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difference between Constant current LED driver and Constant voltage LED driver

This page compares Constant current LED driver vs Constant voltage LED driver and mentiones difference between Constant current LED driver and Constant voltage LED driver.

Constant current LED driver

constant current LED driver

• This type of driver is used to power LEDs which require fixed output current and voltage range is specified.
•  As shown in the figure-1, constant current is 700 mA and output voltage range is 4 to 13 V DC.
• In this LED driver, usually only one output current is mentioned in units of Amps or milliamps along with voltage range which vary based on wattage of LED.

Constant voltage LED driver

constant voltage LED driver

• This type of driver is used to power LEDs which require fixed output voltage and maximum current is specified.
• As shown in the figure-2, constant voltage is 24V DC and output current is 1.04Amp (maximum).
• In this LED driver, usually one stable voltage is used and not range of voltage.
• Here, current is regulated either using resistors or using internal constant current driver within this LED module.

AC LED Driver

There is also another type of LED driver known as AC LED driver. It is no-minimum load transformer. This means it can be used to operate low-voltage halogen or incandescent bulbs also. AC LED driver is used with bulbs which already has an internal driver. This internal driver converts AC current to DC current. Hence job of AC LED driver is to register low wattage of LEDs and consecutively step down voltage to meet voltage requirement of the bulb (usually 12 or 24 volts).


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