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STR—S6709电源厚膜电路是日本三根(SanKen)电子公司为大屏幕彩电研制的新一代开关电源专用厚膜集成块。从图1IC方框示意图中可看出:它由独立的振荡器的激励器完成振荡激励驱动和脉宽调制,去掉了传统的正反馈振荡电路(包括振荡绕组),使交流电网电压的波动变化对开关管工作状态的影响降低到最小,交流电压波动范围可达100V至260V。有较完善的启动、过压和过流保护电路。一般用在74cm大屏幕彩电开关电源中(STR—S6708功率略小,用于64
STR-S6709 power thick film circuit is Japan’s three (SanKen) Electronics for the development of large-screen color TV a new generation of switching power supply thick film manifold. It can be seen from the block diagram in Figure 1IC that it consists of an independent oscillator exciter to complete the oscillation drive and pulse width modulation, eliminating the traditional positive feedback oscillation circuit (including the oscillation winding), the AC grid voltage fluctuations change The impact on the working state of the switch is reduced to a minimum, and the AC voltage fluctuation range can reach 100V to 260V. Have a better start, over-voltage and over-current protection circuit. Generally used in 74cm large screen color TV switching power supply (STR-S6708 slightly smaller power, for 64