The step-up or step-down type is determined by the relationship between the supply voltage and the LED load voltage. If the supply voltage is lower than the load voltage, use the boost type; If the supply voltage is higher than the load voltage, use the step-down type. The forward voltage of an LED is determined by its forward current. It can be seen from the voltammetric characteristics of LED that the change of forward current will cause the corresponding change of forward voltage. To be exact, the decrease of forward current will also cause the decrease of forward voltage. So when the current is turned down, the forward voltage of the LED is also lowered. This changes the relationship between the supply voltage and the load voltage. For example, in a 24V input LED lamp, eight 1W high-power LEDS are connected in series. At a forward current of 350mA, the forward voltage of each LED is 3.3V.

Common-Cathode CC 3021AW 7-Segment digit 3021AW LED Common-Anode CA 3021BW Display 3021BW 0.30 inch
Common-Cathode CC 3022AW 7-Segment digit 3022AW LED Common-Anode CA 3022BW Display 3022BW 0.30 inch


The light source with Ra 100 value
The standby LED lighting of emergency
LED light source index and average life
LED incandescent lamp color response
Color performance of LED light source
Color temperature LED source irradiation
Change the brightness of the LED
LED chips provide control voltage interface
In the RGB LED system
LED supply voltage and load voltage