- Due to the nature of a buck regulator, the input voltage to the driver must always be higher than the total forward voltage drop of all series connected LEDs. For example, if you have a series connected string of six LEDs where each LED has an average forward drop of 3.5V, the required minimum input voltage would be 25VAC. (3.5 x 6 + 4) A 26VAC power supply would be a good choice for this application.
- The actual value will vary greatly depending on the input and/or output voltages. Value shown is for Vin = 24VDC VOUTt=20VDC LED load. Actual values will be smaller in most applications.
- This information is for reference only. Refer to the manufacturers datasheet for official specifications.