LED applications and LED driven IC technology market analysis

LED is widely recognized as a green and clean light source. LED, long service life, energy saving, easy to use, low cost, and thus in the mobile phone, MP3, MP4, PMP, DSC (digital camera), LCD backlight, GPS PND, PDA handheld products, game machine, machine learning, such as notebook computer; LED flashlight, portable lamp lighting; lighting in architectural lighting, decorative lighting and Signage; in the instrument | dashboard backlight, front and rear fog lamps, third car lights, brake lights, taillights and direction; application in home lighting will be massive.

LED drive IC current market demand

LED IC drive current market demand by application to the basic three categories, one is for consumer electronic products, its application is powered by batteries, so it is generally 4.2-8.4V, low voltage and low current LED drive is the large volume of products; two is used for car lighting products. Because of the power | regulator from the car battery, is generally 48V, so the need for higher voltage step-down LED driver IC; three is the architectural decoration lighting and home lighting, you will need the AC can be directly converted into DC LED driver IC, the main function is to convert the alternating current voltage for constant current power supply, and at the same time to complete, and LED the voltage and current. Thus different applications of the LED driver IC are completely different.

LED drives for consumer electronics have proven technology, products and relatively mature markets. 2007 global mobile phone market driven by IC up to 600 million LED, will continue to grow in 2008.

Automotive lighting products, such as the use of a large number of LED, most of them are series, parallel drive, the need for higher voltage, for the power of the battery from the 48V car is very convenient. At present, the ability to 60V high voltage LED drive new products have been introduced. Thus in front of the automotive market directly using LED dashboard backlight, front and rear fog lights, third brake lights, direction lights, taillights market is very optimistic and optimistic.

Architectural lighting and home lighting, the need for the AC can be directly converted into DC constant current source LED driver IC, can not provide a single SOC integrated circuit products, most of the module circuit. Architectural lighting has been widely used in major cities in china. The society needs to the home LED lighting lamp will be an astronomical figure, but the current home LED lighting technology and production costs from mass production still have a certain distance, still need to work hard.

Consumer electronics commonly used LED driver IC

Consumer electronics LCD screen backlight is generally 2-8 LED lamps, parallel or single power supply applications are. Since 2000, consumer electronics commonly used LED drive IC has DC/DC switching regulator (Boost), charge pump (ChargePump), constant current source (Constant) and low dropout voltage regulator (LDO).

DC/DC switching regulator is used to store the energy of the inductor, and the inductor is easy to launch the switching frequency, easy to radio frequency (RF) of the new interference, so in the mobile phone products used less. Charge pump is also a kind of switching regulator, but it is the use of capacitors for energy storage, and therefore will not launch the switching frequency, the largest share of the mobile phone products. LED light-emitting IF constant current, constant current source is designed and manufactured for this market, the constant current source is 50% of the price of the charge pump, which in recent years in the popularity of mobile phone products also occupy a certain share. The popularity of mobile phone products demanding cost down, mobile phone backlight driving unit can drive LED oil is to reduce the cost of IC, the majority of mobile phone shutdown voltage design to 3.3V in the battery voltage, the constant current source is designed to output 20-30mA at 4.2V-3.3V 3.3V with constant current, the output current. The charge pump is selling efficiency (ETA), but most of the charge pump in the 4.2V-3.3V when the conversion efficiency is not high, when the battery voltage drops to 3.0V-2.5V and its conversion efficiency can reach 85-90%, but at present most of the mobile phone can not plan and exert its advantages. LDO is a very good performance of the low dropout voltage regulator, the output voltage is stable, when the load is constant, it flows through the load current is constant, based on the principle of LDO is also a good LED driver. The mobile phone with LED driver IC, a DC/DC (Boost) the price is USD0.12-0.15, a charge pump price is USD0.20-0.25, 0.09-0.12 is a constant current source price, a $LDO only a bit, to reduce the cost of mobile phone backlight driving unit, there is a certain space, this year a lot of popularity type of mobile phone has been selected. In addition to the LED mobile phone screen backlight keyboard backlight driver IC, mobile phone, mobile phone camera flash also need LED driver IC. It is characterized by low voltage, low current, because the battery is energy.

RF part of the consumer electronics LCD backlight drive can choose DC/DC switching regulator, LED is generally used in series +N parallel connection, the operating voltage is slightly higher, the working current is smaller than the N. Multiple LED series parallel can be used as a larger LCD screen backlight, such as figure 3LCD electronic light box. In addition, there are such as LED flashlight.

The choice of mobile handheld display product backlight LED driver IC

Mobile handheld display backlight LED driver IC product selection, according to the area of the LCD to set the number of LED point light source; according to the LED N on N and lit the way to choose the different working principle, different output capacity of the LED driver IC; 1.8 inches ~3.5 inch LCM mobile phone with the LED light source is 2-4 LED 3.5 inches ~8.0 inches; MP3/MP4/PDP/GPS/PND/DPF LCM of the LED light source is 6-28 LED; 12.1 inch ~15.4 inch notebook computer with the LCM LED point light source is 48-60-72 LED; hand