.MODEL 15ljq100 D(IS=6.15446e-05 RS=0.0153982 N=1.88088 EG=1.3 ... I don't know much about the details ... but EG=1.3 might be a bit high for a Schottky diode. The LTspice help docs imply a value of 0.69 would be more typical for a Schottky. But I would be very reluctant to change any of the parameters and have something depend on the results. You could try searching the Internet for "SPICE diode model" and see what pops out. For example, this document looks interesting: Also there is the PSPICE reference manual, easily found by searching the net for "PSPCREF.pdf". Andy
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--- In LTspice@..., George <jasoto32@...> wrote:
Helmut, are there formulas or equations to change those parameters?
Sent from my iPad
Hello, You could change the parameter Eg and then rerun a temperature simulation while watching the forward voltage. You should get something like -1.5mV/¡ãC to -2mV/¡ãC. Best regards, Helmut
On 04/10/2013, at 1:02 a.m., "Helmut" <helmutsennewald@...> wrote:
--- In LTspice@..., "j_asoto" <jasoto32@> wrote:
I have to simulate a complex circuit that have zeners, magnetics, MOSFET, resistors, capacitors and different diodes. the simulation shall be performed at three different temperatures (+25C, -34C, +71C). I already have all the components model at each temperatures, but there is a model of a SCHOTTKY DIODE, that is only at +25C, which is the following:
.MODEL 15ljq100 D(IS=6.15446e-05 RS=0.0153982 N=1.88088 EG=1.3 XTI=3.60437 BV=100 IBV=0.0001 CJO=1.08848e-09 VJ=0.4 M=0.371667 FC=0.5 TT=1e-09 KF=0 AF=1)
These are the questions: In order to have the model behavior on other temperatures (-34C and +71C), which parameters from the model above I have to change? How the parameter are change?(there is a tutorial or formulas that take the temperature as a function of the parameters)?
Thanks
Hello,
The change of the forward voltage versus temperature can be set
with the parameter Eg. This allows you to adjust the -x.xmV/?¡ãC.
What also depend on temperature is leakage current in reverse
operation and series resistance Rs in forward operation.
Best regards,
Helmut
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--- In LTspice@..., ¨¢???????? ?????????¡Á <BordodunovAlex@...> wrote:
Hi.
I changed the models transistors AC127, AC128. Now the model is more correct. See the new Standard.zip file.
Bordodynov.
Excellent - this may need to be experimented with, but you're right Is is different for germaniums. I had to use 2.7e-5 to make a realistic OC35, as according to the behaviour of actual real ones.
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Re: Solar cell in Lt spice
--- In LTspice@..., "heitham_hh" <krouz_83@...> wrote:
--- In LTspice@..., "Helmut" <helmutsennewald@> wrote:
--- In LTspice@..., "heitham_hh" <krouz_83@> wrote:
hi,
how can i make a spice model for this cell?
Hello Heitham,
I have uploaded an example with your solar cell.
Files > Temp > solar_cell_4V_35mA.asc
Best regards,
Helmut
thank you Helmut for the answer,just two more question : why in I=V(VLUX)*50u you have 50u? and how did you know R2=5?
Best regards,
Heitham
Hello Heitham, I=V(VLUX)*50u you have 50u? and how did you know R2=5? It's just a wild guess. Your datasheet contains too less information. You may have to do a measurement on the next sunny day to get better data. One cannot make a precise model from nearly zero information. Maybe you should better use 45uA and 4 Ohm. Best regards, Helmut
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If it means make a subckt in a library file, this needs an ASCII text editor - I copy the net list text (menu: View > SPICE Netlist)
Paste into text editor, at the top put '.subckt [name] [nodes]'
[name] is name of your 'device', whatever; [nodes] is the node numbers or node labels of all the circuit's external connections.
At the bottom change '.backanno / .end' to '.ends'
It also needs models of any specific components (diodes, transistors etc.) as .model lines.
Text file can then be saved as, .sub .txt .lib as you prefer.
Next you need to create a symbol for it, using LTspice symbol editor. The numbering order of the symbol ports must be the same as in the subckt nodes list; '1' is first and '5' is last for .subckt name 1 2 3 4 5; or 'in+' is first and 'vout' is last for .subckt name in+ in- v+ v- vout
If as I did you look at examples it clicks into place how it all works.
HTH
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Re: The reordering of node numbers makes me crazy - is there a workaround?
To be honest I don't know the answer, but I might make a wild guess that A. it is more efficient, or safer, or something, that when a schematic is edited, to renumber unlabelled nodes as the simplest way to make sure they are all unique; B. the part that does the sim and plots is separate from the schematic editor so that it cannot possibly know beforehand, or be told even, that a node has been 'moved' to a different part of the schematic. I might also hazard a guess that it wasn't originally envisaged that anybody would edit and sim, edit and sim, edit and sim, with the plots window still open all the while, although that's what we do. I.e. by the time of the sim stage the schematic is assumed to be finished? Perhaps we're supposed to always close the plots window before changing it? Although we don't. :D
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Re: Solar cell in Lt spice
--- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:
--- In LTspice@..., "heitham_hh" <krouz_83@> wrote:
hi,
how can i make a spice model for this cell?
Hello Heitham,
I have uploaded an example with your solar cell.
Files > Temp > solar_cell_4V_35mA.asc
Best regards,
Helmut
thank you Helmut for the answer,just two more question : why in I=V(VLUX)*50u you have 50u? and how did you know R2=5? Best regards, Heitham
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Ops, that didn't turn out that crisp. If you click reply you'll probably see the editing text and then what I tried to post.
toggle quoted message
Show quoted text
--- In LTspice@..., "per_normann@..." <per_normann@...> wrote:
There is an other symbol. It's basically the same but with a European resistor symbol instead of the Usa symbol. How would I go about changing the looks of a LTspice-component?
The symbol I look for looks something like this.
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--- In LTspice@..., "Helmut" <helmutsennewald@> wrote:
--- In LTspice@..., "per_normann@" <per_normann@> wrote:
I have a circuit that I like to present in a European
style. Most of the needed components seems to be default,
but I can't find potentiometers. Are there any European
potentiometers to be found somewhere?
Cheers!
Hello,
I only know the potentiometer symbols from our Files section.
Files > Lib > Potentiometer.
You could simply modify one of these symbol.
Best regards,
Helmut
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There is an other symbol. It's basically the same but with a European resistor symbol instead of the Usa symbol. How would I go about changing the looks of a LTspice-component?
The symbol I look for looks something like this.
|
_|_
| |
| |<---
|_|
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toggle quoted message
Show quoted text
--- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:
--- In LTspice@..., "per_normann@" <per_normann@> wrote:
I have a circuit that I like to present in a European
style. Most of the needed components seems to be default,
but I can't find potentiometers. Are there any European
potentiometers to be found somewhere?
Cheers!
Hello,
I only know the potentiometer symbols from our Files section.
Files > Lib > Potentiometer.
You could simply modify one of these symbol.
Best regards,
Helmut
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Helmut, are there formulas or equations to change those parameters? On 04/10/2013, at 1:02 a.m., "Helmut" <helmutsennewald@...> wrote:
--- In LTspice@..., "j_asoto" <jasoto32@...> wrote:
I have to simulate a complex circuit that have zeners, magnetics, MOSFET, resistors, capacitors and different diodes. the simulation shall be performed at three different temperatures (+25C, -34C, +71C). I already have all the components model at each temperatures, but there is a model of a SCHOTTKY DIODE, that is only at +25C, which is the following:
.MODEL 15ljq100 D(IS=6.15446e-05 RS=0.0153982 N=1.88088 EG=1.3 XTI=3.60437 BV=100 IBV=0.0001 CJO=1.08848e-09 VJ=0.4 M=0.371667 FC=0.5 TT=1e-09 KF=0 AF=1)
These are the questions: In order to have the model behavior on other temperatures (-34C and +71C), which parameters from the model above I have to change? How the parameter are change?(there is a tutorial or formulas that take the temperature as a function of the parameters)?
Thanks
Hello,
The change of the forward voltage versus temperature can be set
with the parameter Eg. This allows you to adjust the -x.xmV/¡ãC.
What also depend on temperature is leakage current in reverse
operation and series resistance Rs in forward operation.
Best regards,
Helmut
[Non-text portions of this message have been removed]
|
--- In LTspice@..., "per_normann@..." <per_normann@...> wrote:
I have a circuit that I like to present in a European
style. Most of the needed components seems to be default,
but I can't find potentiometers. Are there any European
potentiometers to be found somewhere?
Cheers!
Hello, I only know the potentiometer symbols from our Files section. Files > Lib > Potentiometer. You could simply modify one of these symbol. Best regards, Helmut
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Hi.
I changed the models transistors AC127, AC128. Now the model is more correct. See the new Standard.zip file.
Bordodynov.
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Re: The reordering of node numbers makes me crazy - is there a workaround?
Howie, Brian (Selex ES, UK)
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Show quoted text
-----Original Message-----
From: LTspice@... [mailto:LTspice@...] On Behalf Of Panama Mike
Sent: 09 April 2013 16:24
To: LTspice@...
Subject: Re: [LTspice] Re: The reordering of node numbers makes me crazy - is there a workaround?
It is not random whatsoever.? It just reflects that some people
haven't really thought about how a schematic represents a circuit
-- how nodes actually are depicted and how those lines are not
wires but a graphical notation that both ends are the same node.
?
Anyone who complains about node-renumbering, should be forced to type in their schematics as net-lists for a few months.
Brian
--
Brian Howie
Systems Engineering
Selex ES, A Finmeccanica Company
2 Crewe Road North
Edinburgh
EH5 2XS
(Phone) +44 (0) 131 343 4653
(Email) brian.howie@...
www.selex-es.com
Don't send me HTML, it may be deleted unread
Selex ES Ltd
Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL
A company registered in England & Wales. Company no. 02426132
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This email and any attachments are confidential to the intended
recipient and may also be privileged. If you are not the intended
recipient please delete it from your system and notify the sender.
You should not copy it or use it for any purpose nor disclose or
distribute its contents to any other person.
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I have a circuit that I like to present in a European style. Most of the needed components seems to be default, but I can't find potentiometers. Are there any European potentiometers to be found somewhere?
Cheers!
|
Hi John Woodgate.
Thanks for the info. In my Standard.zip file is 2N242 and germanium transistors 2N2955. Using these models and your information I will make models of transistors AC128 AC127 more believable.
Bordodynov.
10.04.2013, 10:19, "John Woodgate" <jmw@...>:
toggle quoted message
Show quoted text
In message <367291365570925@...>, dated Wed, 10 Apr 2013,
=?koi8-r?B?4czFy9PBzsTSIOLP0sTPxNnOz9c=?= <BordodunovAlex@...>
writes:
If you have the details of these transistors, then ask them to send to
me. I have some data:
AC127: NPN, Ptot max 340 mW, fT typ 2.5 MHz, Vcbo max 32 V, Vceo max 12,
Vebo max 10 V, Ic (max) 500 mA, hFE 50 min @ 500 mA (typ), Tj max 90 C,
Cob max 140 pF.
AC128: PNP, Ptot max 700 mW, fT typ 1 MHz, Vcbo max -32 V, Vceo max -16,
Vebo max -10 V, Ic (max) 1000 mA, hFE 80 min @ 1000 mA (typ), Tj max
100?C, Cob max 200 pF.
Complementary only by a stretch of the imagination!
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
They took me to a specialist burns unit - and made me learn 'To a haggis'.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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In message <367291365570925@...>, dated Wed, 10 Apr 2013, =?koi8-r?B?4czFy9PBzsTSIOLP0sTPxNnOz9c=?= <BordodunovAlex@...> writes: If you have the details of these transistors, then ask them to send to
me. I have some data: AC127: NPN, Ptot max 340 mW, fT typ 2.5 MHz, Vcbo max 32 V, Vceo max 12, Vebo max 10 V, Ic (max) 500 mA, hFE 50 min @ 500 mA (typ), Tj max 90 C, Cob max 140 pF. AC128: PNP, Ptot max 700 mW, fT typ 1 MHz, Vcbo max -32 V, Vceo max -16, Vebo max -10 V, Ic (max) 1000 mA, hFE 80 min @ 1000 mA (typ), Tj max 100?C, Cob max 200 pF. Complementary only by a stretch of the imagination! -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk They took me to a specialist burns unit - and made me learn 'To a haggis'. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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Hi. Note that these models are not correct. Option model "IS=1.41f" is too small. Which produces a voltage drop on the emitter-base transition typical of silicon transistors. Unfortunately I have no data on the actual amount. Then you can easily calculate the "IS". I appeal to all. If you have the details of these transistors, then ask them to send to me. Then I can make the correct model. Bordodynov. 10.04.2013, 08:10, "aetuhf" <atupker@...>:
Can someone fix the labeling of the AC127 file?
Files > Examples > Apps > Electric Guitar Fuzz Effect > Distortion Preamp
ac127.mod: AC127 PNP Germanium Transistor Model Subcircuit File
ac128.mod: AC128 PNP Germanium Transistor Model Subcircuit File
The two files are both listed as PNP transistors as shown above. The AC127 is actually an NPN transistor. The text inside the model file is correct, just the labeling of the file is wrong.
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--- In LTspice@..., "j_asoto" <jasoto32@...> wrote:
I have to simulate a complex circuit that have zeners, magnetics, MOSFET, resistors, capacitors and different diodes. the simulation shall be performed at three different temperatures (+25C, -34C, +71C). I already have all the components model at each temperatures, but there is a model of a SCHOTTKY DIODE, that is only at +25C, which is the following:
.MODEL 15ljq100 D(IS=6.15446e-05 RS=0.0153982 N=1.88088 EG=1.3 XTI=3.60437 BV=100 IBV=0.0001 CJO=1.08848e-09 VJ=0.4 M=0.371667 FC=0.5 TT=1e-09 KF=0 AF=1)
These are the questions: In order to have the model behavior on other temperatures (-34C and +71C), which parameters from the model above I have to change? How the parameter are change?(there is a tutorial or formulas that take the temperature as a function of the parameters)?
Thanks
Hello, The change of the forward voltage versus temperature can be set with the parameter Eg. This allows you to adjust the -x.xmV/¡ãC. What also depend on temperature is leakage current in reverse operation and series resistance Rs in forward operation. Best regards, Helmut
|
Can someone fix the labeling of the AC127 file?
Files > Examples > Apps > Electric Guitar Fuzz Effect > Distortion Preamp
ac127.mod: AC127 PNP Germanium Transistor Model Subcircuit File
ac128.mod: AC128 PNP Germanium Transistor Model Subcircuit File
The two files are both listed as PNP transistors as shown above. The AC127 is actually an NPN transistor. The text inside the model file is correct, just the labeling of the file is wrong.
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... Could happen that a worst case escenario of a test, shall have passive
components in high temperature but active components at low temperature.
What advice could any one give me for this case? LTspice lets you assign different temperatures to each component. See the optional "temp=<value>" qualifier, which can be added to any component that has a temperature dependency. It acts as an override to the global temperature set by the .TEMP statement. Andy
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aurvii