Gate driver circuit, motor driver circuit, and hard disk apparatus
AssigneeRohm Co., Ltd.
InventorHisashi SUGIE
Life of this patent
Estimating the term…
Abstract
A gate driver circuit drives a switching transistor. A variable current source generates a reference current configured to switch between a first current amount and a second current amount smaller than the first current amount. A current distribution circuit is configured to switch between a source enabled state in which a source current proportional to the reference current is sourced to a gate node of the switching transistor and a disabled state in which the source current is made equal to zero. A first transistor fixes the gate node of the switching transistor to a high voltage in an on-state of the first transistor. A second transistor fixes the gate node of the switching transistor to a low voltage in an on-state of the second transistor.
Claims14
A gate driver circuit that drives a switching transistor, comprising:
- a variable current source that generates a reference current configured to switch between a first current amount and a second current amount smaller than the first current amount;
- a current distribution circuit configured to switch between a source enabled state in which a source current proportional to the reference current is sourced to a gate node of the switching transistor and a disabled state in which the source current is made equal to zero;
- a first transistor that fixes the gate node of the switching transistor to a high voltage in an on-state of the first transistor;
- and
- a second transistor that fixes the gate node of the switching transistor to a low voltage in an on-state of the second transistor.
A gate driver circuit that drives a switching transistor, comprising:
- a variable current source that generates a reference current configured to switch between a first current amount and a second current amount smaller than the first current amount;
- a current distribution circuit configured to switch between a sink enabled state in which a sink current proportional to the reference current is sunk from a gate node of the switching transistor and a disabled state in which the sink current is made equal to zero;
- a first transistor that fixes the gate node of the switching transistor to a high voltage in an on-state of the first transistor;
- and
- a second transistor that fixes the gate node of the switching transistor to a low voltage in an on-state of the second transistor.
Dependencies are inferred from the claim text.