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Re: gEDA-user: LED in reverse
Karel Kulhavy wrote:
Do you know at which voltage a typical red LED breaks down in reverse? 100V?
Nope, 5v, and some are as low as 3v.
What happens when the diode is charged slowly with a current source of say
0.5mA until it breaks down and it's internal capacitance discharges by
avalanche? Will it blink or stay dark in the process?
Avalanche is a function of voltage, not current. A diode won't conduct
significant current until the max. Vr is exceeded.
Wikipedia says an avalanche reaches maximum in picoseconds. If the avalanche
shines, does the light generated reach maximum in picoseconds as well?
Yep, things will happen in a hurry, whether it emits any light, I don't
know.
Take a look at this spec. sheet, you can see max Vr is 5v, and max Ir,
is 10 microamps.
http://www.ledsupply.com/l2-0-r5th20-1.php
--
Darryl Gibson N2DIY
RLU X 182668/379552
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