LED driving circuit
AssigneesSemiconductor Components Industries, LLC, Sanyo Semiconductor Co., Ltd.
InventorYoshiaki Yonezawa
Life of this patent
Estimating the term…
Abstract
An LED driving circuit includes: a current generating circuit configured to generate a drive current corresponding to a voltage level of a drive voltage applied to anodes of the first to fourth LEDs so as to alternately drive the first and second LEDs and the third and fourth LEDs; a first drive control circuit connected to cathodes of the first and third LEDs, and configured to drive the first or third LED with the drive current in response to a first control signal for controlling driving of the first or third LED; and a second drive control circuit connected to cathodes of the second and fourth LEDs, and configured to drive the second or fourth LED with the drive current in response to a second control signal for controlling driving of the second or fourth LED.
Claims5
An LED driving circuit for driving first to fourth LEDs, comprising:
- a current generating circuit configured to generate a drive current corresponding to a voltage level of a drive voltage applied to anodes of the first to fourth LEDs so as to alternately drive the first and second LEDs and the third and fourth LEDs;
- a first drive control circuit connected to cathodes of the first and third LEDs, and configured to drive the first or third LED with the drive current in response to a first control signal for controlling driving of the first or third LED;
- and
- a second drive control circuit connected to cathodes of the second and fourth LEDs, and configured to drive the second or fourth LED with the drive current in response to a second control signal for controlling driving of the second or fourth LED.
Dependencies are inferred from the claim text.