Chip thermostatic control method and its over temperature protective circuit

Abstract

The present invention relates to a thermostatic control method for a chip and an over-temperature protecting circuit thereof, belonging to the power integrated power management IC chip field. The method converts the dissipating power generated by output current of the chip into variation of the internal temperature of the chip through a thermal resistor. Afterwards, the variation of the temperature of the chip is converted into variation of a voltage signal. After the voltage signal is amplified, the output current of the chip is controlled so that the dissipating power of the chip is adjusted and the thermostatic control of the chip is realized. The over-temperature protecting circuit is a closed loop control system formed by a temperature detecting circuit, a constant temperature amplifier and a power-to-temperature converting module. The method quantizes the entire process of 'temperature variation' of the chip by the transmission function of a continuous time domain so as to design a temperature adjusting circuit based on the closed-loop control. The method and the circuit realize that the maximization of the output power is ensured on the premise that the chip has no overheat risk when the chip requires overheat protection.

Description

technical field [0001] The invention relates to the field of power integrated power supply management IC chips, in particular to a chip constant temperature control method and an over-temperature protection circuit thereof. Background technique [0002] With the continuous improvement of IC chip integration density and power density, power dissipation becomes a key factor affecting the stable operation of IC chips. Because the dissipated power is transmitted to the surrounding environment, there is a certain thermal resistance, which will inevitably lead to an increase in the temperature of the chip. Obviously, the larger the output power, the higher the power dissipation and the more significant the temperature rise of the chip. Therefore, the overheat protection circuit is very important for the power integrated power management circuit. It is necessary to protect it from overheating so as not to burn the whole chip. Conventional over-temperature protection circuit is to...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a chip constant temperature control method and its over-temperature protection circuit for the problems existing in the actual application of the existing over-temperature protection circuit, so as to realize the constant-temperature working function of the chip when over-heat protection is required

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