LED 驱动器照明指南

    Regardless of type, color, size, or power, all LEDs work best when driven with a constant current. LED manufacturers specify the characteristics (such as lumens, beam pattern, color) of their devices at a specifi ed forward current (I

F), not at a specifi c forward voltage (VF).Most power supply ICs are designed to provide constant voltage outputs over a range of currents (see below); hence, it can be diffi cult to ascertain which parts will work for a given application

from the device datasheet alone. With an array of LEDs, the main challenge is to ensure every LED in the array is driven with the same current. Placing all the LEDs in a series string ensures that exactly the same current fl ows through each device.