Current equalization circuit and method, and LDO power supply system
A technology of current balance and circuit, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc. It can solve problems such as LDO deviation, current difference, and output distance difference, and achieve stable output voltage, small voltage drop, and reduced The effect of the difference in current
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[0075] use image 3 and Figure 4 The two LDOs shown supply power to the same power network, define the equivalent resistance between the output terminal out1 of LDO1 and the current consumption point Inode as rpnw1, the current provided by LDO1 to the current consumption point Inode is iload1, and the output terminal of LDO2 The equivalent resistance between out2 and the current consumption point Inode is rpnw2, and the current provided by the LDO2 to the current consumption point Inode is iload2.
[0076] If the sum of the resistance values of the equivalent resistance rpnw1 and the equivalent resistance rpnw2 is 40 milliohms, the offset voltage Vos1 of the operational amplifier EA1 of LDO1 and the offset voltage Vos2 of the operational amplifier EA2 of LDO2 are both 0V, Figure 5 is adopted Figure 4 The graph of the relationship between the load current and the line equivalent resistance of two LDOs supplying power to the same power network is shown, where the abscissa...
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