Linear regulated power supply

Abstract

The invention discloses a linear voltage-stabilizing power supply which comprises a current-sharing control circuit. The current sharing control circuit comprises at least one current sharing controlunit, and each current sharing control unit comprises a driving voltage adjusting circuit, a linear voltage stabilizing circuit and a feedback circuit, wherein the feedback circuit is used for feedingback the voltage of a current sampling resistor of the linear voltage stabilizing circuit to the driving voltage adjusting circuit; the driving voltage adjusting circuit adjusts the current of the analog control signal Vctrl input into the current sharing control unit according to the voltage value of the current sampling resistor and then outputs the adjusted current to the linear voltage stabilizing circuit, so that the output power of the linear voltage stabilizing circuit is adjusted by adjusting the voltage of the current sampling resistor. Due to the fact that the output power of the linear voltage stabilizing circuit of each current sharing control unit can be adjusted, the problem that the linear voltage stabilizing power supply is uneven in current is solved, stability of the linear voltage stabilizing power supply is improved, and the service life of the linear voltage stabilizing power supply is prolonged.

Description

technical field [0001] The invention relates to the technical field of CMOS integrated circuit design, in particular to a linear regulated power supply. Background technique [0002] Power MOSFET is a power device commonly used in switching converters, and its loss has a direct impact on the performance and efficiency of switching converters. The loss of power MOSFET is mainly composed of two parts: switching loss and conduction loss. Usually we will choose a power MOSFET with low on-resistance, high withstand voltage, high gain, low switching loss, and low gate threshold voltage. But for devices that need to work in linear mode, such as active loads, the above principles are not applicable. Because if the gain of the power MOSFET is too high, considering that its gate threshold voltage has a negative temperature coefficient, it is difficult to keep the drain current constant without applying a negative feedback link, and it may even cause permanent damage to the power MOS...

AI Technical Summary

Problems solved by technology

If the current sharing effect is not good, the temperature rise of one MOS tube is extremely high and the other MOS tube may not work, which will affect the normal use of the MOS tube, reduce the reliability of the MOSFET, and shorten the service life of the linear power supply.

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