Over-temperature protection and enable control circuit

Abstract

The invention discloses an over-temperature protection and enable control circuit, and belongs to the field of integrated circuits. The over-temperature protection and enable control circuit comprises a positive temperature coefficient current generating circuit, an enable control circuit, an enable signal output circuit and a hysteresis circuit. The positive temperature coefficient current generating circuit generates positive temperature coefficient current and inputs the positive temperature coefficient current to the enabling control circuit; the enable control circuit receives an external enable signal, outputs an over-temperature signal, and generates a hysteresis signal to the positive temperature coefficient current generation circuit through the hysteresis circuit. And the enable control circuit outputs an enable control signal, and outputs an internal enable signal through the enable signal output circuit. The problem that an existing over-temperature protection and external enabling function circuit must be used in cooperation with a band-gap reference and a CMOS digital circuit is solved. The method is widely applied to the field of integrated circuit products which do not need band-gap reference, do not contain CMOS devices and need an over-temperature protection function and an external enabling function.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and in particular, relates to a circuit structure including over-temperature protection and external enabling functions. Background technique [0002] In order to avoid device damage caused by high temperature, many integrated circuit products, especially power integrated circuit products, need to have an over-temperature protection function, that is, most circuits in the product will not work when the temperature exceeds a certain temperature. In order to make integrated circuit products have a standby working mode, many integrated circuit products need to have an external enable function. Many power supply and power integrated circuit products require the above two functions at the same time. [0003] like figure 1 Shown, a common system architecture including over-temperature protection and external enable functions. Bandgap Reference 01 provides zero temperature coefficient voltage and p...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that existing over-temperature protection and external enabling function circuits must be matched with bandgap references and CMOS digital circuits, resulting in problems such as no need for bandgap References or integrated circuit products that do not contain CMOS devices but require over-temperature protection and external enable functions. The use of bandgap references will cause waste of power consumption and chip area, and the problem of low static power consumption cannot be achieved without CMOS devices.

In order to solve the problems of traditional circuits and realize over-temperature protection and external enabling functions with a simple and more adaptable circuit, the present invention provides a new circuit structure that does not rely on CMOS devices and does not require a bandgap reference

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