Multi-path high-speed broadband over-current detection circuit for load switch and control method

Abstract

The invention provides a multipath high-speed broadband over-current detection circuit for a load switch and a control method. A drive circuit module controls the on-off of the switch tube after internal conversion of the drive circuit, so that the on-off of the whole circuit is controlled, a circuit method of multipath control over-current detection is realized, and the detection of load currentin the circuit is more effective. The whole circuit is simple in design, can be completed by adopting a CMOS (Complementary Metal-Oxide-Semiconductor Transistor) process, is high in response speed andlarge in bandwidth, and can respond within 1 microsecond. Different current limit values can be set for the circuit at different temperatures, and the current limit value can be reduced when the temperature rises, so that the whole circuit is protected more effectively, and the power tube is prevented from being burnt and the whole chip is prevented from being damaged when the current is too large. A plurality of over-current detection points can be set according to the actual situation in the circuit, only corresponding detection circuits need to be added, and the circuit is simple and reliable.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a broadband overcurrent detection circuit. Background technique [0002] Most of the power supply products are now applied to load switches to protect power supply equipment, which requires that the load switches used have relevant functional requirements and good protection performance. When the power supply is working, regardless of the working environment of the chip or other reasons, the current of the power supply will change greatly. When the current is too large, it will affect the use of the power supply and may damage the power supply product more seriously. Sometimes it is necessary to set more An overcurrent detection point increases the design difficulty. To deal with the above problems, the current traditional method uses an overcurrent detection circuit to detect the large current or voltage flowing through the power tube to monitor the working state of the chip. The circu...

AI Technical Summary

Problems solved by technology

The circuit implementation of the traditional method is complex, the circuit detection response speed is not fast enough, the bandwidth is narrow, and the overall circuit cannot be effectively protected in real time, and the traditional process used takes up too much chip area and the cost is high

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