The difference between LED constant current and constant voltage driver chip:
1, the constant current drive output current is constant, and the output DC voltage with the load resistance value is different in a certain range, the load resistance value is small, the output voltage is low, the greater the load resistance value, the higher the output voltage; The output voltage of the constant current drive is fixed, and the output current changes with the increase or decrease of the load.
2, constant current drive is not afraid of load short circuit, but it is strictly prohibited to completely open the load; Constant voltage drive is not afraid of load open circuit, but it is strictly prohibited that the load is completely short circuit.
3, the maximum current and voltage value used by the constant current drive, which limits the number of leds used; Constant voltage drive each series needs to add a suitable resistor to make each series of LED display brightness average, brightness will be affected by the voltage change from rectification. LED drive power supply is to convert the power supply into a specific voltage and current to drive LED light power converter, constant current drive is more ideal, but relatively high price.