Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
And a Vf of 0.7V refers to a silcon diode, not an LED.
There are some higher voltage LEDs but these are built using several series connected low-Vf junction in series within one package. There are some advantages and disadvantages to higher voltage types: For the same output power, the input current is lower when the voltage is increased and becasue the junctions are series connected, there is no need to use individual resistors to balance the current they draw. Given that in most applications the supply voltage will be higher than the LED voltage anyway, having to drop less voltage can simplify power supply design.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
