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How to correctly choose LED driver IC

Writer:www.turnmax-tech.comSource:东莞市腾茂电子有限公司 Date:2016-10-28

In the field of LED lighting, LED to reflect the Lantern Festival and the characteristics of long life, the right choice of LED driver IC is crucial. Without a good driver IC match, the advantages of LED lighting cannot be reflected. So when choosing the LED driver IC, which performance index and method of use should pay attention to?

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LED lamps and lanterns of high energy saving, long life, the universally acknowledged the superior performance of environmental protection:
1, LED energy saving, high dc drive, ultra-low power consumption (single tube 0.03 ~ 1 w) electric power conversion is close to 100%, the same lighting effect than the traditional light source, energy saving more than 80%.
2, LED long life: LED light source is called longevity lamp. Solid cold light source, the epoxy resin encapsulation, no loose parts in the body, there is no filament light easy to burn and fast thermal deposition, droop shortcomings, service life can reach 50000 to 50000 hours, long service life 10 times more than traditional light.
3, LED, environmental protection, LED is a kind of green light source, better environmental benefits. No ultraviolet and infrared spectrum, the quantity of heat low and no stroboscopic, no radiation, and waste recycling, no pollution contains no mercury elements, cold light source, can safely touch, belongs to typical green lighting source.
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LED light source characteristics:
Lighting of the LED light source VF voltage is very low, usually is 2.75 ~ 3.8 V, IF the general is 15 ~ 1400 mA. Therefore, the LED driver IC output voltage is VFxN or VFx1, IF keep constant current in 15 ~ 1400 ma.
LED lamps using LED light source with low power (IF for 15 ~ 20 ma) and high power (IF more than 200 ma) two kinds. Small power LED is much used for production of LED fluorescent lamp, decoration lamp, grille lamp. High power LED is used to do my lights, lamp, underwater light, wash wall lamp, street light, tunnel lamp, automobile work light, etc.
Power LED light source is driven low voltage, large current device, its luminous intensity is determined by the size of the current through the LED. Current will cause LED light attenuation, current starts to affect the LED luminous intensity. Therefore, the LED driver needs to provide constant current power supply, to ensure the safety of high power LED use, at the same time to achieve the ideal of luminous intensity. In the field of LED lighting, LED to reflect the Lantern Festival and the characteristics of long life, the right choice of LED driver IC is crucial. Without a good driver IC match, the advantages of LED lighting cannot be reflected.
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LED lamps and lanterns of low voltage driver chip requirements:
1, driving chip of the nominal input voltage range of dc shall be 8 to 40 v, to cover wide application needs. Best compression capacity greater than 45 v. When the input is ac 12 v or 24 v, simple bridge rectifier output voltage can follow the grid voltage fluctuation, especially when the high voltage output dc voltage will be on the high side. If the driver IC is not wide input voltage range, will often would be breakdown voltage rise in power grid, which burned LED light source.
2, drive chip is greater than 1.2 ~ 1.5 A nominal output current requirements. As the lighting of LED light source, 1 w power LED light source of nominal working current is 350 ma, the nominal working current of 3 w power LED light source for 700 ma. Large power LED light source, need more current, so the LED illumination lamps and lanterns of driver IC must have enough current output, design products must also be driving IC working at full capacity, the output of 70 ~ 90% of the best work area. Use full output current of driver IC in the narrow space of lamps and lanterns poor heat dissipation, easy to cause the lamps and lanterns in fatigue and early failure.
3, driving chip output current must remain constant, this LED to stability, not flicker. The same driver chip used in the same condition, the output current size to be as consistent as possible, which is discrete, when the mass production automation production line so to ensure effective and orderly. For discrete driver chip output current to a certain extent, will choose to step in front of the factory or production line, to adjust the resistance current setting resistance on PCB board, make the production of LED lamps and lanterns of constant current drive threatening the same luminous brightness of the LED light source is consistent, to maintain the consistency of the final product.
4, drive chip packaging should be conducive to drive the rapid cooling tube core chip, such as the bare chip directly binding on copper plate, and there is a pin directly extends to the outside of the package, so that the welding on the PCB board of the copper foil directly fast heat conduction. If is similar in 4 x4mm chip to for a long time by 300 ~ 1000 mA current, is inevitably produce power consumption and fever, therefore, the physical structure of the heat dissipation of chip itself is very important.
5, drive chip EMI resistance, noise, and the ability of resistance to high pressure is related to the LED lighting products can pass the CE, UL certification, so when designing driver chip is advanced topology structure and high production process.
6, driving chip itself is less than 0.5 W power consumption requirement, switch working frequency requirement is more than 120 hz, lest produce a visible flicker frequency interference. In a word, LED green lighting LED driver chip to the innovation design development. LED lighting lamps and lanterns without driver chip, so you need to LED light source driver IC. If the LED lamps and lanterns chooses under 36 v ac power, can consider the isolated power supply; If use 220 v and 100 v ac power, should consider to isolated power supply. Direct use of ac 100 ~ 220 v driver chip, for application to the demanding requirement of the volume, and higher demands on technology, greater difficulty, in the countries are working to develop at present. Voracious demand market of LED lamps and lanterns to all IC design company's chances of success again, if can rapid transformation, the product early, the chance of winning.

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