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一、CN—5机芯系列彩电开关电源分析 CN—5机芯系列彩电(如:N2918/N2516、R2918N/R2916N/R2518N/R2516N、2918FN/21516FN等型号),开关电源主要采用汤姆逊公司生产的TEA2261电源前置集成电路(参见图1)。TEA2261内含一个固定频率的振荡器、一个电压基准电路、一个误差放大器和一个脉冲宽度调制器(PWM)、缓冲放大器,以及含有过流、过压、欠压保护电路和软启动电路。TEA2261各引脚功能及电压数据如表1所示。表1 TEA2261引脚功能及维修参考数据
CN-5 movement series color TV switching power supply CN-5 movement series color TV (such as: N2918 / N2516, R2918N / R2916N / R2518N / R2516N, 2918FN / 21516FN and other models), switching power supply mainly by the Thomson company TEA2261 power supply front integrated circuit (see Figure 1). The TEA2261 includes a fixed-frequency oscillator, a voltage reference, an error amplifier, a pulse width modulator (PWM), buffer amplifier, and overcurrent, overvoltage, brown-out protection and soft-start circuitry. TEA2261 each pin function and voltage data as shown in Table 1. Table 1 TEA2261 pin function and maintenance reference data