Step-down circuit in medium voltage and high voltage integrated circuit

Abstract

A step-down circuit in a medium voltage and high voltage integrated circuit provides a power source for a low-voltage control part in the integrated circuit. The step-down circuit comprises an MOS transistor N1 and a capacitor C1 and is characterized in that a drain electrode of the MOS transistor N1 is connected with an input end VCC of an external power-supply high-voltage power source, a source electrode of the MOS transistor N1 is grounded through the capacitor C1, the source electrode of the MOS transistor N1 is connected with an output end VDD of a low-voltage power source and supplies power to an inner control circuit, a substrate of the MOS transistor N1 is grounded, a grid electrode of the MOS transistor N1 is connected with a control voltage through signals, the MOS transistor is a high-voltage type N-channel depletion transistor or a zero-voltage intrinsic transistor, and the voltage value of a control voltage signal is larger than or equal to 0V. The step-down circuit is simple in structure and reliable, static current consumption is small, and step-down performance and voltage stabilizing performance are good.

Description

technical field [0001] The invention relates to a step-down circuit in a medium and high voltage integrated circuit, which can convert the medium and high voltage power supply supplying power to the integrated circuit into a low voltage power supply inside the integrated circuit. This circuit can be widely used in high and low voltage mixed circuits with internal logic control Power management circuits, digital-analog hybrid circuits, etc. Background technique [0002] The application of high-voltage integrated circuits is becoming more and more extensive, and has been widely used in LED drivers, adapters, electrical control and other occasions. The high-voltage circuit with intelligent control is developing rapidly and is more and more favored by people. Medium and high-voltage integrated circuits generally have a high power supply voltage, usually above 7V, which is difficult to directly provide to the intelligent control logic circuit (generally 1.5~5.5v). Although the ...

AI Technical Summary

Problems solved by technology

The advantage of this method is that the output voltage is more accurate, but its disadvantages are obvious: the quiescent current consumed by the conversion circuit is relatively large, the circuit structure and process are complex, the resource consumption is high, and a relatively complicated resistance correction process is required during mass production.

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