| 摘要 |
A circuit for driving light emitting diodes (LEDs) includes a first semiconductor switch and a freewheeling device coupled between a first supply terminal that provides a supply voltage and a second supply terminal that provides a reference potential. The first semiconductor switch is responsive to a driver signal. An LED and an inductor are coupled in series between a common circuit node of the first semiconductor switch and the freewheeling device and either the first supply terminal or the second supply terminal. A current measurement circuit is coupled to the LED and provides a load current signal which represents a load current passing through the at least one LED. A first feedback circuit includes an on-off controller that receives load current signal and a reference signal. |
