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6.由正稳压器组成的正负跟踪稳压电路电路图如图11所示。图中,运放是单位增益反相放大器,CD77作为输出晶体管,3CG14作为负稳压电路的限流保护管。7.负稳压器 W7900的基本应用电路电路形式与图6相似,只是图中稳压器采用 W7915,电容器 C_1和 C_2选用容量分别为2.2μF 和1μF 的固体钽电容器。如果用铝电解电容器,容量必须大于25μF。负稳压器 W7900有与正稳压器 W7800相类似的各种应用电路。这里要说明的是,正集成稳压器用NPN 射极跟随器作输出级,而负集成稳压器是用NPN 的共射极放大器作为输出级,负载是接在调整管的集电极上。因为在单片集成稳压器中,单片 PNP 晶
6. Positive and negative tracking regulator composed by the positive regulator circuit shown in Figure 11. The figure, the op amp is a unity gain inverting amplifier, CD77 as the output transistor, 3CG14 as a negative voltage regulator circuit protection tube. 7. The basic application circuit of negative voltage regulator W7900 is similar to that of Figure 6, except that the voltage regulator in the figure adopts W7915, and the capacitors C_1 and C_2 use solid tantalum capacitors with capacities of 2.2μF and 1μF respectively. If using aluminum electrolytic capacitors, the capacity must be greater than 25μF. The negative regulator W7900 has a variety of application circuits similar to the positive regulator W7800. It should be noted here is that the integrated voltage regulator is NPN emitter follower for the output stage, and negative integrated regulator NPN is the common emitter amplifier as the output stage, the load is connected to the collector of the regulator. Because in the monolithic integrated regulator, monolithic PNP crystal