it will inevitably consume power and will inevitably generate heat. The physical heat dissipation structure of the chip itself is also crucial.
5. The ability of the driver chip itself to resist EMI, noise, and high voltage is also related to whether the entire led lighting product can successfully pass CE, UL and other certifications. Therefore, the driver chip itself must choose an excellent topology and high voltage at the beginning of the design. Production Process.
6. The power consumption of the driver chip itself is required to be less than 0.5W, and the switching frequency is required to be greater than 120Hz to avoid visible flicker due to power frequency interference.
LED green lighting promotes the development of driver chips to innovative designs. LED lamp lighting is inseparable from driver chips, so LED light source driver ICs with multiple functions are required. Non-isolated power supply should be considered when using AC power supply below 36V for led lamps. For example, 220V and 100V AC power supply should be considered for isolated power supply. Direct use of AC100-220V driver chip, because of the demanding application volume, there are still higher technical requirements and greater difficulties. At present, all countries are working hard to develop. The massive demand market for led lamps gives all integrated circuit design companies a chance to succeed again, quickly transform, produce products early, and have many opportunities to win.
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