How to control the heat of LED

If you only use a simple bias resistance control drive current, VF will decrease with the temperature increasing, the drive current will increase. Especially for the high power LED, it will cause the thermal breakdown and the component failure.

The common practice is to accelerate the thermal conductivity by installing the LED in the metal core printed circuit board(PCB), so as to control the junction temperature. Wire coupled transient and surge will can also reduce the LED life, many LED drive device can be easily damaged because of the DC voltage and polarity errors, the output of LED drive device can be also damaged or destroyed due to the short current. Most of the LED drive device contains the built-in security features, including the thermal shutdown and LED open circuit and short circuit detection. However, to protect IC and other sensitive electronic components, it may need the additional overcurrent protection components.