| CPC H03K 17/6871 (2013.01) [H03K 17/063 (2013.01); H03K 2217/0063 (2013.01); H03K 2217/0072 (2013.01)] | 6 Claims |
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1. A drive circuit for driving a bridge circuit having a high-side transistor connected between an input line and an output line and a low-side transistor connected between the output line and a ground line, the drive circuit comprising:
an output monitoring circuit that compares an output voltage generated on the output line with a threshold level based on an input voltage of the input line and generates an output detection signal indicating a comparative result, wherein
the output monitoring circuit includes
a first transistor, wherein
the first transistor has a drain that is connected to the input line, and
the first transistor has a gate that is subjected to application of a reference voltage higher than the output voltage by a predetermined voltage width,
a clamp element connected between a source of the first transistor and the output line,
a second transistor, wherein
the second transistor has a gate that is connected to the source of the first transistor, and
the second transistor has a source that is connected to the output line,
a first resistor, wherein
the first resistor has a first end that receives the reference voltage, and
the first resistor has a second end that is connected to a drain of the second transistor, and
a capacitor connected between the input line and the gate of the second transistor, and
the output detection signal is responsive to a signal at the drain of the second transistor.
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