Linear voltage regulator with stability compensation
A technology of linear voltage regulators, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of chip cost and adverse effects of size
Active Publication Date: 2021-04-13
CHENGDU MONOLITHIC POWER SYST
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Problems solved by technology
For on-chip capacitors, under the same capacitance value, a higher rated voltage means a larger chip area, which will undoubtedly have a negative impact on the cost and size of the chip
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[0015] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that the accompanying drawings and described embodiments provided herein are only for illustration and are not intended to limit the present invention, and the accompanying drawings are not necessarily drawn to scale. . In the following description, numerous specific details are set forth in order to facilitate a thorough understanding of the present invention. It will be understood by those of ordinary skill in the art that these specific details are not necessary to the practice of the present invention. In addition, for the sake of clarity and conciseness, some well-known circuits, materials or methods have not been described in detail.
[0016] Throughout this specification, "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection w...
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Disclosed is a linear voltage regulator. The linear voltage regulator comprises a transistor, an error amplifier, a feedback circuit and a compensation circuit; the transistor is provided with a first terminal coupled to receive an input voltage, a second terminal coupled to provide an output voltage, and a control terminal; the error amplifier is provided with a first input end, a second input end and an output end, the first input end is coupled to receive a reference voltage, and the output end is coupled to the control end of the first transistor; the feedback circuit is provided with an input end and an output end, the input end is coupled to the second end of the transistor to receive the output voltage, and the feedback circuit generates a feedback voltage at the output end based on the output voltage; and the compensation circuit is coupled between the output end of the feedback circuit and the second input end of the error amplifier, and generates a compensation voltage at the second input end of the error amplifier based on the feedback voltage; the compensation circuit comprises a compensation capacitor; and a zero point is introduced into an open-loop transfer function of the linear voltage regulator so as to improve the stability of the linear voltage regulator.
Description
technical field [0001] This invention relates to electronic circuits and, in particular, to linear voltage regulators. Background technique [0002] Due to its simple structure, low cost, and small quiescent current, LDO (low dropout linear voltage regulator, low dropout linear voltage regulator) is widely used in applications where the output voltage is relatively close to the input voltage. In order to maintain system stability, it is usually necessary to set a compensation circuit in the control loop of the LDO. [0003] figure 1 It is a circuit schematic diagram of an existing LDO, including a transistor M1, resistors R1, R2 and an error amplifier AMP1. A capacitor C1 is connected in parallel across the resistor R1 to introduce a zero point in the open-loop transfer function of the LDO, thereby enhancing system stability. for figure 1 In the circuit shown in FIG. 1 , when the output voltage Vout is high, the capacitor C1 also needs to have a high rated voltage. In a...
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IPC IPC(8): G05F3/26
CPCG05F3/26G05F1/575G05F1/461G05F1/468
Inventor 钟昌贤
Owner CHENGDU MONOLITHIC POWER SYST