Lamp control device
AssigneeRohm Co., Ltd.
InventorMasaaki Nakayama
Life of this patent
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Abstract
A lamp control device includes: an output; a comparator; and a first setter configured to set the voltage fed to a first input terminal of the comparator to a second voltage that depends on a first voltage or to a third voltage that depends on a first current, in which the output terminal is connected to a second input terminal of the comparator, the output terminal is configured to be connectable to the lamp via a switch, the output terminal is configured to be connectable to a second setter including the switch, when the first setter sets the voltage fed to the first input terminal of the comparator to the second voltage, and the second setter is configured to set the voltage fed to the output terminal to a fourth voltage that depends on the first voltage and the resistance value of the switch.
Claims7
A lamp control device comprising:
- an output terminal configured to let a lamp driving current be output via it;
- a comparator;
- and
- a first setter configured to set the voltage fed to a first input terminal of the comparator to a second voltage that depends on a first voltage or to a third voltage that depends on a first current,
- wherein:
- the output terminal is connected to a second input terminal of the comparator,
- the output terminal is configured to be connectable to the lamp via a switch,
- the output terminal is configured to be connectable to a second setter including the switch,
- when the first setter sets the voltage fed to the first input terminal of the comparator to the second voltage, the second setter is configured to set the voltage fed to the output terminal to a fourth voltage that depends on the first voltage and the resistance value of the switch, and
- when the first setter sets the voltage fed to the first input terminal of the comparator to the third voltage, the second setter is configured to set the voltage fed to the output terminal to a fifth voltage that depends on the first current and the resistance value of the switch.
Dependencies are inferred from the claim text.