Low dropout voltage regulator with nmos output power tube
A low-dropout voltage regulator and output power technology, which is applied in the direction of instruments, control/regulation systems, and adjustment of electrical variables, etc., to achieve the effect of improving the load regulation rate
Active Publication Date: 2022-02-01
SHANGHAI ANLOGIC INFOTECH CO LTD
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Problems solved by technology
However, in the prior art, there is a lack of a current detection circuit and a load regulation circuit for a low dropout voltage regulator of an NMOS output power transistor.
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[0021] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by those skilled in the art to which the present invention belongs. As used herein, "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other el...
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The invention provides a low-dropout voltage regulator of an NMOS output power transistor, which includes a low-dropout voltage stabilizing unit and a current detection unit, and the current detection unit includes a second NMOS transistor, a third NMOS transistor, a fourth NMOS transistor, and a detection amplifier. The drain of the second NMOS transistor is connected to the input voltage, the gate of the second NMOS transistor is connected to the gate of the first NMOS transistor, and the source of the second NMOS transistor is connected to the first NMOS transistor of the sense amplifier. An input terminal is connected to the drain of the fourth NMOS transistor, the second input terminal of the detection amplifier is connected to the source of the first NMOS transistor, and the output terminal of the detection amplifier is connected to the third NMOS transistor connected to the gate of the fourth NMOS transistor, and the sources of the third NMOS transistor and the fourth NMOS transistor are grounded. In the low dropout regulator of the NMOS output power transistor, the output current of the low dropout voltage stabilizing unit can be detected, so that the load regulation rate of the low dropout voltage stabilizing unit can be improved according to the magnitude of the output current.
Description
technical field [0001] The invention relates to the technical field of low-dropout voltage regulators, in particular to a low-dropout voltage regulator of an NMOS output power tube. Background technique [0002] The low-dropout voltage regulator includes an output power period, a feedback network, and an error amplifier. The output current varies widely with the load, which affects the stability of the circuit, operating temperature, and output voltage. [0003] Among them, the change of the output current causes the output change of the power supply, which can be described by the load regulation (LoadRegulation) index, and the formula can be expressed as: LoadRegulation=|Vfl-Vml| / Vhlx100%, Vfl and Vml are low dropout voltage regulators respectively Output voltage at full load and minimum load, Vhl is the output voltage at half load. When the load increases, the output voltage decreases. On the contrary, when the load decreases, the output voltage increases. Therefore, the ...
Claims
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IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 罗可欣
Owner SHANGHAI ANLOGIC INFOTECH CO LTD