Led driving device, illuminator, and liquid crystal display device
AssigneeRohm Co., Ltd.
InventorsRyosuke Kanemitsu, Masaaki Nakayama
Life of this patent
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Abstract
The present invention provides a light emitting diode (LED) driving device as a semiconductor device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an LED short-circuit detection circuit, for monitoring a cathode voltage of the LED to perform an LED short-circuit detection, wherein the LED short-circuit detection circuit controls whether an action is performed or not according to a short-circuit detection enable signal input from outside the LED driving device.
Claims9
1-6. (canceled)
A light emitting diode (LED) driving device, comprising:
- a direct current/direct current (DC/DC) controller configured to control an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED;
- an output current driver configured to generate an output current of the LED;
- and
- an LED short-circuit detection circuit configured to monitor a cathode voltage of the LED to perform an LED short-circuit detection;
- a short-circuit detection signal input terminal arranged to input a short-circuit detection enable signal, the short-circuit detection enable signal is used for controlling whether an LED short-circuit detection action is performed or not,
- wherein the LED short-circuit detection circuit is operable to control whether or not an action is performed according to the short-circuit detection enable signal input from outside the LED driving device,
- wherein the LED short-circuit detection circuit comprises a comparator operable to compare the cathode voltage of the LED and a predetermined threshold voltage, and operable to control whether or not the action is performed according to the short-circuit detection enable signal.
Dependencies are inferred from the claim text.