With the continuous improvement of LED light source technology, the price of terminal lamps has shown a rapid downward trend. Taking LED bulbs that can replace 60W incandescent lamps as an example, the retail price in 2010 was $ 40, but this year the price has dropped to $ 10. With the strengthening of the popularity of LED lighting by the Chinese government, it is expected that the global LED lighting market will gradually pick up in 2013, and the price will enter a new round of downward adjustments. about. Considering that the next two years will be a crucial period for the LED lighting market, various companies are also making some technical reserves and options for the market to fully invest when the market breaks out. Among them, the application of smart dimming of LED lamps, especially in commercial lighting, is expected to increase rapidly. "In LED lighting applications, the challenges facing dimming technology are very large." Marvell Lance Zheng, director of technical marketing for green technology products, said that the current main challenge is that the price of LED light sources is constantly falling, but the driving electronics technology is not very big. Innovative, prices have remained high and there is pressure on costs. Secondly, because LED lighting mostly adopts the current driving mode, and the existing dimmers are mostly voltage dimming, the challenge in compatibility is also quite large. In addition, the trend toward thinner and lighter power supplies also requires smaller size LED drivers. As a consumer, LED lighting products need to use driver IC dimming technology to provide consumers with a unique sensory experience. To meet the challenges posed by these markets, Marvell, as the world's leading supplier of storage, communications and consumer electronics solutions, has conducted long-term R & D on innovative LED driver electronics. Lance Zheng revealed that the company has developed an innovative mixed-signal LED drive architecture that can provide high efficiency, high power factor and low harmonics for LED lighting applications, while advanced dimming technology ensures deep dimming and the existing lighting architecture. compatibility. In addition, the high integration of integrated circuits (ICs) can reduce the cost of materials, allowing the use of compact printed circuit boards (PCBs). In addition, the Marvell solution for the retrofit bulb home market is based on 88EM8183 (deep dimming single-stage AC / DC constant current controller) designed for offline dimmable LED lighting applications. With Marvell's new mixed-signal architecture and signal processing technology, 88EM8138 can achieve a minimum of 1% depth dimming and is highly compatible with a wide range of thyristor dimmers. 88EM8183 adopts a unique primary-side current control mechanism, which can achieve its strict output current rectification in a wider AC input range. During this period, quasi-resonant control, valley switching method and power factor correction function can be used to achieve high efficiency, high power factor, low harmonic distortion and low electromagnetic interference. At the same time, 88EM8183 can significantly reduce the number of external components of dimmable LED drivers. The primary-side control topology eliminates the need for optocouplers and any other relevant secondary feedback circuits, thereby improving system stability. The embedded digital core and analog circuits can effectively manage the dimmer load requirements, while also eliminating the need for external bleeder circuits. In addition, 88EM8183 integrates a high-voltage startup power circuit, so no external startup circuit is needed. "The significant reduction in the number of components and the strong compatibility make Marvell's LED driver prices 20% -40% lower than competitors' similar products." Lance Zheng said that Marvell will have follow-up for 88EM8183, 88EM8801, 88MZ100 Upgrade product launch. The diameter of the DO-41 diode body is in the range of 2.0mm~2.7mm, the length of the diode body is between 4~5.2mm, the diameter of the pins at both ends is between 0.71mm~0.86mm, and the overall length is 25.4mm. DO-41 package,Rectifier Diode,General Porpose Rectifiers Diode,General Porpose Rectifiers Changzhou Changyuan Electronic Co., Ltd. , https://www.cydiode.com
This DO-41 plastic package is available in a through-hole version. This axial lead device is ideal for customer premises equipment (CPE), such as telephones, answering machines, modems, and fax interfaces. When appropriate over-current protection is included, the DO-41 package series can also be used for over-voltage protection in applications such as T1/E1/J1 relay cards.