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MOSFET(开关管)及其多路保护电路的引脚功能和对地参考电压、对地电阻见表1所示。③开关电源启动后,开关变压器TE004自馈绕组感应的脉冲电压经DE521整流、CE524滤波后,获得直流电压,取代启动电路为NE521的③脚提供启动后的工作电压。(3)稳压控制电路稳压控制电路以取样放大电路NE503(SE005N)、光电耦合器ZE504和厚膜电路NE521的④脚内部电路为核心构成,取样点在+5V-S输出端。
MOSFET (switch) and multi-channel protection circuit pin function and reference voltage to ground, see Table 1 shows. ③ After the switching power supply is started, the pulse voltage induced by the winding of the switching transformer TE004 is rectified by DE521 and filtered by CE524 to obtain the DC voltage. Instead of the starting circuit, the operating voltage of the NE521 pin after startup is provided. (3) Regulator Control Circuit The regulator control circuit consists of the core internal circuit of the sampling amplifier circuit NE503 (SE005N), the photocoupler ZE504 and the thick film circuit NE521. The sampling point is at the + 5V-S output terminal.