LED lighting power supply for low voltage driver IC technical requirements - (AddTime ： 2013-01-28)

LED lighting lamps and lanterns in the near future for the development of the leap, LED as green clean source widely recognized. LED light source with long service life, energy saving save electricity, the application is simple and convenient, using low cost advantage, so the family lighting in the future will have the magnitude of the application. According to OFweek semiconductor lighting network data show that the present stage our country led lighting industry output value of more than 150 billion yuan; Guangdong at present, the LED lighting scale accounts for the 70% of the market, guangdong province last year LED industry to realize gross industrial output value is 85.3 billion yuan. Have professional expected, fastest in 2015, LED lighting in China lighting market share will reach 20%, to promote industrial scale will reach RMB 500 billion, at that time, our country will enter the global LED lighting market big before.

200W led Flood light and lanterns use LED light source have little power (IF = 15 - and ma) and high power (IF > 200 ma) two kinds, small power LED to do LED fluorescent lamp, fancy lamp, grille lamp; High power LED is used to do my light, shoot the light, underwater lamp, wash wall lamp, street light, tunnel light, automobile work light, etc. The high power LED light source is low voltage, high current drive device, the luminous intensity LED by through the current size decision, the current will cause a strong LED light attenuation, current too weakly affect LED the luminous intensity.

And usually lighting LED light source VF voltage is very low, general VF = 2.75 3.8 V, IF in the 15-1400 ma; So the LED driver IC output voltage is VF X N or VF X 1, IF constant current in the 15-1400 ma.

To sum up, the LED driver needs to provide constant current power supply, in order to ensure the safety of high power LED use, at the same time to achieve the ideal luminous intensity. In LED lighting field, to reflect the characteristics of energy saving and long life, choose good LED driver IC is very important, no good driver IC matching, LED lighting advantage cannot reflect.

Now because of the LED green lighting the needs of the market, make LED lighting power driver chip to the innovative design development, 200W led Flood light and lanterns of the mass market demand to all integrated circuit design company again it into opportunities.

Everyone knows that 200W led Flood light and lanterns lighting power source is from drive chip, and therefore need a variety of functions of the LED light source driver IC. 200W led Flood light and lanterns chooses 36 v ac power source can consider not isolation power supply, if choose 220 v and 100 v ac power should consider isolation power supply. As for direct use AC100-220 v driver chip, for application volume, demanding in technology have a higher request, the more difficult it is, the present various countries are trying to developing.

LED lighting lamps and lanterns of low power drive chip requirements, specific as follows:

1. Drive chip nominal input voltage range shall meet the DC8 - v, to cover the application needs, such as pressure can more than 45 v is better; AC 12 v and 24 v input simple bridge rectifier output voltage with power grid voltage fluctuation, especially when high voltage output dc voltage will also be on the high side, drive IC if you can not adapt to the wide voltage range, often in the grid voltage rise will be breakdown, LED light source and therefore was burned down. 2. Drive chip nominal output current demand greater than 1.2-1.5 A, as A lighting LED light source, 1 w power LED light source its nominal working current for 350 ma, 3 w power LED light source its nominal working current for 700 ma, big power needs more current, so the LED lighting lamps and lanterns chooses driver IC must have enough current output, design products must make driver IC work in full load output of 70-90% of the best work area. Use full load output current driver IC in the lamps and lanterns of narrow space cooling impeded, fatigue and early failure.
3. Drive chip output current must long constant, LED light source can stable luminous, brightness will not flicker; The same driver chip used in the same conditions, the output current size should be consistent, namely discrete to small, so in the mass production of automatic production line to be effective and orderly; For the output current have certain discreteness driver chip will choose in the factory or input line before step, adjust the PCB board current setting resistance (Rs) resistance of the size, the production of 200W led Flood light and lanterns constant current drive for suppressing the similar LED light source luminous intensity is consistent, maintain the consistency of the final product.
4. Drive chip package should be advantageous to drive chip tube core rapid heat dissipation, such as tube core (Die) direct binding in the copper plate, and a Pin direct extended to package outside, facilitate direct welding in the PCB board of copper foil quickly on the thermal conductivity. As in a similar 4 x4mm silicon tube core, long time through the 300-1000 ma, the current must have power, inevitable meeting fever, chip itself physical cooling structure is also very important.
5. Drive chip itself resistance EMI, noise, high pressure resistance ability but also related to the LED lighting products can be successfully through the CE, UL authentication, etc, so drive chip itself at the beginning of the design to choose good topology structure and high production technology.
6. Drive chip for their own consumption less than 0.5 W, switch work more than 120 hz frequency requirements, in order to avoid the power frequency interference and produce visible flicker.