Linked Questions

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1answer
4k views

How to model IR LED Diode in SPICE [duplicate]

How does one model an IR diode in SPICE? Specifically, the TIL38. Datasheet here: http://www.supermoduul.com/PDF/TIL38.pdf I get it that Is needs to be found - ...
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11answers
31k views

What happens if an LED is connected to a supply voltage greater than its voltage drop?

My understanding of resistance and voltage is horrible. I heard that with Kirchhoff's law, (in my words, please correct) the voltage used by the circuit must equal the voltage supplied. For example, ...
6
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2answers
13k views

Simple LED model for circuit simulation

I'm new to electronics and I'm learning the basics for a small home project involving LEDs, fiber optics, and microcontrollers. I'd like to simulate the circuit I plan to build to get a better ...
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4answers
1k views

How to improve my curve fitting for an LED in spice

I have an LED that I'm working with, actually it's not a discrete part but on silicon. Anyway all I have is a curve for it and I was trying to work up a spice model in LT-spice. I followed this ...
2
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1answer
3k views

LED modeling with Shockley diode equation

I'm working on a project where I need to model the voltage/current relationship of various LEDs. I'm wondering what values I would need to use for the saturation current in the Shockley diode ...
2
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1answer
1k views

How do I model an LED with SPICE WITHOUT access to a Manufacturer's Datasheet

Looking to create a model of an LED (RL5-WW15030 from Superbrightleds.com): https://www.superbrightleds.com/moreinfo/component-leds/5mm-warm-white-led-30-degree-viewing-angle-15000-mcd/263/1190/#/tab/...
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1answer
1k views

Is it possible to calculate a diode's V-I curve?

the other day I was confused because I din't get how an led has different voltage drop's depending on the resistance of a resistor and the voltage supplied by the battery. But then someone answered my ...
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2answers
356 views

Charlieplexing: a LED producing light very slightly, although it shoudln't, based on its forward voltage

I have a display of a few LEDs, using charlieplexing: The display devices don't have any other parts, and don't have any space to place any parts either. The resistors are on the wires A, B and C ...
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3answers
147 views

Capacitor not reaching supply voltage with LED in series

Totally new to electronics here. Without the red LED "charging indicator", the capacitor charges fully to 10V, but with the diode the capacitor maxes out at about 8.42V. I don't understand why the ...
1
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2answers
97 views

Need help on building a passive Dim-to-Warm LED array

I have started a project for my home lighting, I'm trying to build a DC LED module which would change the color temperature from 3000K to 1800K as dimmed with reducing current. I'd like to do it ...
1
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1answer
38 views

How do you use an LED's log V/I curve to force an exponential current change in the LED for a linear voltage change?

The info needed to make log and exponential converters with silicon is widely available. The saturation current, intrinsic resistances, and the Ebers-Moll equation are sufficient. A few other numbers ...