Automobile LED driving device
First Claim
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1. An automobile LED driving device comprising:
- a current setting portion to set multiple reference currents independently from one another for multiple respective current setting resistors connected externally,a current controller to select one of the multiple reference currents based on a control signal provided from outside, andan output transistor to control an output current to an automobile LED connected externally based on the reference current selected by the current controller, anda protect bus controller to generate a protect bus signal according to a detection of an abnormality and to perform an external input/output process for the protect bus signal,wherein the current controller controls a current supply to the automobile LED based on the protect bus signal.
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Abstract
An automobile LED driving device includes a current setting portion to set multiple reference currents independently from one another for multiple respective current setting resistors connected externally, a current controller to select one of the multiple reference currents based on a control signal provided from outside, and an output transistor to control an output current to an automobile LED connected externally based on the reference current selected by the current controller.
14 Citations
18 Claims
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1. An automobile LED driving device comprising:
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a current setting portion to set multiple reference currents independently from one another for multiple respective current setting resistors connected externally, a current controller to select one of the multiple reference currents based on a control signal provided from outside, and an output transistor to control an output current to an automobile LED connected externally based on the reference current selected by the current controller, and a protect bus controller to generate a protect bus signal according to a detection of an abnormality and to perform an external input/output process for the protect bus signal, wherein the current controller controls a current supply to the automobile LED based on the protect bus signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An automobile LED driving device comprising:
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a current setting portion to set multiple reference currents independently from one another for multiple respective current setting resistors connected externally, a current controller to select one of the multiple reference currents based on a control signal provided from outside, and an output transistor to control an output current to an automobile LED connected externally based on the reference current selected by the current controller, and a LED ground short detector to detect the ground short of the automobile LED, wherein the current controller turns OFF a supply of the output current forcibly when the ground short of the automobile LED occurs. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An automobile LED driving device comprising:
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a current setting portion to set multiple reference currents independently from one another for multiple respective current setting resistors connected externally, a current controller to select one of the multiple reference currents based on a control signal provided from outside, and an output transistor to control an output current to an automobile LED connected externally based on the reference current selected by the current controller, wherein the current setting portion generates multiple current setting voltages by flowing constant currents to the multiple respective current setting resistors, and generates multiple reference currents by applying the multiple current setting voltages to respective internal resistors, and wherein negative characteristic thermistors are connected in parallel to the respective current setting resistors.
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17. An automobile LED driving device comprising:
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a current setting portion to set multiple reference currents independently from one another for multiple respective current setting resistors connected externally, a current controller to select one of the multiple reference currents based on a control signal provided from outside, and an output transistor to control an output current to an automobile LED connected externally based on the reference current selected by the current controller, wherein the current controller comprises; an input transistor forming a current mirror circuit with the output transistor and generating a mirror current to the output transistor according to the reference current provided to the input transistor. - View Dependent Claims (18)
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Specification