White LED Spice Model
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From: Jim Thompson on 15 Jan 2010 11:23 Here's a white LED Spice model that I created by fitting to data points of a real device. Unfortunately I've misplaced which actual device number it was :-( ****************************************************************** **** My White LED **** ..SUBCKT MyWhiteLED A K D_D1 N_1 0 D1N4148 F_F1 N_3 K VF_F1 1 VF_F1 N_2 N_1 0V E_E1 N_2 0 N_3 K 0.228 R_R1 A N_3 5 ..ENDS MyWhiteLED ****************************************************************** Schematic and PSpice simulation results at... Newsgroups: alt.binaries.schematics.electronic Message-ID: <qo41l5llt9mtna5bepi6facrf03p4p7l7s(a)4ax.com> ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: Jim Thompson on 15 Jan 2010 16:45 On Fri, 15 Jan 2010 09:23:10 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com/Snicker> wrote: >Here's a white LED Spice model that I created by fitting to data >points of a real device. Unfortunately I've misplaced which actual >device number it was :-( > >****************************************************************** >**** My White LED **** >.SUBCKT MyWhiteLED A K >D_D1 N_1 0 D1N4148 >F_F1 N_3 K VF_F1 1 >VF_F1 N_2 N_1 0V >E_E1 N_2 0 N_3 K 0.228 >R_R1 A N_3 5 >.ENDS MyWhiteLED >****************************************************************** > >Schematic and PSpice simulation results at... > >Newsgroups: alt.binaries.schematics.electronic > >Message-ID: <qo41l5llt9mtna5bepi6facrf03p4p7l7s(a)4ax.com> > > ...Jim Thompson If you have data points for other LED's... measure VF at many currents (*)... PULSED to avoid heating, send the data to me and I'll make a model for them. (*) Measure VF at IF = 0.1mA 0.2mA 0.5mA 1mA 2mA 5mA 10mA 20mA 50mA ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: Paul Hovnanian P.E. on 27 Jan 2010 21:28 I found my old HP-41C curve fit program card. Then I found my old HP-41C. The model I get from your curve is: ..MODEL MyWhiteLED D + IS = 4.4249E-9 + N = 8.3923 + RS = 7.7980 No subcircuits required. -- Paul Hovnanian mailto:Paul(a)Hovnanian.com ------------------------------------------------------------------ Ask not for whom the <CONTROL-G> tolls.
From: Jon Kirwan on 27 Jan 2010 22:38 On Wed, 27 Jan 2010 19:28:57 -0700, "Paul Hovnanian P.E." <Paul(a)Hovnanian.com> wrote: >I found my old HP-41C curve fit program card. Then I found my old >HP-41C. > >The model I get from your curve is: > >.MODEL MyWhiteLED D >+ IS = 4.4249E-9 >+ N = 8.3923 >+ RS = 7.7980 > >No subcircuits required. That N looks frightening. Jon
From: Paul Hovnanian P.E. on 27 Jan 2010 23:49
Jon Kirwan wrote: > > On Wed, 27 Jan 2010 19:28:57 -0700, "Paul Hovnanian P.E." > <Paul(a)Hovnanian.com> wrote: > > >I found my old HP-41C curve fit program card. Then I found my old > >HP-41C. > > > >The model I get from your curve is: > > > >.MODEL MyWhiteLED D > >+ IS = 4.4249E-9 > >+ N = 8.3923 > >+ RS = 7.7980 > > > >No subcircuits required. > > That N looks frightening. Yes, but it seems to work for the white LED (probably a blue LED) curve. I haven't gotten into the physics of the problem, but the emmission coefficient (N) seems to track the band gap of the junction involved. So this isn't as bizarre as it appears. -- Paul Hovnanian mailto:Paul(a)Hovnanian.com ------------------------------------------------------------------ "Yee-Ha!" is not an adequate foreign policy. |