LED fault detection circuit and LED control circuit using the same

A light-emitting diode (LED) control circuit for controlling a plurality of LED strings, comprising:

• a plurality of LED driving circuits, wherein each LED driving circuit is coupled to a corresponding one of the LED strings;
• and
• an LED fault detection circuit, wherein through a plurality of switch units, the LED fault detection circuit is coupled between each of the LED strings and the LED driving circuits, and the LED fault detection circuit includes:
• a current source, providing a first current;
• a detection resistor, wherein through the switch units, a first end of the detection resistor is coupled to a node between each of the LED strings and the LED driving circuits, and a second end of the detection resistor is coupled to the current source;
• and
• a first circuit, coupled to the current source and the detection resistor;
• wherein after the LED strings are driven by the LED driving circuits, a detection current flows through the detection resistor when at least one LED of one of the LED strings forms a short circuit, the first circuit generates a fault detection signal according to the sum of the first current and the detection current, and one of the LED driving circuits continues to drive or stops driving the one of the LED strings according to the fault detection signal;
• wherein when at least one LED of the LED string forms a short circuit, a fault detection current generated by the first circuit is larger than a first preset current, and when the fault detection current is larger than or equal to a second preset current, the LED driving circuit stops driving the LED string according to the fault detection signal;
• and
• wherein the second preset current is larger than the first present current.