Half-bridge driver circuit, related integrated circuit, half-bridge switching circuit and method

A half-bridge driver circuit, comprising:

• a first node configured to be coupled to an intermediate node between a high-side electronic switch and a low-side electronic switch of a half-bridge driven by the half-bridge driver circuit, the high-side electronic switch being coupled to receive a first supply voltage and the low-side electronic switch being coupled to receive a reference voltage, a voltage at the first node representing a floating reference voltage;
• a second node configured to be coupled via a capacitor to the first node;
• positive and negative power supply terminals for receiving a second supply voltage;
• a charge circuit configured to provide a charge current to the second node in response to a voltage at the second node being smaller than the second supply voltage, wherein the second node provides a floating supply voltage that is floating with the floating reference voltage at the first node;
• a high-side driver configured to drive a control terminal of the high-side electronic switch, wherein the high-side driver is supplied by the floating supply voltage;
• a low-side driver configured to drive a control terminal of the low-side electronic switch, wherein the low-side driver is supplied by the second supply voltage;
• and
• a detector circuit configured to generate a signal indicating whether the floating reference voltage at the first node is greater than the second supply voltage, wherein the detector circuit includes a first circuit including:
• a resistance coupled between the second supply voltage and the floating reference voltage;
• and
• a first comparator circuit configured to monitor a voltage drop at the resistance and to set a first control signal to either a first logic level or a second logic level based on the voltage drop.