SiFirstTechnology recently introduced two low-cost drive solutions for the low-power LED lighting industry, the SFL628 and SFL629. They use the PSR architecture, in which the SFL628 drives the external power BJT and the SFL629 has a built-in power BJT. They can be widely used in the field of LED spotlights such as GU10, E14 and E29. As we all know, the PSR architecture of the driving power BJT is favored by LED lighting driver manufacturers because of its low external components and low system cost. However, the current PSR architecture is susceptible to input voltage and load voltage in terms of constant current accuracy, resulting in a decrease in constant current accuracy. At the same time, since the power BJT has a lower withstand voltage than the power MOSFET, in the extreme case, such as a short circuit or an overload, a breakdown phenomenon is likely to occur, resulting in system damage. The SFL628 and SFL629 launched by Saiwei Technology have made many innovations and improvements in constant current accuracy. The SFL628 and SFL629 integrate patented LED constant current AC input voltage compensation, which reduces the LED output constant current accuracy by the input voltage and reduces the external components of the system. Lin Guanqiu, director of R&D of Saiwei Technology, pointed out that the SFL628 can eliminate external input voltage compensation devices under the condition of constant current accuracy. For 3WGU10LED lamps, the total external components of the system can be reduced to 15, which is the highest level in the industry. At the same time, SFL628 and SFL629 also improve the accuracy of the internal constant current reference voltage of the chip, and integrate the output load compensation of the LED constant current, which greatly improves the load regulation rate and further improves the constant current accuracy of the mass production of the system. In terms of system protection, in addition to soft-start protection, VDD overvoltage protection, output overvoltage protection, and pin floating protection, the SFL628 and SFL629 also integrate short-circuit protection. In the case of a short circuit, the maximum frequency of the clamping system can greatly reduce the power tube voltage overshoot during short circuit, thereby improving system reliability. Li Mao, vice president of Saiwei Technology, pointed out that the SFL628 and SFL629 released by Saiwei Technology will reduce the number of BOM devices in the low-power LED lighting system to the limit, and improve the consistency and reliability of the system performance. A competitive low power LED driver solution. The SFL628 is available in a SOT23-5 package and the SFL629 is available in an SOP8 package. (This article Source: Alibaba)
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