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Voltage Compensation Circuit and Low Dropout Linear Regulator

A low-dropout linear, voltage compensation technology, applied in the field of electronics, can solve the problems of voltage changes and the failure of the output voltage to follow accurately.

Active Publication Date: 2017-01-18
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem solved by the present invention is that the output voltage of the existing low-dropout linear regulator will change with the change of the load, and the output voltage cannot accurately follow the input set voltage value

Method used

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  • Voltage Compensation Circuit and Low Dropout Linear Regulator
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  • Voltage Compensation Circuit and Low Dropout Linear Regulator

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Embodiment Construction

[0027] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] Such as figure 2 As shown, the embodiment of the present invention provides a voltage compensation circuit suitable for connecting with a low dropout linear voltage regulator. The voltage compensation circuit includes: a first operational amplifier OP1, a second operational amplifier OP2, a third operational amplifier OP3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor The resistor R6, the seventh resistor R7, the eighth resistor R8, the first capacitor C1 and the dynamic resistance unit Ra.

[0029] The non-inverting input terminal of the first operational amplifier OP1 is connected to the first terminal of the first resistor R1 and the first terminal of...

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PUM

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Abstract

The invention provides a voltage compensating circuit and a low dropout linear voltage stabilizer, wherein the voltage compensating circuit is connected to the low dropout linear voltage stabilizer; the voltage compensating circuit comprises a first operational amplifier, a second operational amplifier, a third operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor and a dynamic resistance unit; and a resistance value of the dynamic resistance unit is related with a current value at a first end of the dynamic resistance unit. The voltage compensating circuit can dynamically compensate a voltage at an output end of the low dropout linear voltage stabilizer according to a load condition, so that the output voltage is stabilized.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a voltage compensating circuit and a low-dropout linear voltage stabilizing device. Background technique [0002] The low dropout regulator (LDO) is a new generation of integrated circuit regulator. The biggest difference between it and the three-terminal regulator is that the LDO is a miniature system-on-chip with very low self-consumption. LDO usually has very low self-noise and high power supply rejection ratio (Power Supply Rejection Ratio, PSRR). [0003] Such as figure 1 As shown, the existing low-dropout linear regulator includes: an operational amplifier OP, an output transistor P and a current source I0. The non-inverting input terminal of the operational amplifier OP is connected to the output terminal of the current source I0 and the reference voltage input terminal SET of the low dropout linear regulator. The negative phase input terminal of the operational amplifier OP ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 孙登晴袁光义
Owner SPREADTRUM COMM (SHANGHAI) CO LTD