Feedback type control circuit for current output curve of MOS (Metal Oxide Semiconductor) channel in wide temperature scope

Abstract

The invention relates to a feedback type control circuit for a current output curve of a MOS (Metal Oxide Semiconductor) channel in a wide temperature scope. The control circuit comprises a heat-sensitive sensor, a main circuit operation amplifier and a MOS tube, wherein the heat-sensitive sensor is a negative temperature coefficient sensor; when temperature rises, an output voltage of the heat-sensitive sensor is reduced; and when temperature reduces, the output voltage of the heat-sensitive sensor is increased. The feedback type control circuit for the current output curve of the MOS channel in the wide temperature scope provided by the invention causes a temperature characteristic curve of the heat-sensitive sensor to be consistent with a practical required curve of the output current and increases the accuracy of the current output curve; a subordinate circuit load is protected against damage caused by over-limit current through a reliable output current limiting measure under the condition that the current exceeds the use condition scope; and a plurality of resistors are used for controlling the characteristics, such as slope, height, and the like, of the current output curve, so that the current output curve is accurately matched, the debugging difficulty is reduced and the volume production for the circuit is benefited.

Description

technical field [0001] The invention relates to a feedback type current output control circuit, in particular to a feedback type wide temperature range MOS channel current output curve control circuit. Background technique [0002] The working environment of industrial electromechanical equipment is harsher than that of civilian consumer electronics, and generally requires an operating temperature range of -40°C to +85°C. Electronic components in electromechanical equipment are generally temperature-sensitive, and are easily affected within this temperature range, resulting in unstable working conditions. The unstable working state of an input component may cause the circuit state to exceed the limit expected by the design after multi-stage amplification of the subsequent circuit, resulting in the failure of the entire circuit. In order to improve this kind of failure, circuit design generally considers the limit of the operating temperature of electronic components. If it ...

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Problems solved by technology

[0008] The invention provides a feedback type wide temperature range MOS channel current output curve control circuit, which is used to solve the inconsistency between the temperature characteristic curve of the thermal sensor and the actual demand curve of the output current in the prior art, and there is no reliable output current limiting measure. Debugging is more difficult due to more parameters and has a greater impact on the performance consistency of mass-produced circuits

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