Over-voltage protection circuit for boosting-type switching power supply
A technology of overvoltage protection circuit and switching power supply, which is applied in the direction of emergency protection circuit devices, electrical components, and adjustment of electrical variables, etc. It can solve the problems of large chip area, large chip power consumption, increased chip cost, etc., and save chip pins , cost optimization, and the effect of reducing packaging costs
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[0021] Describe the specific working conditions of the present invention below with reference to accompanying drawing.
[0022] image 3 It is a functional block diagram of the present invention. It includes a sampling step-down circuit 1, which is used to sample the drain voltage of the switching MOS tube in the step-up switching power supply chip to test whether the output voltage is overvoltage; the output of the sampling step-down circuit 1 is connected to the voltage divider circuit 2 The input terminal of the sampling step-down circuit 1 further divides the voltage, because the reverse breakdown voltage of the diode is relatively fixed, so the voltage dividing circuit 1 further divides the result to the reference voltage of the reference voltage circuit 5 The comparison range; the divided output voltage is sent to the voltage comparator 3 for comparing the result of the voltage dividing circuit 2 with the reference voltage circuit 4, and the output result of the voltage...
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Abstract
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