Line loss compensation module, switching power supply chip and system

Abstract

The invention discloses a line loss compensation module, a switching power supply chip and a system. The line loss compensation module includes a no-load voltage setting module and a load voltage setting module connected in sequence. The no-load voltage setting module includes a reference voltage input terminal, The reference voltage output terminal and the on-load voltage setting module include a sampling voltage input terminal and a line loss compensation configuration terminal; detect the sampling voltage at the sampling voltage input terminal and the reference voltage at the reference voltage input terminal, and use the sampling voltage and the line loss compensation configuration terminal to The external line loss compensation resistor and the reference voltage generate a reference voltage, and the reference voltage is linearly positively correlated with the sampling voltage. The present invention has a line loss compensation function. According to the size of the output load current, the output voltage of the system output terminal is correspondingly increased. The voltage drop of the compensation wire can also flexibly adjust the proportional range of the boosted voltage by adjusting the resistance value of the external line loss compensation resistor, so as to meet the use conditions of power lines of various lengths and ensure the high adaptability of the switching power supply system.

Description

technical field [0001] The invention relates to the technical field of switching power supply chips, in particular to a line loss compensation module, a switching power supply chip and a system. Background technique [0002] In the technical field of switching power supply chips, especially when charging portable electronic devices, bridges need to be bridged through power lines. If the power line is too long, the parasitic resistance will be too large. For example, the power line of a car navigator or a driving recorder is generally about 3m. The parasitic resistance on these power lines will cause a voltage drop when current flows. The greater the value of the flowing current, the greater the voltage drop on the power line, resulting in a decrease in the voltage at the end of the power line, that is, at both ends of the load module, resulting in the inability of the electronic device to supply power at full power. [0003] The reason for the above phenomenon is that the p...

AI Technical Summary

Problems solved by technology

The greater the value of the current flowing, the greater the voltage drop on the power line, resulting in a decrease in the voltage at the end of the power line, that is, at both ends of the load module, resulting in the inability of the electronic device to supply power at full power.

[0003] The reason for the above phenomenon is that the power supply line is too long, and the resistance of the power line cannot be ignored under the condition of high current, so that the power voltage at both ends of the load module is lower than the output voltage of the switching power supply system.

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