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US 8,786,208 B2Granted
Electronic device for driving light emitting diodes
AssigneeNXP B.V.
InventorsGian Hoogzaad, Frans Pansier
Life of this patent
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Abstract
The present invention relates to an electronic device for driving a light emitting diode, which includes a switch (Ts) being adapted to switch a switch-mode power converter, and controlling means (CNTL) being adapted for controlling the switch (Ts) in response to a sensing value (Vs) indicative of a current of the switch-mode power converter and for controlling by the switch (Ts) the output voltage of the switched power converter and a current (Iout) through the light emitting diode.
Claims9
An electronic device for driving one or more light emitting diodes, the electronic device comprising:
- a control switch configured and arranged to switch a switch-mode power converter that produces an output voltage across the one or more light emitting diodes;
- a current sensor for sensing a current provided by the switch-mode power converter, wherein the sensed current is indicative of an amount of current passing through the control switch,
- a reference voltage generator circuit configured and arranged to generate a reference voltage in response to a variable input signal, that varies as a function of the output voltage, and
- a control circuit configured and arranged to control the control switch, in response to a comparison of the sensed current and the reference voltage.
1 more element
Dependencies are inferred from the claim text.