LED lighting design requires attention to technical details:

    LED lighting fixtures to be leaps and bounds in the near future, LED light source as a green cleaning is widely recognized. Long life LED light source, energy saving, application is simple and convenient to use, low cost, and therefore in the family will receive massive lighting applications, Osram Opto Semiconductors Inc. survey in 2008, global annual shipments of about home lighting lamp 50 billion. LED light source technology matures, the rapid growth of lumens per watt LED, prompting price cuts of its diminishing year by year. To 1W LED light source, for example, the spring of 2008 the price is the price of one-third of the spring of 2006, the spring of 2009 would fall to fourth in 2006. LED green lighting of the mass market and a steady increase in demand will be a few years, following the integrated circuit industry, VCD, DVD, mobile phones, MP3 after the consumer electronics market, the Super Tsunami! LED lamps of high energy, long-life benefits of environmental protection advantages of access to widely recognized.
     High energy-saving LED: DC drive, ultra-low power consumption (single-tube watts 0.03 watts -1) electro-optical power conversion close to 100%, the same energy-saving lighting effects than traditional light sources over 80%.
     LED Long life: LED light source is known as longevity lights. Solid cold light source, epoxy encapsulated, light and no loose parts of the body, there is no filament light easy to burn, thermal deposition, light and fast decline shortcomings, service life of up to 50000-100000 hours, long service life than conventional light sources more than 10 times.
     LED Lee Green: LED is a green light, a better environmental benefits. No ultraviolet and infrared spectra of low in calories and no flicker, no radiation, and waste recycling, no pollution and no mercury elements, cold light source, can be safely touch, typical of the green lighting. Work characteristics of LED light source LED light source lighting VF voltages are very low, the general VF = 2.75-3.8V, IF in the 15-1400mA; so LED driver IC output voltage is VF XN or VF X 1, IF constant in the 15 -- 1400mA. LED lamps use a small-power LED light source (IF = 15-20mA) and high power (IF> 200mA)) are two, low-power LED are usually used to make LED fluorescent lamp, decorative lamps, Grille; high-power LED is used to make home lighting lamps, spotlights, underwater lights, wall wash lights, street lamps, tunnel lights, car lights work. Power LED light source is a low-voltage, high current-driven devices, the luminous intensity of LED current from flowing through the size of the decision, the current too strong can cause attenuation of LED light, the current is too weak will affect the LED's luminous intensity, therefore, LED's Drivers need to provide constant current power supply, in order to ensure the safety of the use of high-power LED, while the desired 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 match, LED lighting advantage can not be reflected. LED lamps for low-voltage driver IC requirements:
     1. Driver IC nominal input voltage range should meet the DC8-40V, to cover the application surface of the needs of voltage greater than 45V if better; AC 12V or 24 V input a simple bridge rectifier output voltage with the grid voltage fluctuations, especially at high voltage output DC voltage will be high, driver IC, such as can not adapt to a wide voltage range, often in the power grid will be higher breakdown voltage, LED light source and therefore were burned.
     2. Driver IC demand is greater than the nominal output current 1.2-1.5A, as the lighting of the LED light source, 1W power LED light source of its nominal operating current of 350mA, 3W power LED light source of its nominal operating current of 700mA, the need for greater power of a large current, so use LED lighting driver IC must have enough current output, designed to make driver IC products must work in at least 70-90% of the negative output of the best work area. Using the full negative output current driver IC cooling small spaces in the poor lighting, easy fatigue and early failure.
     3. Driver IC output current necessary for a long time constant, LED light source to stabilize the LED brightness does not flicker; the same group of driver chips used under the same conditions, the output current of the same size as possible, which is discrete to be small, so that high-volume automated production line to be effective and orderly; for the output current of a certain discrete driver chips must be selected at the factory or production line before the sub-file, adjust the PCB board current setting resistor (Rs) the size of the resistance, so that The production of constant-current LED lamp driver board on the same brightness LED light source in line, maintaining the consistency of the final product.
     4. Driver IC chip, the package should help drive the rapid cooling die, if the die (Die) binds directly to a copper plate on, and there is a direct extension of Pin to package, easy to be soldered directly to PCB board The rapid thermal foil (Figure 1). Such as in a similar 4X4mm of the silicon die, there should be a long time through the 300-1000mA of current, there must be power, is bound to heat, heat dissipation structure of the physical chip itself is also essential.
     5. Driver chip itself is the anti-EMI, noise, resistance to high pressure capacity of the entire LED lighting products can be smoothly passed CE, UL certification, the driver chip itself is designed from the beginning is necessary to choose the topology of the structure and high quality of production processes.
     6. Driver chip's own power requirements of less than 0.5W, switching frequency of requests is greater than 120Hz, so as to avoid frequency interference generated visible flicker. Green Lighting LED Driver IC led to the development of innovative design, LED lighting can not do without driver chip, so the need for multiple functions of the LED light source driver IC. LED lamps use less than 36V AC power supply can be considered non-isolated power supply, such as the selection of 220V and 100V AC power supply should be considered isolated. AC100-220V direct use of the driver chips, due to application of the volume demanding, technically there is higher demand, the greater the difficulty, at present all countries in their efforts to development. Massive demand for LED lighting market to all IC design company once again the chances of success, rapid transformation, as early as a product, and numerous opportunities to win.