Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

LTspice model for COB LED

Status
Not open for further replies.

treez

Advanced Member level 5
Joined
Sep 22, 2008
Messages
7,568
Helped
561
Reputation
1,125
Reaction score
537
Trophy points
1,393
Location
cambridge
Activity points
76,188

Attachments


BradtheRad

Super Moderator
Staff member
Joined
Apr 1, 2011
Messages
13,730
Helped
2,718
Reputation
5,432
Reaction score
2,635
Trophy points
1,393
Location
Minneapolis, Minnesota, USA
Activity points
102,463
The graph shows the LC019D conducting 1A at 37V.
Starting out with a simulation, I changed the led to that spec, but it makes the curve too steep (because the led equation is exponential). However by combining a series resistor, it makes the slope more linear and more gradual. I used trial-and-error. because it's not obvious how to derive an equation from the curve.

led 33V plus series 4 ohm resistor resemble hi-V led.png

The led conducts 1A @33V. The 4.4 ohm resistor adds another 4.4V @1A.
Over a range of 31 to 39V, current draw goes from 94mA to 1.3A. The curves are similar.
 
  • Like
Reactions: treez

    treez

    points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top