A Linear Voltage Regulator with Dynamic Adjustment of Compensation Zero
A linear voltage regulator and dynamic adjustment technology, applied in instruments, adjusting electrical variables, control/regulating systems, etc., can solve the problems of fixed compensation zero frequency, unable to meet the frequency compensation requirements, etc., to meet the power supply demand, good power supply suppression Characteristics and noise characteristics, inexpensive effects
Active Publication Date: 2015-07-29
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] Such as figure 1 , figure 2 , image 3 and Figure 4 As shown, a linear voltage regulator with dynamic adjustment of compensation zero point, including error amplifier module, buffer module, power module, feedback resistor module, load tracking module, frequency compensation module and load capacitor, buffer module, power module, load tracking module It is connected to the frequency compensation module in turn, the error amplifier module is connected to the input end of the buffer module, the feedback resistor module is connected to the input end of the error amplifier module and the output end of the power module, one end of the load capacitor is connected to the output end of the power module, and the other end of the load capacitor Grounded, the error amplifier module is used to amplify the error between the loop feedback voltage and the reference voltage, the buffer module is used to prevent the low frequency pole at the input end of the power module, the power m...
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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 with dynamic adjustment of compensation zero point. Background technique [0002] Today's portable electronic devices are usually powered by lithium batteries. Scientific power management can give full play to the performance of electronic equipment, save power consumption and prolong battery life. When the lithium battery is fully charged, the voltage is about 4.2V, and when the discharge ends, the voltage is below 3V. During the entire discharge cycle of a lithium battery, large voltage fluctuations will affect the normal operation of some circuits. Therefore, a regulator must be introduced into the power management system. There are two types of voltage stabilizing circuits commonly used, namely a switching power converter (Switching-Mode Power Converter, SMPC for short) and a low-dropout linear regulator (Low-Dropout Regulator, LDO for...
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IPC IPC(8): G05F1/56
Inventor 梁源超邓琴
Owner ALLWINNER TECH CO LTD