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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

Active Publication Date: 2020-10-09
XI AN UNIIC SEMICON CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the different distances between the current consumption point and the output of the two LDOs and the deviation between the LDOs, the current provided by the two LDOs for the same network shows a significant difference

Method used

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  • Current equalization circuit and method, and LDO power supply system
  • Current equalization circuit and method, and LDO power supply system
  • Current equalization circuit and method, and LDO power supply system

Examples

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Embodiment Construction

[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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PUM

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Abstract

The invention discloses a current equalization circuit and method, and an LDO power supply system. The current equalization circuit comprises N compensation modules, wherein the N compensation modulesand the N LDOs are in one-to-one correspondence. Each compensation module comprises a branch current sampling module, an average current sampling module and a feedback module, wherein the branch current sampling module is used for sampling current provided for a current consumption point by the LDO corresponding to the branch current sampling module so as to obtain branch sampled current; the average current sampling module is used for sampling average current provided for the current consumption point by each LDO to obtain average sampled current; and the feedback module is used for comparing the branch sampled current with the average sampled current to obtain an error current, and feeding back the error current to the corresponding LDO. According to the current equalization circuit andmethod and the LDO power supply system provided by the invention, current equalization in power supply to the same network by multiple LDOs can be realized.

Description

technical field [0001] The invention relates to the technical field of multiple LDOs supplying power to the same power supply network, in particular to a current equalization circuit and method, and an LDO power supply system. Background technique [0002] In recent years, electronic systems have developed towards high integration and simplified applications, and more and more functions are integrated in a single chip, while the types of peripheral power supply are becoming less and less, which requires more LDO (low dropout Linear regulator, lowdropout regulator) to provide stable working power for each module inside the chip. Since the chip layout is limited by factors such as limited overall area, fixed package form, functional block division, and irregular module layout shape, the distances from the LDO output to each current consumption point in the power supply network are different, especially for current consumption with large current consumption. point or module, t...

Claims

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Application Information

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IPC IPC(8): H02M3/156
CPCH02M3/156H02M1/0009H02M1/0025
Inventor 谢永宜侯彬周骏王荣华
Owner XI AN UNIIC SEMICON CO LTD
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