Inverting buck-boost converter drive circuit and method
AssigneeSTMicroelectronics (Shenzhen) R&D Co. Ltd
InventorsHai Bo Zhang, Jerry Huang
Life of this patent
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Abstract
A driver circuit includes a high-side power transistor having a source-drain path coupled between a first node and a second node and a low-side power transistor having a source-drain path coupled between the second node and a third node. A high-side drive circuit, having an input configured to receive a drive signal, includes an output configured to drive a control terminal of said high-side power transistor. The high-side drive circuit is configured to operate as a capacitive driver. A low-side drive circuit, having an input configured to receive a complement drive signal, includes an output configured to drive a control terminal of said low-side power transistor. The low-side drive circuit is configured to operate as a level-shifting driver.
Claims23
A circuit, comprising:
- a power transistor having a drain terminal coupled to a input node and a source terminal coupled to an output node;
- a drive circuit having an input configured to receive a drive signal and an output configured to output a first control signal;
- a first capacitor having a first terminal coupled to receive the first control signal from the drive circuit and a second terminal coupled to an intermediate node;
- a diode having an anode coupled to the input node and a cathode coupled to the intermediate node;
- and
- a circuit path coupling the intermediate node to a gate terminal of the power transistor.
A circuit, comprising:
- a power transistor having a drain terminal coupled to an input node and a source terminal coupled to an output node;
- a drive circuit having an input configured to receive a drive signal and an output configured to output a first control signal;
- an inverter circuit configured to invert the first control signal and generate a second control signal;
- a first capacitor having a first terminal coupled to receive the first control signal from the drive circuit and a second terminal coupled to a gate of said power transistor;
- and
- a first transistor having a drain terminal coupled to the gate of the power transistor and a source terminal coupled to the source terminal of the power transistor, said first transistor having a gate terminal driven in response to said second control signal.
Dependencies are inferred from the claim text.