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LED lighting of the six major technical details

From: Data:14/08/2016

LED light source technology matures, the rapid growth of lumens per watt light, the price is decreasing year by year. To 1Wled light source, for example, the spring of 2008 price is the price of the spring of 2006 1/3, the spring of 2006 will fall to 1/4 in 2009. LED green light mass market and sustained and steady growth in demand for several years will be the integrated circuit industry following the VCD, DVD, mobile phones, MP3 consumer electronics market after the super tsunami!

LED lamp high energy saving, long life, environmental benefits, and the superior performance of obtained generally recognized

LED high energy: DC drive, ultra low power single 0.03 watt - 1 watt) electro-optical power conversion close to 100%. The same lighting effects than the more than 80% energy than traditional light sources. Led long life: LED light source is called longevity lamp. Solid cold light source, epoxy resin package, the lamp body nor loose parts, there is no disadvantages filament burnability, thermal deposition, the light fades quickly. LED

led environmental protection LED is a green light source, a better environmental benefits. There is no ultraviolet and infrared spectra are low in calories and no stroboscopic, no radiation and recyclable waste, no pollution no mercury, cold light source, can safely touch, belongs to the typical green lighting source. LED

light source operating characteristics of illumination with LED light source VF voltage is very low, generally IF, VF=2.75-3.8V in 15-1400mA; so the output voltage of LED driver IC is VFXN or VFX1, IF constant current in 15-1400mA. LED lamp using LED light source with small power (IF=15-20mA) and power (if "200mA) second, small power led to do LED fluorescent lamp, decorative lamp, grille lamp; high power LED used to do home lighting, lamp, underwater lamp, wash wall lamp, lights, tunnel lamp, automobile working lamp. Power LED light source is driven by low voltage and high current device and the luminous intensity is determined by the current size of the flow through the LED, too strong an electric current will cause LED light attenuation, the current weak will affect the LED luminous intensity. Therefore, LED drive the need for constant current power supply, to ensure the high-power led the use of safety, at the same time to achieve the ideal luminous intensity. In the field of LED lighting, to reflect the characteristics of energy saving and long life, choose a good LED driver IC is essential, there is no good driver IC matching, LED lighting can not reflect the advantages. LED lighting design need to pay attention to the technical details of LED lamps and lanterns of low-voltage driving chip: <1. Drive chip nominal input voltage range shall satisfy the DC8-40V, to cover the surface of the application need and pressure can be better than 45V; AC12V or 24V input simple bridge rectifier output voltage will with the voltage fluctuations, especially high voltage when the output DC voltage will be high, the driver IC such as can not adapt to the wide voltage range, often when the grid voltage increases will be breakdown, LED light source has therefore been burned.

2. Drive chip nominal output current is required more than 1.2-1.5A, LED light source for lighting, 1W power LED light source with its nominal operating current of 350mA, Power 3W LED light source the nominal operating current of 700mA. High power needs more current, therefore led lights with the selection of driver IC must have sufficient output current, product design must drive IC operating at the optimal working zone of 70-90% of full load output. Use of full negative output current drive IC in the narrow space of the lamp heat dissipation, easy fatigue and early failure.

3. Drive chip output current must be constant for a long time, LED light source can be stable luminescence, brightness will not blink; with a number of driver chip used in the same conditions, the size of the output current is to be as consistent as possible, is discrete to small, so in batch automatic production line to produce efficient and orderly; the current output have certain discrete driving chip required in front of the factory or put into production line tranches, adjust the PCB plate current setting resistor (RS) the resistance size, enable the production of LED lamp constant current driver board to the same kind of LED light source brightness consistent, maintain the consistency of the final product. <4. Drive chip package should be conducive to the driver IC tube core of rapid heat dissipation, such as the tube core (die) by directly binding in copper, and a pin direct extension to the outside of the package, facilitate directly welded on the PCB copper foil fast heat (Figure 1). Such as in a similar 4X4mm silicon wafer, to a long time through the 300-1000mA of the current, there is bound to have power consumption, will inevitably heat, the chip itself is also essential to the physical cooling structure.

5. Drive chip anti EMI, noise, high pressure is also related to whether the LED lamp products passed the CE, UL certification, so that the drive chip itself at the beginning of the design to choose excellent topological structure and high production technology.

6 driver chip power requirements are less than 0.5W, the switching frequency is greater than 120Hz, so as to avoid power frequency interference and produce visible flicker. Led green lighting to promote the development of the driving chip design and development, LED lighting is inseparable from the driver chip, so the need for a variety of functions LED light source IC. LED lamp selection of 36V AC power supply can consider non isolated power supply, such as the use of 220V and 100V AC power supply should consider the isolation of power supply. Direct use of AC100-220V driver chip, due to the application of the volume of demanding, in the technical requirements of higher, more difficult, the current efforts are in the development of. Massive demand market led lamp to give a chance to all IC design companies to succeed again, rapid transformation, early products, the chances of winning a lot.