Overcurrent protection circuit and load driving device
AssigneeAblic Inc.
InventorKaoru SAKAGUCHI
Life of this patent
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Abstract
An overcurrent protection circuit configured to limit an output current flowing through an output transistor includes a sense transistor that provides a sense current proportional to the output current, a sense resistor through which the sense current flows, a current limiting circuit that detects a sense voltage generated by the sense resistor and controls a gate voltage of the output transistor, and a current correction circuit that provides the sense resistor with a corrected sense current added to the sense current based on a difference of voltage between a drain voltage of the output transistor and a drain voltage of the sense transistor.
Claims12
An overcurrent protection circuit configured to limit an output current flowing through an output transistor, the overcurrent protection circuit comprising:
- a sense transistor through which a sense current proportional to the output current flows;
- a sense resistor through which the sense current flows;
- a current limiting circuit that detects a sense voltage generated in the sense resistor and controls a gate voltage of the output transistor;
- and
- a current correction circuit that causes a corrected sense current added to the sense current to flow through the sense resistor based on a difference of voltage between a drain voltage of the output transistor and a drain voltage of the sense transistor.
Dependencies are inferred from the claim text.