LED Driver is a kind of power supply, it is a device that provides power to electronic equipment, and it is also called power supply. It is a device that converts alternating current into direct current through a transformer and a rectifier. This device is called a rectifier power supply, also known as a driving power supply. An electronic device that can provide a signal is called a signal source.  The LED Driver is a constant current source, and the general switching power supply is a constant voltage source.Working principle: LED has two requirements for power supply. First, the output voltage is required to be greater than the on-voltage of the LED, and the second is to require the working current to be stable and not greater than the rated current of the LED. When the operating current of the LED exceeds the rated current, the LED will quickly age and damage. Therefore, the LED Driver used by the LED must have a constant current function.