The specs can either be "typical" or "maximum". The data sheet usually has a typical curve showing VF versus current.I got the diode forward voltage drop in the datasheet, which is 3.5V@If=30A. I didn't get any profile about the current vs voltage drop in the datasheet. Now I would like to know how to estimate the drop voltage if If=10A is used in my design.
I don't think this method will yield accurate values. Here is a VF curve for a high current silicon rectifier:You can very roughly estimate it as being linear, starting at 0.7V for low current.
3.5 - 0.7 = 2.8V
/3 (for 10A) = approx 0.9
add back the 0.7 = 1.6V
So roughly 1.6V @ 10A for about 16W dissipation.
Could be wrong, but I don't think he's talking about an LED.Can you provide the part number of the LED?
hgmjr
I'm not sure either. Based on the OP, it could go either way...Could be wrong, but I don't think he's talking about an LED.
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