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LDO parallel current sharing circuit

A circuit and parallel technology, applied in the direction of electrical components, output power conversion devices, etc., can solve problems such as overcurrent protection failure, unbalanced working status, etc., to achieve reliable power supply, balanced load current, and simple design.

Inactive Publication Date: 2018-12-18
SHANDONG CHAOYUE DATA CONTROL ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing problems are as follows: parallel operation of LDOs needs to solve the problem of load current balance, otherwise the inherent differences between LDOs will cause the LDO with a slightly higher output voltage to share a larger current and enter an unbalanced working state until overcurrent protection or failure due to thermal shutdown

Method used

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Embodiment 1

[0028] The LDO parallel current sharing circuit includes two parallel LDO circuits U1 and U2, and also includes a current sharing control loop, which is set at the input ends of the two parallel LDO circuits U1 and U2; The current control loop is composed of an operational amplifier A, two detection resistors R1, R2 and an adjustment resistor R3. The detection resistor will carry a large current, and the power resistor should be selected. In order to control the accuracy, a precision power resistor with an accuracy of more than 1% should be selected. Resistance, and the resistance value of the detection resistor should not be too large, and the resistance value of the detection resistor is selected to be less than or equal to 30 milliohms.

[0029] The two detection resistors R1 and R2 are connected to the input terminal of the operational amplifier A, and the output terminal of the operational amplifier A is connected to the output feedback pin FB of the LDO circuit U1. An ad...

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Abstract

The invention discloses an LDO parallel current sharing circuit. The LDO parallel current sharing circuit comprises two parallel LDO circuits U1 and U2, and also comprises a current sharing control loop. The current sharing control loop is arranged at the input terminals of two parallel LDO circuits U1 and U2. The LDO parallel current sharing circuit comprises two parallel LDO circuits U1 and U2.The current sharing control loop consists of an operational amplifier A, two sense resistors R1, R2 and a regulating resistor R3. The two sense resistors R1, R2 are connected to the input terminal ofthe operational amplifier A, and the output terminal of the operational amplifier A is connected to the output feedback pin FB of the LDO circuit U1 through the regulating resistor. Compared with theprior art, the LDO parallel current sharing circuit provided by the invention has the advantages of simple design, high precision, realizing load current balance when two LDOs work in parallel, and ensuring reliable power supply.

Description

technical field [0001] The invention relates to the technical field of low-dropout linear regulators, in particular to an LDO parallel current sharing circuit. Background technique [0002] In the DC / DC power supply design of electronic systems, switching power supplies and LDOs are currently the most commonly used. The switching power supply has high efficiency and large output current, but due to its switching characteristics, the output voltage ripple noise is relatively large. A low dropout regulator (Low Dropout Regulator, LDO for short) can generate a regulated output voltage to provide power for a chip, and is currently widely used in a System-on-a-Chip (SoC for short). Low-dropout linear regulators can be divided into ordinary LDO circuits and capacitorless LDO circuits (capacitorless LDO) according to whether they need bypass capacitors. Ordinary LDO circuits generally require one or two bypass capacitors, while capacitorless LDO circuits generally require one or t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32
CPCH02M1/32
Inventor 戴晓龙吴之光徐成焱李童
Owner SHANDONG CHAOYUE DATA CONTROL ELECTRONICS CO LTD
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