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From the current domestic market, the application of LED driver ICs mainly focuses on LED lighting, LED driving power, LED large-screen display and backlighting of mobile phones, televisions, notebook computers, game consoles, tablet computers, GPS, digital cameras.
According to statistics from the High-tech LED Research Institute, there are a large number of LED driver ICs in China that develop power supply driver ICs mainly in Europe, America, Japan and Taiwan. From the technical point of view, domestic ICs can basically meet market needs, but Insufficient innovation, only to follow the pace of improvement of international manufacturers. There are about 50 design companies. After visiting the reporter, I found that only Lilijie, Jingfeng Mingyuan, MPS, OB, Megumi, and BCD occupy a certain market scale, and most of them are concentrated in the field of LED lighting ICs.
"The manufacturers of power supply ICs are mainly concentrated in Europe and the United States. The Japanese and Taiwanese manufacturers subsequently joined. The domestic power IC manufacturers started late, and most of the products have lower technical content and lower grades." Professor Yan Chongguang, a domestic IC industry expert According to the development of IC chips, LED driver IC design companies need to invest a large amount of chip design fees, plate making, tape-out, packaging, and testing costs. The early development cost of each chip is high, and it can only be used in large quantities. Amortize development costs and reduce production costs.
The current reality is that, due to chip compatibility issues, once a chip is selected into its production plan by a certain LED lighting product, after passing the certification, it is difficult for other manufacturers' chips to enter its supply chain unless it is Chip pins are compatible at the same quality, and the price is at least 20% lower than the previous one.
Due to the early development of LED large screen, Taiwan's accumulation technology LED large-screen driver IC is the first to reach the market, and the market share of LED large-screen market is 70-80%. The LED large-screen driver module using accumulation driver IC is very mature, reliable quality and performance. Stable and competitive. The driver IC of the large-screen display has almost become a position of Taiwanese manufacturers. Only Shilanwei has a small market share in China.
In the TV and mobile phone backlight power IC market, the sales of domestic IC manufacturers are even more bleak. The main reason is that the color TV and mobile phone brands sold in China are mainly European, American and Japanese brands. These companies have already had relatively stable international IC suppliers. .
From a technical point of view, the technical level of domestic LED driver ICs has been able to basically meet market needs. After years of polishing, most of their technical indicators can compete with international IC manufacturers. However, due to lack of innovation, it is still necessary to further follow the international major to complete its own technology upgrade.
How to improve the price
According to Lin Zhiyan, technical marketing manager of ON Semiconductor's lighting market, IC currently faces three major problems of heat dissipation, size and compatibility. Since the LED chip itself generates heat, the overall temperature of the LED is high and the heat energy consumption is increased, which requires the driver IC to improve energy efficiency and reduce the heat dissipation problem of the LED driving power source itself. To solve the size problem, it is necessary to improve the integration of the driver IC, such as integrated MOSFET and some peripheral control circuits, thereby reducing the overall size of the LED driver circuit.
As a high-precision device, the driver IC pursues high constant current accuracy, including IC linearity adjustment, load regulation, temperature effects, and batch consistency. At the same time, wafer production is required to use a high-voltage process to improve the withstand voltage performance of the IC, and it can be used for high-voltage startup to simplify application circuits. Wang Dong, Senior Product Manager of Silan Micro Power and Power Drive Product Line, said that IC as a refined high-tech product requires a lot of research and development costs, but this is not the case. Many IC-free design capabilities. The power IC copying workshop has also joined the development of the "copy army" of LED driver ICs.
“The LED driver IC does not require other ICs to cut micro-nano lines on the wafer. As long as there is a finished product, the imitation is very simple, which also gives the “high imitation IC†manufacturers more chances of plagiarism.†Shenzhen Wonengda Technology Co., Ltd. Chief Engineer He Shuguang said that in such a large environment of plagiarism, the technological advantages of foreign manufacturers are becoming weaker. The reporter visited several foreign IC manufacturers. They said that “clones†often cut prices by 20% first, and then hit the market with low quality. The end result is that the price is too low, and the original products cannot be sold.
Hu Liqiang, general manager of Shanghai Jingfeng Mingyuan Semiconductor Co., Ltd. believes that in terms of LED driver ICs, it is important to improve the cost performance of the entire driver power supply, especially the design and wiring costs brought by the peripheral design of the IC. According to reports, to improve the cost performance of LED drive power, the key is how to reduce the material cost, processing cost and improve the production yield of LED drive power. For example, Jingfeng Mingyuan 1~5W isolated drive power supply IC BP3122, in the economical application circuit, only 11 peripheral components, using PSR control (primary feedback control), the transformer is reduced from 3 windings to 2 windings.
According to the reporter's understanding, the current price of capacitors, resistors, diodes and other devices has been very stable, there will be no more room for price cuts. On the contrary, if the components are reduced, the price may rise. According to He Shuguang, in order to reduce costs, IC application circuit designers have racked their brains to reduce the number of fuses, resistors, capacitors, diodes and integrated circuits used in them by designing circuits, even if only one component is reduced. Dime, your advantage will be very obvious in the same program.
Yan Chongguang said that if some functions can be added to the IC, the application circuit may save a lot of components and save the production cost of the power board. The simplification of the peripheral circuit makes the drive power board have more space for heat dissipation and EMC in the narrow space inside the LED lamp.
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For more details, please refer to the August issue of "High-tech LED-Technology and Applications"
The "market dream" of domestic driver IC
[Source: "High-tech LED - Technology and Applications" August issue Long Zonghui]