Circuit for controlling a power supply voltage for a high-side gate driver
AssigneeTexas Instruments Incorporated
InventorIndumini W. Ranmuthu
Life of this patent
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Abstract
This disclosure describes techniques for controlling a power supply voltage for a high-side gate driver that is used in a power converter. In some examples, in response to an overvoltage condition that occurs on an input voltage lead of a power converter, a power converter may decouple a terminal of a charge pump capacitor from the input voltage lead, and couple the terminal of the capacitor to a reference voltage lead. In further examples, in response to an overvoltage condition that occurs on an input voltage lead of a power converter, a power converter may turn off both switching transistors.
Claims17
An integrated circuit comprising:
- an input voltage lead;
- a high-side gate drive output lead;
- a first charge pump capacitor lead;
- a second charge pump capacitor lead;
- a reference voltage lead;
- charge pump circuitry having an input, and an output coupled to the second charge pump capacitor lead;
- a gate driver having a control input, a power input coupled to the output of the charge pump circuitry, and an output coupled to the high-side gate drive output lead;
- a switching circuit having a control input, a first terminal coupled to the reference voltage lead, a second terminal coupled to the input voltage lead, and a third terminal coupled to the first charge pump capacitor lead;
- and
- an overvoltage detection circuit having an input coupled to the input voltage lead, and an output coupled to the control input of the switching circuit.
Dependencies are inferred from the claim text.