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韩国LC 291NCH型大屏幕彩电(采用相同电路的还有LG251NCH型号)的开关电源的核心元件,选用的是日本三根电子公司最新研制生产的开关电源专用STR—F6654型号厚膜集成电路(只有5个引脚),配套了新器件:四端可控制稳压集成电路KA78R08,取样比较放大器SE130N和内附偏置R的GR晶体管等,整个开关电源简洁、性能优良。笔者为了使读者先睹为快,配图做开关电源工作原理浅析,并整理出该集成电路的维修数据,供同行参考。
South Korea LC 291NCH-type large-screen color TV (using the same circuit there LG251NCH models) of the switching power supply core components, the choice is Japan’s three electronics company newly developed switching power supply for STR-F6654 type thick film integrated circuit (only 5 Pin), supporting a new device: four-terminal regulator IC KA78R08 can be controlled, sample and compare amplifier SE130N and included offset R GR transistor, the entire switching power supply simple, excellent performance. The author in order to make readers sneak preview, with plans to do the principle of switching power supply, and sorted out the integrated circuit repair data for peer reference.