OUTPUT STAGE CONTROL CIRCUIT

摘要

PURPOSE:To secure the stable supply of current to the load by extracting the analog signal after the comparison carried out between the detection signal sent from the load and the reference signal and controlling an output drive means with said analog signal. CONSTITUTION:The emitter of an output stage transistor NPN11 is grounded with the collector grounded to a drive voltage (+Vcc) source via the load 13. A means which produces the reference voltage Vr consists of a constant voltage source 25, a variable resistor 27 and a resistor 29 connected with each other. A control transistor PNP15 having its base connected to a common connection point 41 where the voltage Vr is produced. The collector and the emitter of the PNP15 are connected to the base and the collector of the NPN11 respectively.