soierr
Newbie level 2
Hello everyone. There some basic schema which I would like to clarify.
Having this, I'm trying to calculate resistance R1 in order to obtain proper voltage drop on the diode.
First of all, I open datasheet for this particular diode and look at the plot below.
Let's say, I choose VFM = 0.3V which corresponds 600 mA. (Consider, Tj = 25oC)
Now I can calculate resistor which is
R1 = (Usupp - VFM)/IF = (5 - 0.3)/0.6 = ~7.83 Ohm
So I have two questions:
Question1: Is this calculation correct ?
Question2: If this calculation correct then I have completely different probes as I simulate this schema
in proteus. See the picture below
Why is that ?
Having this, I'm trying to calculate resistance R1 in order to obtain proper voltage drop on the diode.
First of all, I open datasheet for this particular diode and look at the plot below.
Let's say, I choose VFM = 0.3V which corresponds 600 mA. (Consider, Tj = 25oC)
Now I can calculate resistor which is
R1 = (Usupp - VFM)/IF = (5 - 0.3)/0.6 = ~7.83 Ohm
So I have two questions:
Question1: Is this calculation correct ?
Question2: If this calculation correct then I have completely different probes as I simulate this schema
in proteus. See the picture below
Why is that ?