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索尼KV—2565MT/2565MTJ/2965MT系列彩电,电源电路采用了一块新开关电源厚膜电路STR—55741,其内部电路及由它构成的开关电源电路如图1所示。STR—S5741内部Q_1为大功率开关管,Q_2为脉宽调整管,Q_3为保护控制管,Q_4为误差放大管,R_4、R_5、R_6及D_3为取样基准元件。STR-55741它与传统开关电源厚膜块不同的是增加了一只Q_5控制管,其作用是改善对开关管Q_1的正反馈激励条件。
Sony KV-2565MT / 2565MTJ / 2965MT series of color TV, power supply circuit using a new thick film switching power supply STR-55741, the internal circuit and the circuit constituted by the switching power supply shown in Figure 1. STR-S5741 internal Q_1 for high-power switch, Q_2 for the pulse width adjustment tube, Q_3 for the protection control tube, Q_4 for the error amplifier, R_4, R_5, R_6 and D_3 for the sampling reference components. STR-55741 It is different from the traditional switch power thick film block is the addition of a Q_5 control tube, and its role is to improve the positive feedback switching Q_1 excitation conditions.