Solar panel example for LT-Spice?

Started by Peabody in sci.electronics.design6 months ago 7 replies

I'm working on a TP4056-based 1S LIPO solar charger which includes a load sharing (aka power path) function. But I don't have a panel to test...

I'm working on a TP4056-based 1S LIPO solar charger which includes a load sharing (aka power path) function. But I don't have a panel to test with. So I'd like to simulate the circuit in LT-Spice. But I've never used spice, LT or otherwise, so I was hoping to find an example of a solar panel equivalent circuit that I could import, then add the rest of the circuit, which is pretty simpl...


XY plots in LT Spice

Started by John Larkin in sci.electronics.design2 years ago 2 replies

I can manually change the x-axis of a transient response graph, from time to some node voltage, by manually right-clicking on the...

I can manually change the x-axis of a transient response graph, from time to some node voltage, by manually right-clicking on the graph x-axis. But that doesn't stick. Is there some spice directive I can put on my schematic to change the plot x-axis? I want to plot diode currents from -0.5 to +0.5 volts. LT Spice is wonderful and its HELP is awful. -- John Larkin H...


SPICE simulation -- how to bias a crystal oscillatoir

Started by Anonymous in sci.electronics.design6 years ago 26 replies

Could some electronics/SPICE guru please help ? I have a simple model of a quartz crystal, as used in an oscillator. With my SPICE simulation, I...

Could some electronics/SPICE guru please help ? I have a simple model of a quartz crystal, as used in an oscillator. With my SPICE simulation, I can measure both the parallel and series resonant frequencies of the "pure" crystal. However, when I attach the same crystal to a biasing circuit, and run the simulation, the output is a flat DC offset. The biasing circuit involves two CMOS(1.0u m...


half-sine

Started by John Larkin in sci.electronics.design6 years ago 16 replies

I need to Spice a pretty good Gaussian pulse. So I'm thinking square pulse and a biggish, like 6 pole, Bessel lowpass filter. But wait, will...

I need to Spice a pretty good Gaussian pulse. So I'm thinking square pulse and a biggish, like 6 pole, Bessel lowpass filter. But wait, will Spice make somethig better as the starting point? Duh, it will generate a half-sine. https://dl.dropboxusercontent.com/u/53724080/Circuits/Spice/Half_Sine.jpg That should be a lot easier to filter than a pulse. Any other ideas for making a nic...


LT Spice annoyance

Started by John Larkin in sci.electronics.design4 years ago 11 replies

I like to have my schematic on the bottom of the screen and waveforms above. Once in a while, LT Spice elects to swap them. I can't tell...

I like to have my schematic on the bottom of the screen and waveforms above. Once in a while, LT Spice elects to swap them. I can't tell why it does this, or how to make it stop. Any ideas? -- John Larkin Highland Technology, Inc lunatic fringe electronics


AN: New Spice Model Posted to my Website

Started by Jim Thompson in sci.electronics.design6 years ago 1 reply

New Spice Model Posted to my Website: Every Spice Simulator has their own proprietary way of implementing digital functions... LTspice Digital...

New Spice Model Posted to my Website: Every Spice Simulator has their own proprietary way of implementing digital functions... LTspice Digital Primitives don't play on PSpice, PSpice Digital Primitives don't play on LTspice... neither play anywhere else. Thus I have rolled my own Spice Model for the venerable HC4538 one-shot that uses universal behavioral modeling for the digital elemen...


LM386 & Spice

Started by Anonymous in sci.electronics.design5 years ago 38 replies

I need to sim an LM386 amp to see what decoupling caps are neded for stability on end of life batteries. Is there a Spice model for this anywhere?...

I need to sim an LM386 amp to see what decoupling caps are neded for stability on end of life batteries. Is there a Spice model for this anywhere? My LTSpice seems to lack any of the IC models I'm likely to use. NT


Analog division, current conveyors and SPICE

Started by Anonymous in sci.electronics.design7 years ago 4 replies

Could some analog/SPICE guru please help ? I am running SPICE simulations on current conveyors, focusing analog computation. Specifically, I...

Could some analog/SPICE guru please help ? I am running SPICE simulations on current conveyors, focusing analog computation. Specifically, I am examining in detail analog division. I am referring to Sedra and Smith's 1970 paper. Given that a negative impedance converter shifts the phase of the input signal by 180 degrees, what would be the effect of analog division of one signal by ...


LT Spice diode model

Started by John Larkin in sci.electronics.design9 years ago 1 reply

Hi, I'm adding a diode model, SMS7621-079, to the LT Spice standard.dio file. My diode data sheet shows Spice parameter Cjo = 0.1 pF, but...

Hi, I'm adding a diode model, SMS7621-079, to the LT Spice standard.dio file. My diode data sheet shows Spice parameter Cjo = 0.1 pF, but the parts have a typical capacitance of 0.22 pF. I assume the extra capacitance is the package, which wouldn't behave like Cjo. I don't see an obvious place, in the model script, for the package c. There are some "sidewall" params, but I don't kno...


SPICE model for HEMT ?

Started by Anonymous in sci.electronics.design5 years ago 6 replies

I am faced with an odd problem. The HEMT lumped element model in the paper: A Simple and Accurate Circuit Simulation Model for GaN Power...

I am faced with an odd problem. The HEMT lumped element model in the paper: A Simple and Accurate Circuit Simulation Model for GaN Power HEMTs is very compact and intuitive, but the authors provide no circuit parameter values for SPICE simulation. The SPICE GaN model provided by GaN Systems at their Web site is too complicated/non-intuitive and throws lots of error messages with HSpice ...


Are TI Pspice models encripted?

Started by Anonymous in sci.electronics.design6 years ago 67 replies

I was going to try to load the TI TPS54335 spice model into LTspice but it looks encrypted. Is TI encrypting its spice models...

I was going to try to load the TI TPS54335 spice model into LTspice but it looks encrypted. Is TI encrypting its spice models now? http://www.ti.com/product/tps54335 Thanks


Looking for SPICE model for MJE13005

Started by Anonymous in sci.electronics.design5 years ago 2 replies

Could someone please point me to a SPICE model for the NPN transistor MJE13005. I have ploughed through the online OnSemi Web site, but not...

Could someone please point me to a SPICE model for the NPN transistor MJE13005. I have ploughed through the online OnSemi Web site, but not much luck. Thanks in advance for your help.


New LT Spice

Started by John Larkin in sci.electronics.design4 years ago 18 replies

The new LT Spice XVII seems to work and seems fast, but I can't get grid lines to appear on waveform plots. Any suggestions? The old...

The new LT Spice XVII seems to work and seems fast, but I can't get grid lines to appear on waveform plots. Any suggestions? The old (version IV) and new versions are both on my desktop now for some reason. -- John Larkin Highland Technology, Inc trk jlarkin att highlandtechnology dott com http://www.highlandtechnology.com


LT Spice flaws?

Started by Terry Pinnell in sci.electronics.design1 year ago 29 replies

I've recently started using LT Spice. A great free tool, with the overriding advantage of widespread use. (Unlike CircuitMaker 2000 Pro, of...

I've recently started using LT Spice. A great free tool, with the overriding advantage of widespread use. (Unlike CircuitMaker 2000 Pro, of which I seem to be the only current user on the planet.) But LT's UI is not so good. Have there been any hacked versions that attempt improvements? For example, using the more modern rectangular resistors rather than zigzags? And I was surprised to find...


transformer K in LT Spice

Started by Anonymous in sci.electronics.design2 years ago 6 replies

I recall seeing, somewhere, that LT Spice may handle a transformer with K=1 different from one where K

I recall seeing, somewhere, that LT Spice may handle a transformer with K=1 different from one where K


NE3509 SPICE model?

Started by Joerg in sci.electronics.design10 years ago 19 replies

Gents, Does anyone know where to find the SPICE model for the NE3509? Or at least one that's close enough for pulse stuff? CEL only has the...

Gents, Does anyone know where to find the SPICE model for the NE3509? Or at least one that's close enough for pulse stuff? CEL only has the usual microwave models but I want to use it as a fast low capacitance switch and simulate in LTSpice. -- Regards, Joerg http://www.analogconsultants.com/


Spice problems

Started by Robert Baer in sci.electronics.design7 years ago 5 replies

Firstly, only the latest LTSpice IV is available,and sources insist only WinXP "or better" will run it. So tried to get old SwitcherCAD...

Firstly, only the latest LTSpice IV is available,and sources insist only WinXP "or better" will run it. So tried to get old SwitcherCAD III; unobtanium. Said, WTF, loaded the LTSpice IV exe, ran it; looks OK - no errors anyway. BUT I have this National Semiconductor Spice file and it barfs on it "Unknown schematic syntax .SUBCKT LM185/27C 99 2" and do not knowhow to fix th...


Bad OpAmp Spice Models?

Started by Jim Thompson in sci.electronics.design8 years ago 6 replies

I'm trying to make a list of OpAmp Spice models that either poorly model power supply currents, or not at all. Suggestions, hopefully with...

I'm trying to make a list of OpAmp Spice models that either poorly model power supply currents, or not at all. Suggestions, hopefully with details of how they deviate from the real device, would be appreciated. Thanks! ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations ...


risetime in LT Spice

Started by John Larkin in sci.electronics.design7 years ago 31 replies

Got a suggestion for making 10/90 risetime measurements in LT Spice? I need to do that a lot, as I tweak other things. I can do it manually...

Got a suggestion for making 10/90 risetime measurements in LT Spice? I need to do that a lot, as I tweak other things. I can do it manually on the waveform plot, but that's a nuisance. I have two waveforms of interest, one electrical, the other a simulated optical waveform. I could fake some sort of window comparators, which would at least be a little easier to measure on the plot. Or...


SPICE gets it wrong

Started by Tim Williams in sci.electronics.design5 years ago 74 replies

Speaking of SPICE, here's a nice little circuit: https://www.seventransistorlabs.com/Images/BakerDarlington.png I discovered the oscillator on...

Speaking of SPICE, here's a nice little circuit: https://www.seventransistorlabs.com/Images/BakerDarlington.png I discovered the oscillator on the left, when attempting to build a Darlington transistor pair with a Baker clamp. (In practice, R10 comes from a logic voltage input, and R2 is a load, often inductive. R14 is optional, but exacerbates the oscillation, making it reproducible.)...