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北京2922T、2923T彩电小信号处理电路采用飞利浦单片小信号处理电路TDA8844,该小信号处理电路不但具有多种制式彩电小信号处理功能,还具有多重保护功能:TDA884X系列电路的22脚(BCLIN)为束电流限制/场输出保护端口,50脚(EHT)为过压检测端口,是厂家设计的专用保护检测端口;另外,41脚为行逆程脉冲输入端口,18脚为白平衡自动调整取样电流输入端口,当外部无信号输入或引脚电压发生故障时,也会进入保护状态。北京2922T彩电围绕TDA8844的22、50脚和41、18脚,开发了过流、过压保护电路。
Beijing 2922T, 2923T color TV small signal processing circuit using Philips single chip small signal processing circuit TDA8844, the small signal processing circuit not only has a variety of standard TV small signal processing functions, but also has multiple protection functions: 22 TDA884X series circuit (BCLIN) For the beam current limit / field output protection port, 50 feet (EHT) for the over-voltage detection port, the manufacturer designed dedicated protection detection port; In addition, 41 feet for the line pulse input port, 18 feet for the automatic adjustment of white balance sampling Current input port, when there is no external signal input or the pin voltage fails, it will also enter the protection state. Beijing 2922T color TV TDA8844 around the 22,50 and 41,18 foot, developed over-current, over-voltage protection circuit.