OUTPUT CIRCUIT

摘要

There is provided an output circuit for supplying an output current to a load coupled to an output terminal in response to an input signal. The output circuit includes an output transistor for supplying the output current to the output terminal, an output-drive circuit for driving the output transistor, a constant-current limiting circuit for generating a current control signal for limiting the output current to a predetermined current value, and a control circuit for implementing a control such that the output current is controlled on the basis of the current control signal if a voltage at the output terminal is at a predetermined voltage, or less after the input signal is supplied while the output transistor is driven by the output-drive circuit if the voltage at the output terminal is in excess of the predetermined voltage.

主权项

1. A Light Emitting Diode (LED) drive circuit, comprising:
an output circuit that outputs one of a first current and a second current to a LED circuit, the first current having a predetermined current value and the second current having a current value higher than the predetermined current value; and a short-circuit detection circuit that detects a short circuit at the LED circuit, wherein the output circuit outputs the first current based on a control signal, wherein the output circuit switches to output the second current when the short-circuit detection circuit does not detect the short circuit after the first current is outputted, wherein the output circuit switches to output the first current when the short-circuit detection circuit detects the short circuit after the second current is outputted, and wherein the output circuit switches to output the second current when the short circuit is cancelled.