High-side driver circuit

A high-side driver circuit in which a first potential is set as a power supply potential, comprising:

• a constant voltage circuit configured to operate with a second potential as a reference for the constant voltage circuit, and generate, from the first potential, a third potential which is lower than the first potential and higher than the second potential;
• a logic circuit configured to operate with the third potential as a reference for the logic circuit;
• a level shift circuit configured to receive an output signal of the logic circuit and shift the reference of the output signal from the third potential to the second potential;
• a driver circuit in which the second potential shifted by the level shift circuit is set as a reference of the driver circuit, and configured to drive a switching element by the output signal of the logic circuit;
• and
• a high voltage level shift circuit configured to shift a level of an input signal from a low side to a high side and input the input signal to the logic circuit, wherein
• the high voltage level shift circuit includes
• a first switching element, a gate of which receives the input signal,
• a second switching element, a drain of which is connected to a drain of the first switching element and a source of which is connected to the first potential, and
• a diode, a cathode of which is connected to a drain of the second switching element and an anode of which is connected to the second potential.

A high-side driver circuit in which a first potential is set as a power supply potential, comprising:

• a constant voltage circuit configured to operate with a second potential as a reference for the constant voltage circuit, and generate, from the first potential, a third potential which is lower than the first potential and higher than the second potential;
• a logic circuit configured to operate with the third potential as a reference for the logic circuit;
• a level shift circuit configured to receive an output signal of the logic circuit and shift the reference of the output signal from the third potential to the second potential;
• a driver circuit in which the second potential shifted by the level shift circuit is set as a reference of the driver circuit, and configured to drive a switching element by the output signal of the logic circuit;
• and
• a high voltage level shift circuit configured to shift a level of an input signal from a low side to a high side and input the input signal to the logic circuit, wherein
• the high voltage level shift circuit includes
• a first switching element, a gate of which receives the input signal,
• a second switching element, a drain of which is connected to a drain of the first switching element and a source of which is connected to the first potential, and
• a Zener diode, an anode of which is connected to a drain of the second switching element and a cathode of which is connected to the second potential.