LED Driver refers to the power adjustment electronic device that drives LED to emit light or LED module components work normally. Due to the conduction characteristics of the LED PN junction, the voltage and current range of the power supply it can adapt to is very narrow, and a slight deviation may not be able to light the LED or severely reduce the luminous efficiency, or shorten the service life or even burn the chip. The current industrial frequency power supply and common battery power supply are not suitable for directly supplying LEDs. LED drivers are such electronic components that can drive LEDs to work under the optimal voltage or current state.
Since LED applications are almost in every field of electronics applications, the changes in its luminous intensity, light color, and on-off control are almost unpredictable, so the LED driver has become almost a one-to-one servo device, making this device The family members became diverse. The simplest LED driver (if you can call it that way) may be one or several series-parallel resistor-capacitor components that divide the current and divide the voltage in the loop. It is not an independent product at all. For more common commercial applications that require stable constant current and constant voltage output, a series of system solutions with precise power adjustment capabilities have been formed. Realizing these solutions usually requires a more complex circuit design, the core of which is the integrated application of LED driver ICs. By setting up different support circuits on the periphery of the LED driver IC, we can build solutions for different LED applications, ranging from mobile phone display backlighting and button lighting drivers to high-power LED street lights and large outdoor LED displays.
The design and supply of more general high-power LED drivers are generally undertaken by professional companies. These companies will repackage them into modules and supply them to LED end application product manufacturers. The driver design of the less general LED terminal application products may need to be designed by oneself. It has become an important part of the unique technical content of this LED terminal application product. Because the LED as a package product is upstream, its technical performance has been solidified in the LED product, and to create a unique terminal LED application product, for the light source, in addition to the LED driving function, there are other areas that can be worked hard. Not much anymore.
Due to the unique importance of LED drivers in LED application products and wide range of user needs, LED driver ICs, which are the heart of LED drivers, have become a key element in the entire technical link. Encourage many manufacturers, many of which are listed companies, to use LED drivers as their main products to supply large amounts of LED driver ICs to downstream industries, such as Hangzhou Silan Microelectronics, Shenzhen Quanxin Electronics, Shenzhen Guanghuayuan Technology, Shenzhen Guowei Electronics, China Resources Silicon Granville, Taiwan's Dianjing Technology, Macroblock Technology, Guangpeng Technology, Taijing Technology, Feihong, Mota, Yontron and so on. There are also many American manufacturers with industry leaders in this field, such as National Semiconductor, Maxim, Texas Instruments, ON Semiconductor, Linear Technology, Fairchild Semiconductor and so on.
The LED drive power supply is a voltage converter that converts the power supply into a specific voltage and current to drive the LED to emit light. Under normal circumstances: the input of the LED drive power includes high-voltage power frequency AC (ie city power), low-voltage DC, high-voltage DC, low-voltage and high-voltage Frequency AC (such as the output of an electronic transformer), etc. The output of the LED driving power supply is mostly a constant current source that can change the voltage with the change of the forward voltage drop of the LED.