| 摘要 |
LED driver circuit for powering at least one LED string comprises: at least one lighting switching element (TLEDA; TLEDB), connected to the LED string and operable to switch at least between an inactive state, in which it prevents the passage of a driver current (ILED) into said LED string, and an active state, in which it imposes a driver current (ILED) through said LED string, The driver current is dependent on a driver voltage (Vref) applied to the lighting switching element. The circuit further comprises switch driver circuit means (10, 20, 40) suitable for generating a driver voltage (Vref) which depends in a substantially linear manner on the power supply voltage (VDD). |
