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Re: course of HOWTO build models like (sanken) STR-A6100
ericsson.sunshine?wrote: ? ?"But the most significant one is that I had been aware of the waveform of FB comparator's ... ? ? The picture in page.15 shown that the Vsc should be a vertical straight line ..." I think you meant to write *horizontal* line. ? ?"...?but my simulation shows it's rippled ..." You did say that ANY opinion is appreciated, so here is mine.? This is based on knowing nothing about the device, the datasheet, or the SPICE model. I'm guessing the waveforms in that plot on page 15 are idealistic, not realistic. It is an internal voltage inside the IC, right?? Chances are it won't be steady, not a straight flat line.? I don't know what drives it, because the figure in the datasheet shows an empty box going to that node.? Is the voltage on the FB/OLP pin steady?? I guess it must be rippled too. Your uploaded file doesn't have the "TL431(TI)" (both symbol and model). Andy |
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Is direct contact okay?
analogspiceman Are you okay to help me out directly based on the simulations you have posted in the LTSpice Group? I would appreciate some help (for now at least) with simulating an actual Current Transformer (CT), starting from e.g. your "CurrentSense.asc" simulation. I do not really want to ask detailed questions relating to our R&D Application in a Public Forum. Thanks and Regards Henry Kafeman Sent from Yahoo Mail. |
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Re: Analog Devices to buy LT!
开云体育this works:
? ? ? From: LTspice@... [mailto:LTspice@...]
Sent: Thursday, July 28, 2016 9:17 AM To: [LTspice] group Subject: Re: [LTspice] Re: Analog Devices to buy LT! ? ? ? ?"They still need more microwave capability, per the LT people..." ? ADI did acquire Hittite Microwave, a couple of years back. ? That one was rather disappointing because they took down Hittite's website (for a while they didn't even re-direct it to !), and they didn't make it easy to find anything about Hittite's product line.? Maybe that's been fixed. ? Andy ? ?
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Re: course of HOWTO build models like (sanken) STR-A6100
Hi, :
I have done the (sanken) STR-A6100 sub-circuit for test, but this is the first time I do this thing (make spice model of some vendor by myself). I am not sure (not confident) that it's good. file is at: Can someone (familiar with this stuff (power IC, flyback)) provide some suggestions ? In fact, I have many questions that can't be answered ,almostly is the parameters like, charging current (Ix), and FB comparator's divider res, Ishunt gain, etc. But the most significant one is that I had been aware of the waveform of FB comparator's +,- (inverting & non-inverting) , these named "Vocpm" & "Vsc" in the datasheet at page.15. The picture in page.15 shown that the Vsc should be a vertical straight line, but my simulation shows it's rippled, though the output seems a little bit well. I just not sure whether it's right or not, I don't have the answer. Any opinion is appreciating. ? Best regards. |
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Re: Analog Devices to buy LT!
? ?"They still need more microwave capability, per the LT people..." ADI did acquire Hittite Microwave, a couple of years back. That one was rather disappointing because they took down Hittite's website (for a while they didn't even re-direct it to !), and they didn't make it easy to find anything about Hittite's product line.? Maybe that's been fixed. Andy ? |
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Re: Analog Devices to buy LT!
开云体育My concern is that Mike will choose not to stay. Since LTspice seems to be a one-man show, it could be quite vulnerable to “disenchantment”.Jim James Wagner Oregon Research Electronics
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Re: Analog Devices to buy LT!
IF this sale goes through....and IF this acquisition does not become the target of yet another takeover (the
Chinese have been buying lots of American companies...and British/UK companies as of late)...this might be ?good news around here..at least what has been mentioned so far. Click on John's link and see the chart on ?the top 10 chip makers. They still need more microwave capability, per the LT people...with something like the Skyworks positions and cell phone chip sets (and rf industry -- military items)...not the Intel wireless stuff. TI by the way has special patents on Ballistic Millimeterwave and Terahertz devices see: Time will tell, but at least we (and the LTSPICE community) are still on a decent gravy train...nothing like what happened to Microwave Office and ANSOFT. W. Warren ? ? |
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Re: Schottky Diode Models
Bordodynov Thank you for the file LeakShottky.zip That looks better and I think matches the BAR43SFILM "Typical" Specification. It has e.g. 28.13microA Reverse Leakage Current at 30V and 100C. But could you tell me how the values in the model should be changed to match the worst case stated values? - e.g. Maximum Reverse Leakage Current at 30V of 500nanoA at 25C and 100microA at 100C. The Datasheet for the BAR43SFILM is here: Thanks Henry ? Sent from Yahoo Mail. On Thursday, July 28, 2016 7:52 AM, "Александр Бордодынов BordodunovAlex@... [LTspice]" wrote:
?
Hello.
See file LeakShottky.zip in TEMP folder. Bordodynov. 27.07.2016, 19:53, "helmutsennewald@... [LTspice]" : > Hello Henry, > > The value for N is by far too high. It should be more realistic between 1 and 2. > Maybe they feed less useful measurement data into their curve fitter. > > .model dx??? D(IS=480.77E-6 N=4.9950 RS=40.150E-3 IKF=20.507 EG=.69 XTI=2 CJO=13.698E-12 > +??? ??? ??? M=.50005 VJ=.38464 ISR=10.010E-21 FC=0.5 NR=4.9950 TT=0) > > Best regards, > Helmut > > |
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Re: vc pot with internal resistance
Hello Jeff,
The potentiometer_vc from Files>Lib>Potentiometer>potentiomer_vc.asy use the circuit below. potentiometer_vc.sub * This is the potentiometer * ? ? ?? * ? ? ? ? ? ? 1? * ? ? ? ? ? ? | * ? ? ? ? ? ?| | * control 4 -| |- 3 wiper * ? ? ? ? ? ?| | * ? ? ? ? ? ? | * ? ? ? ? ? ? 2 * * Control input 0V to 1V, 0V means wiper near pin-2 .SUBCKT potentiometer_vc 1 2 3 4 R0 1 3 R={Rtot}*limit(1m,(1-V(4)),999m) R1 3 2 R={Rtot}*limit(1m,V(4),999m) .ENDS Best regards, Helmut |
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Re: Analog Devices to buy LT!
Let's hope part of the deal is not that dreaded word rationalization (unlikely it's not!) unfortunately bean counters have a habit of being technically incompetent and like many have said they were rivals and then there is management politics and self interest at work so don't be so sure the result will be positive for this community!
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Re: Analog Devices to buy LT!
? ?"With any luck they'll create LTspice models for their offerings." Adding a bit more to my previous reply.... LTC's strength is in power conversion products and switchers, which benefit greatly from the special features in LTspice.? ADI's greater strength is in linear parts and converters, for which standard SPICE models work well.? In other words, the special hidden features built into LTspice, might not do as much to improve the models for the vast majority of ADI's parts. This is supposed to be one of the reasons for ADI's interest in LTC -- the fact that LTC's product line doesn't overlap with ADI's. Andy |
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Re: Analog Devices to buy LT!
Weddig, Henning-Christof
hm, what about ADISIMPE? This is a version from Simetrix and also is using pspice models. Henning Weddig From: "LTspice" To: "LTspice" Sent: Wednesday, 27 July, 2016 22:33:24 Subject: Re: [LTspice] Re: Analog Devices to buy LT!
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That would be really great!!......now we wait do ti to aquire ltc and adi next to extend library more....that would be really great! On 27 Jul 2016 23:07, "helmutsennewald@... [LTspice]" <LTspice@...> wrote:
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Re: Analog Devices to buy LT!
? ?"ADI has its own in-house simulator, ADICE." For its customers, Analog Devices offers ADIsimPE, which is based on SIMetrix/SIMPLIS.? Those programs are from a separate company ().? It does have schematic entry.? The SIMPLIS part of it is intended to speed up simulations of ?switching regulators and PLLs. ? ?"They're not likely to ... discard a superb customer tool like LTspice." I agree.? I also hope they continue to support LTspice's continued development. ? ?"With any luck they'll create LTspice models for their offerings." Many ADI products have SPICE models already.? LTspice models are SPICE models.? But we have seen occasional models from them that do not play friendly, or were plain wrong (e.g., wrong polarity or something similar). Andy |
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Re: vc pot with internal resistance
John Woodgate
开云体育I'm uploading 'Pot calculations' for you. It's just a calculation sheet, so don't try to run it. ? With best wishes DESIGN IT IN! OOO – Own Opinions Only J M Woodgate and Associates Rayleigh England ? Sylvae in aeternum manent. ? From: LTspice@... [mailto:LTspice@...]
Sent: Thursday, July 28, 2016 8:09 AM To: LTspice@... Subject: [LTspice] vc pot with internal resistance ? ? I ran into the voltage controlled pots and found them very useful, but they all acted like variable voltage sources and I would like one that takes into account the internal resistance with a voltage controlled wiper. I'm not sure how difficult the math will be, but here's how I see it; using a 10K pot, 10 volts applied, and the wiper at 50% and connected to a 5K load, the equivalent circuit would be a 5K resistor in series with a 2.5K resistor,1/2 of the 10K pot in parallel with the 5K load and have a voltage of 3.33 volts on it.. It's been a long time since I took calculus and algebra, so I have no idea what the math would be to show the voltage on the wiper as it moved from 0 to 100%.? Thanks, Jeff? PS can you show the math? Please? |
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Re: vc pot with internal resistance
开云体育Do you want the formula - which is nothing but the standard
voltage divider formula - or do you want to simulate it in spice? Le 28/07/2016 à 09:08,
kinarfi@... [LTspice] a écrit?:
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Re: Pending acquisition of LTC by ADI
John Woodgate
开云体育I have set this address peeryanastasiaxj@... to 'can't post' and 'can't upload' as the post below is an example of a troll trying to break into the list. If the address has been hi-jacked, the situation can be fixed. ? With best wishes DESIGN IT IN! OOO – Own Opinions Only J M Woodgate and Associates Rayleigh England ? Sylvae in aeternum manent. ? From: LTspice@... [mailto:LTspice@...]
Sent: Thursday, July 28, 2016 5:14 AM To: LTspice@... Subject: Re: [LTspice] Pending acquisition of LTC by ADI ? ? Perfect ? ? ? Sent from Yahoo Mail. ? ? |
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vc pot with internal resistance
I ran into the voltage controlled pots and found them very useful, but they all acted like variable voltage sources and I would like one that takes into account the internal resistance with a voltage controlled wiper. I'm not sure how difficult the math will be, but here's how I see it; using a 10K pot, 10 volts applied, and the wiper at 50% and connected to a 5K load, the equivalent circuit would be a 5K resistor in series with a 2.5K resistor,1/2 of the 10K pot in parallel with the 5K load and have a voltage of 3.33 volts on it.. It's been a long time since I took calculus and algebra, so I have no idea what the math would be to show the voltage on the wiper as it moved from 0 to 100%.? Thanks, Jeff? PS can you show the math? Please? |
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Re: Schottky Diode Models
Hello.
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See file LeakShottky.zip in TEMP folder. Bordodynov. 27.07.2016, 19:53, "helmutsennewald@... [LTspice]" <ltspice@...>: Hello Henry, |