what is LED driver?

by:MOSO     2019-12-12
LED driver (LED Driver) refers to the power adjustment electronics that drive LED light or the normal operation of LED module components. Due to the conduction characteristics of the LED PN junction, the voltage and current fluctuation range of the power supply that it can adapt to is very narrow. A slight deviation may not be able to light up the LED or seriously reduce the luminous efficiency, or shorten the service life or even burn the chip. The current commercial 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 optimal voltage or current conditions. ? Since LED applications are used in almost all areas of electronics applications, changes in light intensity, light color, and on-off control are almost unpredictable, so LED drivers have become almost one-to-one servo devices, making this device Family members became diverse. The simplest LED driver (if you can call it like this) may be one or several series-parallel resistance-capacitance components shunting and dividing 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 accurate power adjustment capabilities have been formed. The realization of these solutions usually requires more complicated circuit design, the core of which is the integrated application of LED driver ICs. By setting different support circuits around the LED driver IC, we can build solutions for different LED applications, ranging from mobile phone display backlights and key light drivers to high-power LED street lights and large outdoor LED displays. The more general design and supply of high-power LED drivers are generally undertaken by professional companies. These companies package them into modules and supply them to LED terminal application product manufacturers. The drive design of less common LED terminal application products may need to be designed by yourself. 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 working on the LED driving function, there are other places that can be worked hard. Not much anymore. Due to the unique importance of LED drivers in LED application products and a wide range of user needs, LED driver ICs, which are the heart of LED drivers, have become a key element in the entire technological process. Promote many manufacturers, many of which are listed companies, use LED drivers as their main products to supply a large number of LED driver ICs to downstream industries, such as Hangzhou Silanwei, Shenzhen Quanxin Electronics, Shenzhen Guanghuayuan Technology, Shenzhen State Microelectronics, China Resources Siwei Technology, Taiwan's Dianjing Technology, Accumulation Technology, Guangpeng Technology, Taijing Technology, Feihong, Maoda, Yuanchuang, etc. There are also many American manufacturers with industry-leading styles in this field, such as National Semiconductor, Maxim, Texas Instruments, ON Semiconductor, Linear Technology, Fairchild Semiconductor, and so on. LED drive power is a voltage converter that converts the power supply into a specific voltage and current to drive LED light. Generally, the input of LED drive power includes high-voltage power frequency AC (that is, mains power), low-voltage DC, high-voltage DC, low-voltage high Frequency AC (such as the output of an electronic transformer). The output of the LED driving power is mostly a constant current source that can change the voltage as the forward voltage drop of the LED changes.
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