Configurable over-temperature protection circuit applied to switching power supply
A technology of over-temperature protection circuit and switching power supply, applied in emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., can solve problems such as hazards, chip damage, long-term high temperature, etc., to improve the application range and improve The effect of configuration precision
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[0026] figure 1 It is a system block diagram of the over-temperature protection circuit of the present invention, including a bias circuit, an over-temperature detection module, and a trimming circuit. Under the action of the power supply voltage, the bias circuit obtains a bias current that has nothing to do with the power supply voltage, and outputs it to the over-temperature detection module, the power supply voltage is the working voltage of the switching power supply. The trimming circuit receives the power supply voltage and the trimming voltage input from the outside, obtains a trimming signal according to the trimming voltage, and outputs it to the over-temperature detection module. The over-temperature detection module receives the power supply voltage, the bias current output by the bias circuit and the trimming signal output by the trimming circuit, and outputs a high level to the switching power supply drive module according to the power supply voltage and the bias...
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