[Text / high-tech LED Gan Qin] In recent years, LED driver ICs have experienced a large and bulky isolated IC from the initial volume, to a smaller and more efficient non-isolated IC, and now simple and efficient, application cost Low cost linear IC.
As early as a few years ago, IC companies represented by Ming Microelectronics have already introduced linear IC solutions. However, due to factors such as concept, application environment, market and price, linear ICs have not been popularized. Previously, the industry defined linear IC as a misconception that was limited to the low-end and low-power markets, which led to its unsatisfactory promotion effect.
At present, as the market becomes more open, the industry is beginning to reconsider linear ICs. Due to its simpler scheme and fewer peripheral components, its solution integration and reliability are higher, and it is widely used in the domestic market. In addition, because it is easier to be certified, it is very conducive to the promotion of foreign markets, especially the stable grid in Europe and America. Wait for the high-end market.
"Linear IC can be applied not only to low-power products, but also to high-power products, such as street lamps, mining lamps, floodlights, etc., using linear constant current schemes, multiple parallels, power can reach several hundred watts or even kilowatts. , more cost-effective advantage." Ming Micro Electronics Marketing Director Zhao Chunbo said.
Take the SM2212/3E linear solution introduced by Ming Microelectronics as an example. The product does not need to change the original lighting line, and the operation is simple and easy. Zhao Chunbo said that linear ICs are easy to produce and more compact, and their reliability will be improved accordingly. At the same time, they can be protected from high temperature and low temperature, and can support intelligent lighting applications.
"For merchants and manufacturers, the linear solution system has a simple structure, few external components, low cost, easy to produce and easy to control quality." Yu Chengqiang, chairman of Yacheng Micro, said that after several years of development, maturity of linear IC It has been thoroughly tested by the market and has been unanimously recognized.
Yu Yuanqiang takes the RM9001E 7W downlight scheme introduced by the company as an example. The product uses a high-precision linear constant current LED driver chip to drive three high-voltage LED strings through a built-in MOS transistor. Since no electrolytic capacitors and magnetic components are required, the LED driver can be realized. Small size, long life and compliance with EMI regulations.
"In order to improve the reliability of the chip operation, we adopt an over-temperature regulation design. When the drive power supply overheats, the output current is gradually reduced, thereby controlling the output current and temperature rise, and the power supply temperature is maintained at a set value to increase the system reliability. The internal temperature regulation temperature of the chip is 130 °C." Yu Yuanqiang said.
It is understood that domestic markets, including Mulinsen, Op Lighting and NVC Lighting, have already launched linear constant current solutions, while solar lighting linear solutions are available in foreign markets.
In addition, Zhao Chunbo corrected the phenomenon that some people used the linear IC to equate with the “de-power†phenomenon of the earlier hot speculation. He said that the linear IC cannot be completely equivalent to the “de-power supply†because the linear IC can become independent. A power module can also be designed as a module without power.
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