CIRCUIT FOR CONTROLLING CURRENT TO LIGHT-EMITTING DIODE (LED)

摘要

The present invention discloses a current controlling circuit wherein the circuit (200) comprises a DC power source (202), an inductor (204), a N-channel Metal Oxide Semiconductor (NMOS) (206), one or more LEDs (208) connected in series, a first resistor (Rsense) and a switching arrangement (210). The positive terminal of the DC power source (202) is connected to the inductor (204) in series. The series of LED (208) is connected in series with the inductor (204) and the first resistor (Rsense). According to an embodiment the switching arrangement (210) comprises a second resistor (Rslt), a first switch (212) and a second switch (214). The second resistor (Rslt) is connected in series with the second switch (214) and connected in parallel with the first switch (212). The switching arrangement (210) is connected in series with the first resistor (Rsense) and the negative terminal of the DC supply (202).