Error amplifier, transconductance amplifier and gain amplifier for composing DC-DC converter
A technology of gain amplifier and error amplifier, which is applied in the direction of gain control, amplification control, electrical components, etc., can solve the problems affecting the efficiency of DC-DC converters, load adjustment rate and linear adjustment rate index, error amplifier power consumption increase, DC Gain reduction and other issues, to achieve good application prospects, reduce power consumption, improve the effect of DC gain
Active Publication Date: 2015-12-23
CHONGQING SOUTHWEST INTEGRATED CIRCUIT DESIGN
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Problems solved by technology
The circuit is usually biased by a constant current source, and the current output / absorbed by the error amplifier output terminal COMP is limited by the constant current source, and the transient response is slow
If the constant current source current is increased, the power consumption of the error amplifier will increase, and the DC gain will decrease, which will affect the efficiency, load regulation and line regulation index of the DC-DC converter
Method used
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[0026] see Figure 1 to Figure 3 , the error amplifier of the DC-DC converter consists of a transconductance amplifier 1, a gain amplifier 2, a compensation resistor R and a compensation capacitor C 1 、C 2 Composition; the positive input terminal of the transconductance amplifier 1 is connected to the positive input terminal of the gain amplifier 2, and at the same time it is connected to the reference voltage V REF terminal; the input negative terminal of the transconductance amplifier 1 is connected to the input negative terminal of the gain amplifier 2, and the feedback voltage V is connected at the same time FB terminal; the output of transconductance amplifier 1 provides dynamic bias current I for gain amplifier 2 SS ; The output terminal COMP of the gain amplifier 2 passes through the compensation resistor R and the compensation capacitor C 1 、C 2 grounded. The transconductance amplifier amplifies the absolute value of the difference between the reference voltage an...
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The invention discloses an error amplifier, a transconductance amplifier and a gain amplifier for composing a DC-DC converter. The error amplifier, the transconductance amplifier and the gain amplifier are characterized in that: the transconductance amplifier amplifies an absolute value of difference between a reference voltage and a feedback voltage, outputs a current proportional to the absolute value of difference between the reference voltage and the feedback voltage, and provides a dynamic bias current for the gain amplifier; the gain amplifier amplifies the absolute value of difference between the reference voltage and the feedback voltage, and outputs or absorbs a current proportional to the absolute value of difference between the reference voltage and the feedback voltage; and when the feedback voltage is less than the reference voltage, an output end of the gain amplifier outputs a current, and when the feedback voltage is greater than the reference voltage, the output end of the gain amplifier absorbs a current. The error amplifier, the transconductance amplifier and the gain amplifier effectively increase efficiency, load adjustment rate, linear adjustment rate and transient state response speed of the DC-DC converter, and have good application prospect.
Description
technical field [0001] The present invention relates to an error amplifier, in particular to an error amplifier, a transconductance amplifier and a gain amplifier constituting a DC-DC converter. Background technique [0002] The DC-DC converter is an important component widely used in the field of power management, and it can be used in mobile phones, mobile power supplies, network communications, automotive electronics, consumer electronics and other fields. With the rapid development of power management technology, the requirements for the efficiency, transient response speed, load regulation rate, linear regulation rate and other indicators of DC-DC converters are getting higher and higher, and the performance of the error amplifier is the decisive factor for DC-DC converters. important factors for the above indicators. The role of the error amplifier in a peak current mode pulse width modulation (PWM) controlled DC-DC converter is to convert the feedback voltage V FB a...
Claims
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IPC IPC(8): H03G3/20
Inventor 贺旭东范麟万天才刘永光徐骅李明剑王皓嶙陈勇屹谭棋心秦谋陈罡子
Owner CHONGQING SOUTHWEST INTEGRATED CIRCUIT DESIGN
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