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| LTspice model for COB LED |
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| ocset:
Hi, Do you know how I can get a LTspice model for the LC019D and LC033D LEDs from Samsung? Ie something that gives the same I,V curve when a DC sweep is done? (pages 26,27 of datasheet) https://cdn.samsung.com/led/file/resource/2018/09/Data_Sheet_COB_D_Series_Gen.3_Rev.2.3.pdf I did the attached but its not accurate |
| Ian.M:
The curves in the datasheet don't have enough resolution so it will be difficult to fit a Berkeley SPICE diode model to them. Best option is always a manufacturer supplied model - *IF* LTspice can run it! If they don't offer a model, you can take one of the LEDs, run it at a very low current so you can count the number of dies, then make a best guess how many parallel strings, and how many dies per string to get instance parameter N for the simulated diode, then put it on a curve tracer (preferably one that can do low duty cycle pulsed measurements to avoid self-heating effects, divide the voltages measurements by N and apply the fitting procedure documented at the link below, and you can get a pretty decent model out of it. https://hackaday.io/project/12874-automated-ledlaser-diode-analysis-and-modeling/log/48368-estimating-spice-diode-models For a detailed explanation of the Berkeley SPICE diode model, and its parameters see: http://www3.imperial.ac.uk/pls/portallive/docs/1/7292572.PDF |
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