Decomposition: LED lighting power supply requirements for low voltage driver IC

LED lighting has been rapidly developed in the near future, and LED has been widely recognized as a clean and clean light source. LED light source has the advantages of long service life, energy saving, simple and convenient application, low cost of use, etc., so it will be used in the future in home lighting. According to the data of OFweek Semiconductor Lighting Network, the output value of China's LED lighting industry exceeds 150 billion yuan at present. The current LED lighting scale accounts for 70% of the national market. Last year, the LED industry in Guangdong Province achieved a total industrial output value of 85.3 billion yuan. Some professionals predict that the fastest in 2015, LED lighting in the Chinese lighting market will reach 20%, driving the industry scale will reach 500 billion yuan, when China will enter the top three global LED lighting market.

The LED light source used in LED lamps has two types of low power (IF=15-20mA) and high power (IF>200mA). The low-power LEDs are mostly used for LED fluorescent lamps , decorative lamps and grille lamps; high-power LEDs are used for Home lighting, spotlights, underwater lights, wall washers, street lights, tunnel lights, car work lights, etc. Among them, the high-power LED light source is a low-voltage, high-current driving device. The intensity of the light is determined by the current flowing through the LED. If the current is too strong, the LED light will be attenuated. If the current is too weak, the LED's luminous intensity will be affected.

In general, the VF voltage of the LED light source for illumination is very low, generally VF = 2.75-3.8V, IF is 15-1400mA; therefore, the output voltage of the LED driver IC is VF XN or VF X 1, IF constant current is 15-15 1400mA.

In summary, the LED driver needs to provide a constant current power supply to ensure the safety of high-power LEDs and achieve the desired luminous intensity. In the field of LED lighting, to reflect the characteristics of energy saving and long life, it is important to choose a good LED driver IC. Without the matching of a good driver IC, the advantages of LED lighting cannot be reflected.

Now, due to the needs of the LED green lighting market, LED lighting power supply driver chips are being developed into innovative designs. The massive demand market for LED lamps has given all IC design companies a chance to make a big impact.

Everyone knows that LED lighting power supply is inseparable from the driver chip, so it needs a variety of functions of LED light source driver IC. LED lamps use AC power below 36V to consider non-isolated power supply. For example, 220V and 100V AC power should be considered for isolated power supply. As for the direct use of the AC100-220V driver chip, due to the demanding application, there are higher technical requirements and greater difficulty in the technology. At present, countries are working hard to develop.

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