Load open circuit detection circuit and method for high-side switch

The invention discloses a load open circuit detection circuit and method for a high-side switch. The circuit includes a voltage comparator, a voltage acquisition circuit, a current source, a detection resistor and a threshold setting circuit; the current source is connected in parallel with two ends of a high-side switch to be tested; the high-side switch to be tested is connected in series with a load; the detection resistor is commonly connected with the current source and the high-side switch to be tested; the connecting point of the detection resistor, the current source and the high-side switch to be tested is connected with the input end of the voltage acquisition circuit; the output end of the voltage acquisition circuit is connected with the reverse input end of the voltage comparator; the threshold setting circuit is connected with the forward input end of the voltage comparator; and the output end of the voltage comparator is adopted as the output end of the load open circuit detection circuit and i