Applications to increase output voltage (b)

It is an application circuit that uses a voltage dividing resistor to increase the output voltage. This circuit only requires an external resistor R. and R2,
the current flowing through R2 is: Vx/Ri+Id, and the output voltage of the voltage stabilizing circuit is:
Lang. The output voltage vo is only related to R2 gate l and Vx.
In addition, the circuit in Figure 7-18 (b) can also be used to increase the output voltage. The output voltage expression is:
    In Figure (b), VT2 uses a diode composed of a base and an emitter short-circuited. Because of this The diode has
a positive temperature coefficient, and it and the VTi with a negative temperature coefficient form a voltage dividing circuit with temperature compensation function, which
greatly improves the stability of the circuit.
    An adjustable regulated power supply can also be formed by using a three-terminal fixed integrated voltage regulator. The simplest method is to change the resistor
R2 in Figure 7-18 to a potentiometer, then the output voltage can be adjusted from the rated output voltage of the integrated voltage regulator used, up to Vimax - (vi-Vo) Blood.     In the formula: lV i,TW——the maximum value of the input voltage;     (Vi-Vo)qu——the minimum value of the input- output voltage difference.