LED driver refers to the power adjustment electronics that drive LED illumination or LED module components to work properly. Due to the on-characteristics of the LED PN junction, the range of voltage and current variations that can be accommodated is very narrow. A slight deviation may not illuminate the LED or cause a significant decrease in luminous efficiency, or shorten the service life or even burn the chip. Current commercial power supplies and common battery power supplies are not suitable for direct supply to LEDs. LED drivers are electronic components that drive LEDs to operate at optimum voltage or current.
Since LED applications are used in almost every field of electronics applications, changes in luminous intensity, light color, and on-off control are almost unpredictable, so LED drivers become almost one-to-one servo devices, making this device Family members have become diverse. The simplest LED driver (if it can be called this way) may be one or several series-parallel RC components that split the voltage divider in the loop, which is not a separate product at all. For more general commercial applications that require a stable constant current and constant voltage output, a series of system solutions with precise power supply adjustment capabilities are formed. Implementing 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, from mobile phone display backlights and button light drivers, to high-power LED street lights and large outdoor LED displays.
More general-purpose high-power LED driver design and supply, generally by professional companies. These companies supply them to modules and then supply them to LED terminal application manufacturers. Driver designs for less versatile LED terminal applications may require hands-on design. It has become an important part of the unique technical content of this LED terminal application. Because the LED as the packaged product is upstream, its technical performance has been solidified in the LED product, and the unique terminal LED application product is created. In addition to the LED driving function, the light source can be used in other places. It is not much.
Due to the unique importance of LED drivers in LED applications and a wide range of user requirements, LED driver ICs, which are the heart components of LED drivers, have become a key element in the entire technology chain. It has prompted many manufacturers, including many listed companies, to use LED driver as their main product to supply LED driver ICs to downstream industries, such as Hangzhou Silan Micro, Shenzhen Quanxin Electronics, Shenzhen Guanghuayuan Technology, Shenzhen Guowei Electronics, China Resources. Converse Technology, Taiwan's dot crystal technology, accumulation technology, Guangpeng technology, Taiwan crystal technology, Feihong, Maoda, Yuanchuang 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 driving power supply is a voltage converter that converts the power supply into a specific voltage and current to drive the LED to emit light. Usually, the input of the LED driving power source includes high-voltage power frequency alternating current (ie, mains), low-voltage direct current, high-voltage direct current, low voltage high. Frequency communication (such as the output of an electronic transformer). The output of the LED driver is mostly a constant current source that changes the voltage as the LED's forward voltage drop changes.