Soft start controller

Abstract

The invention discloses a soft start controller. The soft start controller comprises an input terminal, a negation gate, a field effect transistor, and a current limiting unit, wherein the input terminal is electrically connected with a reference voltage source of a chip; the input terminal of the negation gate is electrically connected with the input terminal of the soft start controller; the grid electrode of the field effect transistor is electrically connected with the output terminal of the negation gate, the drain electrode / source electrode of the field effect transistor is electrically connected with an operating voltage source of the soft start controller, the source electrode / drain electrode of the field effect transistor is electrically connected with the output terminal of the soft start controller; the current limiting unit is connected with a current mirror image unit; and the current mirror image unit controls the current of the negation gate and the field effect transistor through the current limiting unit.

Description

technical field [0001] The invention relates to a soft start controller, in particular to a soft start control circuit with simple structure and easy realization. Background technique [0002] An integrated circuit chip is an electronic component with extremely high electrical precision. To start an integrated circuit, it is first necessary to apply a voltage to the chip, which is usually several volts or tens of volts. [0003] Sudden application of working voltage on the integrated circuit chip will bring about an instantaneous power-on impulse current, which will often cause an instantaneous sudden change in the power supply voltage, causing a sudden change in the working status of each device inside the chip, which may easily cause electrical failure of one or some devices , causing the chip to fail to work or even burn out. The higher the integration level of the chip, the easier it is for the above phenomenon to occur. An effective way to solve the above problems is...

AI Technical Summary

Problems solved by technology

However, the realization of this soft start usually requires complex control circuits, which increases the cost of integrated circuits.

At present, there are two commonly used schemes as follows: one is to connect devices such as current limiting resistors in series to make the input current increase slowly, but the effect of suppressing the current growth rate of this scheme is very small, and the applicability is poor; the other is to connect field effect crystals in series (referred to as MOS) tube, through the slow charging circuit to control the voltage rise between the gate and source (GS) of the MOS tube, and slowly turn on the MOS tube, but this solution is at the expense of the high current of the MOS tube, in the face of large-capacity energy storage unit, it is not enough to suppress the transient impact of voltage

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