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许多廉价的便携式系统(包括小型家用电子产品),都是靠电池或外接式电源供电。当提供的电压低于最小值时,最好切断电源与系统的连接,以防止出现不良后果或不正常的运行。图中IC_1是一LM4041可调参考电压源,LM4041在其正负极间产生一典型电压,从而使“+”极和“ADJ”引脚间的电压为1.24V。由于R_3的作用,当R_1上的电压小于1.24V时,IC_1的“-”引脚接近零。而当通过R_1的电压高于1.24V时,IC_1“-”引脚处的电压比V_+低1V左右。
Many of the cheap portable systems, including small home electronics, are powered by batteries or external power supplies. When the supplied voltage is less than the minimum value, it is best to cut off the connection of the power supply to the system to prevent adverse effects or abnormal operation. IC_1 is an LM4041 adjustable voltage reference. The LM4041 generates a typical voltage between its positive and negative terminals so that the voltage between the “+” terminal and the “ADJ” pin is 1.24V. Due to the effect of R_3, the “-” pin of IC_1 approaches zero when the voltage on R_1 is less than 1.24V. When the voltage across R_1 is higher than 1.24V, the voltage at IC_1 “-” pin is about 1V lower than V_ +.