Regulators and Chips
A regulator and error amplifier technology, applied in the field of electronics, can solve the problems of increasing the power supply of the front stage, burning the chip, power failure of the front stage power supply, etc., and achieve the effect of reducing cost, effective soft start, reducing chip area and power consumption
Active Publication Date: 2022-01-28
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology
When the regulator establishes the output, because the difference between the feedback value and the reference value is too large, it will generate an excessive input current
Excessive input current will increase the overload pressure of the pre-stage power supply such as the pre-stage regulator, cause the pre-stage power supply to lose power, damage the external components of the regulator, or burn the chip of the regulator
Method used
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[0029] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
[0030] Regulators include linear regulators and switching regulators, and switching regulators include inductive switching regulators and capacitive switching regulators. The regulator amplifies the difference between the feedback quantity and the reference quantity through the error amplifier, so as to control the output quantity not to change with the input voltage, load, etc., that is, to adjust the output stability through the negative feedback loop.
[0031] When the regulator starts, because the difference between the feedback value and the reference value is too large, an excessive input current will be generated. Excessive input current will increase the overload pressure of the pre-stage power supply such as the pre-stage regulator, cause the pre-stage power supply to lose power, damage the external components of the regul...
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An embodiment of the present application provides a regulator, which can prevent excessive input current from being generated during startup of the regulator. The regulator includes a power transmission circuit, a negative feedback circuit, a constant current source circuit and a control circuit. The two input terminals of the error amplifier in the negative feedback circuit respectively receive the reference voltage and the feedback voltage corresponding to the output signal of the regulator, and are used to output the first voltage signal when the feedback voltage is less than the reference voltage during the startup process of the regulator, and the feedback voltage is greater than When the reference voltage is used, the second voltage signal is output. The control circuit is used to: control the negative feedback circuit to be disconnected and the constant current source circuit to be turned on according to the first voltage signal, and the constant current source circuit is used to control the input current of the regulator to be constant during the startup process; The current source circuit is disconnected and the negative feedback circuit is turned on. The negative feedback circuit is used to provide a negative feedback adjustment signal to the power transmission circuit, and the power transmission circuit is used to perform negative feedback adjustment on the output signal according to the negative feedback adjustment signal.
Description
technical field [0001] The present application relates to the field of electronic technology, in particular to an adjuster and a chip. Background technique [0002] The regulator amplifies the difference between the feedback value and the reference value through the operational amplifier, so as to control the output value not to change with the input voltage, load, etc., that is, to adjust the output stability through the negative feedback loop. When the regulator establishes the output, because the difference between the feedback value and the reference value is too large, an excessive input current will be generated. Excessive input current will increase the overload pressure of the pre-stage power supply such as the pre-stage regulator, cause the pre-stage power supply to lose power, damage the external components of the regulator, or burn the chip of the regulator. Therefore, how to prevent the regulator from generating excessive input current during the process of esta...
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IPC IPC(8): G05F3/26
CPCG05F3/26G05F1/565H02M3/07G05F1/575H02M1/0045H03K17/167
Inventor 王程左
Owner SHENZHEN GOODIX TECH CO LTD