LIGHT EMITTING DIODE THERMAL FOLDBACK CONTROL DEVICE AND METHOD

摘要

A thermal foldback control circuit electrically connected to a light emitting diode (LED) driver. The thermal foldback control circuit includes a voltage divider and a shunt regulator. The voltage divider includes a first resistor component, a second resistor component in a series-type configuration with the first resistor component, and an output. The first resistor component has a first resistance and the second resistor component has a second resistance that varies in response to a temperature at a reference point. The output is configured to output a reference voltage based on the first resistance and the second resistance. The shunt regulator is in a parallel-type configuration with the voltage divider and is configured to receive the reference voltage and control a driver output of the LED driver based on the reference voltage.

主权项

1. A thermal foldback control circuit electrically connected to a light emitting diode (LED) driver, the thermal foldback control circuit comprising:
a voltage divider including
a first resistor component having a first resistance,a second resistor component in a series-type configuration with the first resistor component, the second resistor component having a second resistance that varies in response to a temperature at a reference point, andan output configured to output a reference voltage based on the first resistance and the second resistance; and a shunt regulator in a parallel-type configuration with the voltage divider, the shunt regulator configured to
receive the reference voltage, andcontrol a driver output of the LED driver based on the reference voltage.