Expert experience: Correct selection of LED lighting driver chip

In the field of LED lighting, in order to reflect the characteristics of LED lamp energy saving and long life, it is very important to correctly select the LED driver IC. Without the matching of good driver ICs, the advantages of LED lighting cannot be realized.

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 long service life, energy saving, simple and convenient application, low cost of use, so it will be used in a large number of applications in home lighting. According to the survey of OSRAM Optical Semiconductor in 2008, the annual annual sales of home lighting fixtures is about 500. Billions.

The technology of LED light source is becoming more and more mature, and the luminous lumen per watt is growing rapidly, which makes it reduce the price every year. Taking the 1W LED light source as an example, the price in the spring of 2008 is one-third of the price in the spring of 2006, and will fall to a quarter in 2006 in the spring of 2009.

The massive market of LED green lamps and the continuous growth and demand for several years will be the super tsunami in the IC industry after the VCD, DVD, mobile phones and MP3s!

The high performance, long life and environmentally friendly performance of LED lamps are widely recognized.

1. LED high energy saving: DC drive, ultra low power consumption (single tube 0.03~1W) electro-optical power conversion is close to 100%, the same lighting effect is more than 80% energy saving than traditional light source.

2. LED long life: LED light source is called long life light. Solid cold light source, epoxy resin package, there is no loose part in the lamp body, there are no shortcomings such as filament light-emitting, heat deposition, fast light decay, etc. The service life can reach 50,000 to 100,000 hours, which is longer than the traditional light source. More than double.

3. LED environmental protection: LED is a green light source, and the environmental protection benefits are better. There is no ultraviolet and infrared rays in the spectrum, low heat and no stroboscopic, no radiation, and waste can be recycled, no pollution, no mercury, cold light source, safe touch, is a typical green lighting source.

LED light source working characteristics

The VF voltage of the LED light source for illumination is very low, generally 2.75~3.8V, and IF is generally 15~1,400mA. Therefore, the output voltage of the LED driver IC is VFxN or VFx1, and the IF maintains a constant current of 15 to 1,400 mA. The LED light source used in LED lamps has two types of low power (IF is 15~20mA) and high power (IF is more than 200mA). Small power LEDs are often used to make 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. The power LED light source is a low voltage, high current driven device whose luminous intensity is determined by the amount of current flowing through the LED. If the current is too large, the LED light will be attenuated. If the current is too small, the LED's luminous intensity will be affected. Therefore, the LED driver needs to provide a constant current power supply to ensure the safety of the use of high-power LEDs while achieving the desired luminous intensity. In the field of LED lighting, in order to reflect the characteristics of LED lamp energy saving and long life, it is very important to correctly select the LED driver IC. Without the matching of good driver ICs, the advantages of LED lighting cannot be realized.