Linear voltage stabilizing circuit

摘要

A linear voltage stabilizing circuit includes a main stabilizing unit, a first resistor, a second resistor, and a sub-stabilizing unit. The main stabilizing unit includes a first transistor connected between a signal input terminal and a signal output terminal, and a first comparator controlling the first transistor. The first and the second resistor are connected between the signal input terminal and ground. The voltage between the first resistor and the second resistor is equal to a first reference voltage. The sub-stabilizing unit includes a third resistor, a fourth resistor, a second transistor connected between the signal input terminal and the first transistor, and a second comparator. The third and fourth resistor are connected between the second comparator and ground. The node of the third and fourth resistor is connected to the node between the first and the second resistor. The second comparator controls the second transistor turn on or off.

主权项

1. A linear voltage stabilizing circuit, comprising:
a main stabilizing unit comprising:
a first transistor connected between a signal input terminal and a signal output terminal;a first comparator configured for comparing output voltage of the first transistor and a first reference voltage to control the first transistor turn on or turn off; a first resistor connected to the signal input terminal; a second resistor connected to the first resistor, the voltage of a node between the first resistor and the second resistor being about equal to the first reference voltage; a sub-stabilizing unit comprising:
a second transistor connected in series between the signal input terminal and the first transistor;a third resistor;a fourth resistor connected between the third resistor and ground, and a node between the fourth resistor and the third resistor electrically connected to the node between the first resistor and the second resistor;a second comparator connected to the second transistor, and the second comparator comparing the output voltage of the second transistor and a second reference voltage of the node between the third resistor and the second comparator,wherein when the output voltage of the second transistor is greater than the second reference voltage, the second comparator controls the second transistor to turn on, otherwise, the second comparator controls the second transistor to turn off.