Patent ID: 11919441
Assignee: ROHM CO., LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B  H  Y | IPC B  H

Claim 0:
1. A lamp control device comprising:
a first input terminal;
a second input terminal;
an output terminal configured to be connectable to a lamp via an external switch, a driving current for the lamp being output via the output terminal;
an internal switch arranged on a first path connecting together the first input terminal and the output terminal;
a constant current circuit arranged on a second path connecting together the second input terminal and the output terminal;
a voltage monitor configured to monitor a voltage fed to the output terminal; and
a controller configured to control the internal switch based on a result of monitoring by the voltage monitor,
wherein the controller is configured to start switching alternately between first and second control modes when the voltage fed to the output terminal is lower than a first predetermined value.