In the field of 200W led floodlighting, to embody the led Lantern Festival and the features of long life, correct selection of the led driver IC is very important. Without a good driver IC matching, the advantages of 200W led floodlighting cannot be reflected. So when choosing the led driver IC, should pay attention to what performance index and method of use?
200W led floodlighting lamps and lanterns in the near future for the development of the leap, LED as the cleanness of green environmental protection light source widely recognized. 200W led Flood light source with long service life, energy saving province electricity, simple application, use cost low, thus lighting in the family will receive the application of mass, osram optical semiconductor company survey in 2008, the global family lighting lamp holder rate of about 50 billion a year.
200W led Flood light source technology matures, each tile shine lumens rapid growth, its decreasing year by year. With 1 w 200W led Flood light source as an example, the spring of 2008, the price is the price of the spring of 2006, a third in the spring of 2009 will be reduced to a quarter of 2006.
Green 200W led floodlights and lanterns of the mass market and the number of steady growth in demand will be integrated circuit industry after the VCD, DVD, mobile phones, MP3 players in the consumer electronics market in the tsunami!
200W led floodlights and lanterns of high energy saving, long life, the performance of environmental protection has generally recognized.
1. LED high energy saving: dc drive, low power consumption (single pipe 0.03 ~ 1 w) lightning power conversion is close to 100%, the same effect is better than traditional lighting energy saving more than 80%.
2. Long life LED, 200W led Flood light source is called the long light. Solid cold light source, epoxy encapsulation, light body and no loose parts, there is no filament light is burning, heat, light failure quickly, such as faults, the service life can reach 50000 to 100000 hours, up to 10 times than the traditional light source long life.
3. LED the environmental protection, the LED is a kind of green light source, environmental benefits is better. No ultraviolet and infrared spectrum, quantity of heat low and no stroboscopic, no radiation, and the waste can be recycled, there is no pollution does not contain mercury element, cold light source, is safe to touch, belongs to the typical green lighting light source. 200W led Flood light source working characteristics
Lighting of the 200W led Flood light source VF voltage is very low, under normal circumstances is 2.75 ~ 3.8 V, IF the average of 15 ~ 1400 mA. Therefore, the output voltage of the LED driver IC is VFxN or VFx1, IF keep constant current in the 15 ~ 1400 mA. 200W led floodlights and lanterns use 200W led Flood light source has small power (IF for 15 to 20 ma) and power (IF more than 200 ma) two. Small power LED more than used for making the LED fluorescent lamp, lamp, grille lamp. High power LED is used to make family lights, lights, underwater lights, wall wash light, street light and tunnel lights, automobile work lights, etc. Power 200W led Flood light source is low voltage, high current drive device, the luminous intensity is determined by the size of the current through the LED. Current will cause 200W led Flood light attenuation, had second thoughts affect the luminous intensity of LED. Therefore, need to provide constant current power supply, LED driver to ensure the security of high power LED using, at the same time to achieve the ideal of the luminous intensity. In the field of 200W led floodlighting, to embody the LED Lantern Festival and the features of long life, correct selection of the LED driver IC is very important. Without a good driver IC matching, the advantages of 200W led floodlighting cannot be reflected.
The requirements of the 200W led floodlights and lanterns of low voltage driver chip
1. The driver chip of nominal input voltage range shall meet the dc 8 ~ 40 v, to cover a wide application needs. Compression ability better than 45 v. When the input for ac 12 V or 24 V, simple bridge rectifier output voltage with power grid voltage fluctuation, especially when the voltage is high, the output voltage will be on the high side. If driver IC is not wide input voltage range, will often in the grid voltage will be breakdown, and burned the 200W led Flood light source.
2. Driver chip the nominal output current requirements of more than 1.2 ~ 1.5 A. As lighting of the 200W led Flood light source, the nominal working current of the 1 w power 200W led Flood light source for 350 ma lighting applications, the nominal working current of 3 w power 200W led Flood light source for 700 ma lighting applications. High power 200W led Flood light source needs more current, so the 200W led floodlighting lamps and lanterns chooses the driver IC must have enough current output, design products must also be driving IC work in full load output of 70 ~ 90% of optimal working area. Use full load current output driver IC in the lamps and lanterns narrow space heat dissipation, easy to cause the lamps and lanterns and early fatigue failure occurred.
3. Drive the output current of the chip must be kept constant, so the LED can stable, won't shine. With a batch of driver chip used under the same conditions, the output current size to be as consistent as possible, which is discrete, so when mass production automation production line to ensure effective and orderly. Have certain discrete of output current for the driver chip, will choose in the factory or before put into production line to divide to choose, adjust the resistance of the current setting resistance on PCB size, so that the production of 200W led floodlights and constant current driver wants similar 200W led Flood light source the light brightness, in order to keep the consistency of the final product.
4. Drive chip package should be conducive to drive chip tube core of rapid cooling, such as the bare chip directly binding on copper, and there is a pin directly to package, so that the welding on the PCB of the copper foil directly rapid thermal conductivity (figure). If the similar 4 x4mm chip to 300 ~ 1000 mA current through a long time, you must produce power consumption and fever, therefore, of the chip itself physical cooling structure is also very important.
5. Driver chip resistance EMI noise, and the ability of resistance to high pressure also is related to the 200W led floodlights products can smoothly through the CE, UL, etc, so be about to choose in the design of the drive chip the topology structure and high pressure of advanced production technology.
6. The driver chip itself power consumption demand is less than 0.5 W, the switch working frequency for more than 120 hz ac, lest produce a visible flicker frequency interference.
In a word, LED green lighting LED drive chip to innovative design development. 200W led floodlights and lighting without driver chip, so need to multifunctional LED driver IC. If the 200W led floodlights and lanterns chooses below 36 v ac power, can consider not isolated power supply; If choose 220 v and 100 v ac power, should consider to isolated power supply. Direct use of 100 ~ 220 v ac drive chip, because of the demanding requirements of the application to volume, and there be higher technical requirements, the more difficult, the current development of the countries are trying to. 200W led floodlights and lanterns of the huge market demand for all integrated circuit design company again the chance of success, if you can rapid transformation, the early products, is a lot of chance of winning.