Three-terminal voltage stabilizing chip series voltage stabilization and current expansion circuit diagram

When an output current greater than 0.1A is required, other types of integrated circuits can be used or a current expansion circuit as shown in the figure below can be used . The output current of the 78 series current expansion circuit is I0=I01+I02

The three-terminal voltage stabilizing chip series voltage stabilizing and current expansion circuit has an overcurrent protection function. During normal operation, T2 and T3 are cut off; when IO overcurrents, IO1 increases, and the voltage drop of the current-limiting resistor R3 increases, causing T3 and T2 to successively When it is turned on, the VBE of T1 decreases, limiting the IC1 of T1 and protecting T1 from damage due to overcurrent.