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图1所示电路的输出电流在1.2～1.5V的输入电压范围内几乎是恒定的,并对晶体管的增益变化不敏感。晶体管Q_1和Q_2组成一个非稳态触发器。R_1和C确定Q_2的导通时间。在Q_2导通期间,Q_1截止,Q_1的基极电压和电感器L中的电流逐渐升高。当Q_1的基极电压达到大约0.6V时,Q_1导通,而Q_2截止。这种转换在电感器L中引起“逆转”动作。电感器两端的电压极性相反,存储在电感器中的能量以下降的
The output current of the circuit shown in Figure 1 is almost constant over the 1.2 to 1.5V input voltage range and is insensitive to transistor gain variations. Transistors Q_1 and Q_2 form a non-steady state flip-flop. R_1 and C determine the on-time of Q_2. During the turn-on period of Q_2, Q_1 ends, and the base voltage of Q_1 and the current in inductor L gradually rise. When the base voltage of Q_1 reaches about 0.6V, Q_1 turns on and Q_2 ends. This conversion causes “reverse” action in inductor L. The voltage across the inductor is opposite in polarity, and the energy stored in the inductor drops