Temperature protection circuit for light-emitting diodes

Techniques are disclosed for regulating the temperature of a plurality of light-emitting diodes (LEDs) by monitoring the voltage drop across the LEDs. In one example, a driver circuit supplies a constant driver current to the LEDs. A temperature regulation circuit monitors the voltage drop across the LEDs to determine whether the junction temperature of the LEDs exceeds a maximum operating temperature. If the junction temperature of the LEDs exceeds the maximum operating temperature, the temperature regulation circuit uses digital pulse-width modulation (DPWM) to decrease a digital duty cycle of the driver current supplied to the LEDs. 本公开涉及用于发光二极管的温度保护电路。公开了通过监测跨发光二极管(LED)的电压降来调节多个LED的温度的技术。在个示例中，驱动电路向LED提供恒定的驱动电流。温度调节电路监测跨LED的电压降，以确定LED的结温是否超过最大操作温度。如果LED的结温超过最大操作温度，则温度调节电路使用数字脉冲宽度调制(DPWM)来减小提供给LED的驱动电流的数字占空比。