Linear voltage regulator for compensation zero point dynamic adjustment
A linear voltage regulator and dynamic adjustment technology, which is applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., can solve the problems of fixed compensation zero frequency and failure to meet frequency compensation requirements, so as to meet power supply requirements and good power supply suppression characteristics and noise characteristics, the effect of cheap
Active Publication Date: 2014-06-04
ALLWINNER TECH CO LTD
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a linear voltage regulator with dynamic adjustment of the compensation zero point in view of the deficiencies of the prior art, which overcomes the problem that the linear voltage regulator in the prior art utilizes a capacitor and its equivalent series resistance structure to compensate the zero point, The frequency of the compensation zero point is fixed, which cannot meet the defect of frequency compensation requirements
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[0019] like figure 1 , figure 2 , image 3 and Figure 4 As shown in the figure, a linear voltage regulator for compensating for dynamic adjustment of zero point includes an error amplification module, a buffer module, a power module, a feedback resistor module, a load tracking module, a frequency compensation module and a load capacitor, a buffer module, a power module, and a load tracking module. It is connected to the frequency compensation module in sequence, the error amplification module is connected to the input end of the buffer module, the feedback resistance module is connected to the input end of the error amplification module and the output end of the power module, the load capacitor is connected to the output end of the power module, and the error amplification module is used for the amplification loop. The error between the feedback voltage and the reference voltage, the buffer module is used to prevent low-frequency poles at the input end of the power module,...
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The invention discloses a linear voltage regulator for compensation zero point dynamic adjustment. The linear voltage regulator comprises an error amplifying module, a buffering module, a power module, a feedback resistance module, a load tracing module, a frequency compensation module and a load capacitor. According to the linear voltage regulator, the position of an internal zero point for frequency compensation can be adjusted along with the change of a load current, and when the load current is small, the frequency of an output pole is low, and the frequency of the compensation zero point is low. As the load current is increased, the output pole moves towards the high-frequency direction, the compensation zero point also moves towards the high-frequency direction, the compensation zero point dynamically offsets the output pole, and therefore a loop can be kept stable within a wide load current range. According to the linear voltage regulator, the stability of the linear voltage regulator does not relay on an ESR of the load capacitor, and therefore a ceramic capacitor low in cost and small in size can be selected as the load capacitor. Meanwhile, the linear voltage stabilizer has good power source rejection characteristics and noise characteristics and can meet the power supply requirement of a high-performance artificial circuit.
Description
technical field [0001] The invention relates to the technical field of voltage regulators, in particular to a linear voltage regulator for dynamic adjustment of zero point compensation. Background technique [0002] Current portable electronic devices are usually powered by lithium batteries. Scientific power management can give full play to the performance of electronic devices, save power consumption and prolong battery life. When the lithium battery is fully charged, the voltage is about 4.2V, and when the discharge is completed, the voltage is below 3V. During the entire discharge cycle of lithium batteries, large voltage fluctuations will affect the normal operation of certain circuits. Therefore, a regulator must be introduced into the power management system. There are two commonly used voltage regulator circuits, namely, Switching-Mode Power Converter (SMPC) and Low-Dropout Regulator (LDO). The switching power converter has high efficiency, and can step down as w...
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IPC IPC(8): G05F1/56
Inventor 梁源超邓琴
Owner ALLWINNER TECH CO LTD