LM1085 Voltage regulator in Multisim

Hi!
Is it possible to add model for LM1085 Voltage regulator in Multisim? I don't have it in MultiSim PowerPro 13.0

Hi,
You should check the manufacturer website to see if they have a SPICE model available for download. If they do, you can follow component creation tutorial to create a new part.
http://www.ni.com/tutorial/3173/en/
Tien P.
National Instruments

Similar Messages

Modeling voltage regulator loss in Multisim

Hi.. I'm trying to model voltage regulator efficiency loss in Multisim.. I have a system with cascaded switching regulators and loads.
I have VR efficiency curves for all the regulators.. (ie spreadsheet of efficiency at different loads measured from lab data)
I'm trying to get overall system power using static loads.. I originally thought I could use ABM current sources inside of a sub circuit, using if statements (if output current >1 A, add 10% to input, if output current >2A, add 8% to input, etc.. but it looks like there is a problem with using ABM sources inside a sub circuit (according to some other threads)... I really need to be able to easily copy the regulators and make changes to the efficiency curves so just putting all of this in the main circuit seems prone to errors.
Does anyone have a good idea for how to do this? I've been using excel in the past but the spreadsheet has gotten really complicated.
Thanks
Mike

Hi Mike,
You are right, ABM sources and other SPICE mechanisms which rely on absolute node names don't work well in Subcircuits or Hierarchical Blocks. However, you can create a stepwise load response by using cascading a bunch of switches and current sources. Attached are two files. vreg.ms10 is a 12V source that has 10% efficiency at 1A and 18% efficiency at 2A. testbench.ms10 is a file which demonstrates the performance characteristics of the voltage regulator. Open the testbench and click Simulate>>Analysis>>Transient Analysis. The Multisim grapher will open and plot the input current and the load current and you should see the desired efficiency degradation. If you want to model more complex behaviour, you can add other nonlinear sources and components to the Hierarchical Block model the behaviour of your regulator.
There's no limit to what you can model with a bit of creativity in Multisim. Hope that helps.
Yi
Software Developer
National Instruments - Electronics Workbench Group
Attachments:
vreg.ms10 ‏50 KB
testbench.ms10 ‏38 KB

Help : power supply- voltage regulator

Thank you for all those that have replied me towards this power supply. In particular Lacy and Kittmaster.
I have developed a basic voltage regulator . However, I want to get a power supply that can deliver like 60V, and take about 10A current, because that what the load will require.
The regulator I have developed only delivers about 20V, I use the formula Vo = (R2/R3 + 1) * Vref. where my Vref is now 10V ( 2 zener diode). Even when I tried to decrease the resistance of R3, it does not make a difference.
Any help will be appreciated.
Attachments:
Power Supply Voltage Regulator.ms9 ‏1107 KB

O.K. I believe I have got it. There was a 2 fold problem with your regualtor and I will outline them below.
1) For some reason I could not get the 3-terminal Virtual Op Amps to work in this circuit. I traded that out for the 5 Terminal one. It is the very last one in the list of the Virtual category.
2) You are comparing your voltage from the bridge to your output voltage. If you have your input referenced to 10V and your output dviding this by a factor of 2 then once the voltage at the divider junction reaches 10V then the op amp will stop driving the transistor. Therefore you are only going to get 20V Out (ref*2 since both resitors are equal in value)). Therefore, you have to have your input reference to what you want the output to be. In this case 60V is what you want so you have 30V at the divider junction (Vo/2 since both resitors are equal value) your input reference would have to be 30V. I have never heard of a 30V Zener (they may exist, but it seems to me tha they would have to be quite large). so you may have to use a voltage divider on the input side instead.
It is my opinion that the design of this regulator is not going to work for you in reality if you decide to build it. The 2N2904 I I know is not going to handle 10A in reality. Based upon my findings I don't even know if you are going to be able to use an op-amp as the error amp due to the amount of voltage that has to be tied into it.You may be able to find such an op-amp but you will have to do some research to find one. I think most of the op amps in Multisim are low voltage in the range of 5VDC-22VDC. I would suggest looking on the internet and see if I could find a better alternative that uses more robust components or if you definitely want to design this on your own, reasearching the components in Multisim to see if any of them can handle the voltage and current requirements.
I hope this helps and I haven't confused you in any way
Message Edited by lacy on 10-06-2007 02:24 PM
Kittmaster's Component Database
http://ni.kittmaster.com
Have a Nice Day

Voltage Regulator problem !

Respect to All Experts !
Last month I had blown up my MSI 790FX GD70 by increasing "CPU VDD Voltage" to 1.45volts
I found this review http://www.legitreviews.com/article/1004/6/ relating to my problem bcoz they killed GD70 too by overvoltaging vCore.
According to them some first launched GD70s had buggy MOSFET/Voltage Regulator (9A2S292) which were not able to live at 1.45v. Unfortunately I bought one of them. My dead mobo had same MOSFET (9A2S292).
And then they successfully overclocked another new GD70 with new MOSFET (xxxx298) http://www.legitreviews.com/article/1103/1/
I got my dead mobo RMAed now
I have new mobo, new MOSFET
But this one has a different MOSFET (xxxx294)
I only wanna know if this one is strong enough to take voltage upto 1.45v or more ? Because I've read in many people are ok with 1.45v with this board.
I am stuck at 4.1GHz at 1.435v and I am also very afraid of increasing voltage more than this.
My Computer:
MSI 790FX GD70 (Latest BIOS)
Phenom II x6 1055T 2.8GHz, 125watt TDP
2x2GB ddr3 1333mhz
2xSeagate 500 in RAID0
Corsair TX850 V2 PSU
XFX HD 5770

Quote
What will happen if I increase voltage to 1.45v in "CPU Voltage" and leave "CPU VDD Voltage (MOSFET)" at default ?
Doubtful anyone can predict the outcome. I suppose it's always possible to ask MSI if they will modify your mainboard or exchange it for one with the xxxx298 & what the cost would be?

Leaky capacitors,voltage regulator shot on board

Hi
I posted my problem
Hi there
If you have any experience on my problem please share it with me.
When I push the power button, there is current flow, some hard disk activity
and sometimes cd-rom activity. But at this point nothing else happens. My
screen remains black and windows does not start (i figured that out because
there is no hard disk activity). After some reboots (sometimes 7) my system
starts and I see the lilo screen.
What might that be?
Thank you in advance
vga: ati 7200 vivo
in the forum list and I got this response
{leaky capacitors,voltage regulator shot on board}
The hardware store were I bought my m/b from has closed. Is there any
guarantee available?
My m/b is the K7T266 Pro and it is 1-1,5 year old
My country is Greece, Athens

Hi,
Contact MSI directly, they will help you.....

MSI P6N SLI Platinum Voltage regulator cooler size question

I have a question about MSI P6N SLI Platinum's Voltage regulator cooler. Is it the same size of K9N SLI Platinum? The reason I ask is I plan to use water cooling on it. But the only regulator waterblock I can find is desgined for K9N SLI Platinum from aqua computer http://www.aqua-pcs.co.uk/index.asp?function=DISPLAYPRODUCT&productid=218. So can I use this one on P6N SLI?

I guess not... P6N is much thinner, if your K9N VR cooler is as thin, then it can fit in. But I guess not.

K7N2-L & BSOD, D3D crashes, 2Dartifacts, poor cpu voltage regulation.

Problems: :O
2d tolerable but instable. Sysmon shows page faults, rising rapidly when programs are opened. DxDiag - crashes during d3d test most of the time. Quake3 gets to 2 seconds into the ID title before hanging.
Occasional 2D artifacts, system tray goes black and some colours reurn when you run the mouse over them.
Occasional series of small green vertical lines in the top portion of the screen on some crashes. IE works for a while and then crashes (windows closes it).
Setup:
Athlon TBird 1.4 (266fsb)
Enermax 350W PSU (185w 5.5v + 3.3v)
IBM 180GXP
IBM 75 GXP
Hitachi 8X DVD
1x case fan
1x cpu fan
LAN enabled (*functioning)
AC '97 (cannot get to work - I'll do this when the board is stable)
Geforce 2 GTS (4xagp - 8x disabled in bios)
Floppy drive
Generic PC2700 ddr (tested fine)
Win '98 frsh install
Latest BIOS + Drivers
All components except the mobo previously worked fine in on an ecs k7s5a with a LAN & soundcard.
Diagnostics:
sysmon errors (page fault - more or less continuos)
sisoft memory benchmark succsessful
sisoft cpu benchmark succsessful
sisoft multimedia benchmark succsessful
CPU voltage regualtion is RAGGED but within tolerances - 1.72-1.82v
3.3v +/- .1v
5.0v and 12V feeds are fine.
CPU temp reads 58-59 C
Lowering FSB on processor and RAM lowers stability -default clock fine.
Raising AGP voltage by +.1 aids stability.
Lowering Graphics card
core speed and memory speed helps a little.
Disabling fast-write helps a little.
Graphics card seating checked
All cables checked
Checked with another PSU
No obvious shorting.
Empirical:
Poor CPU voltage regulation - duff board
Poor AGP GART drivers
Poor Nvidia drivers
Please dont say change my PSU - its within its tolerance.
Thanks in advance.

Ive got a 4 sats + sub creative stuff and a mic.
The mic is in the mic, and ive got a lead in mic in and one in mic out.
I downloaded the new drivers and the sound is gr8!
http://www.realtek.com.tw
I still have problems loading windows and am getting repeated CONFIGMG windows protection error. I'm not too fussed about that because once its up and running, it runs like a dream.
Q.Any ideas as to why my 3dfx is so comparitively slow? (Yes I know I should go out and get a Radeon 9700 pro gti turbo ultra gold.........)
A. That'll be the z-buffer disabled...
I found some more info that might relate to my configmg problems here:
http://www.easttexaschat.com/_tips/VxD_drivers.htm
But sadly it didn't work for me...
Its interesting that ECS got SLATED over this configmg error and some bright spark soldered a resistor onto his board which seemed to work. It was put down to a SiS chipset needing to be at a certain temperature - i used this fix and it worked.
Could it be that a conventional system fan could be placed hear the nvidea heatsink to solve this problem? As configmg errors can be motherboard related, could this explain poor memory compliance? Could this explain its refusal to home my little geforce2 gts...?
And the answer is YES. The chipset cooler is inadequate. 8o
**The configmg errors have stopped.**
I used a standard 80mm case fan and modified it using a 2l plastic coke bottle so as to channel the air onto the heatsink without damaging it. Previously it was difficult to get windows to load. Now it has succsesfully loaded 10 times.
**I am now using the default memory timings without a problem - thats 6,3,3 Cas2.5**
Bear in mind that I tried these timings with my matroxg450 previously, and it resulted in crashes.
Now for the final test... I shall trawl out my geforce2 GTS - source of all my initial troubles with this board - could it be that the performance of this board was straining the chipset when it wasn't properly cooled, or is it still a device driver issue?
Well, during instillation of the drivers I got 2 VxD BSODS. I tried 20.xx 30.xx and 40.xx which all failed to produce an image using directx 8.1. Guess this board just doesn't like the card.

Noobie problem with voltage regulator simulation

Try putting a load resistor from each output to ground. Depending on the construction of the model for the regulator, it is possible that it needs a minimum load.
Lynn

Thanks Lynn I tried that with a 1k load and that resulted in an output voltage of -5.3V, which is still completely unsatisfactory from a simulation package.
I swapped the LM7905 for another -5V regulator, the UPC7905, which gave the correct output but failed after a few seconds. The convergence assistant suggest to switch the integration to the Gear algorithm, which resulted in a stable and correct output.
So I went back to the LM7905 but that still resulted in the incorrect output.
So Multisim cannot simulate the output of a garden variety, ultra common, component like the LM7905. This is unacceptable.
Perhaps changes to other options in the "Custom Analysis Options" dialog will improve the convergence. If anyone has suggestions I would be most gratefull.
Thanks
George

How to make more voltage sources in multisim

I am using MultiSim (power pro version 10) for schematic entry on a moderately complex design. It has 5 different voltage sources and 3 different grounds. The component library only has 4 DC sources (VCC, VDD, VEE, VSS) and 2 grounds (GROUND and DGND). How do I make more? I am not simulating but I will be using this to make a board with UltiBoard.
I've tried renaming the Label and value on a VCC (to VC1 for example) and if I say no to the question that follows I get a new source (without editing all VCC on the page). Sounds good but when I copy and paste that object, I always get the unedited original VCC again (that seems like a bug). I also tried copying that new component to the user library but was denied because it is virtual. What is the best practice method intended by the program to deal with additional supplies?
On a similar note, How do I label a node so I can use it on the same page. I tried an offpage connector and HB/SB connector but you can only use it once per page. What if I have a several subcircuits using ther same signal on the same page and I do not want to draw a wire between them. I would rather have the label name showing (similar to how an offpage connector looks).
I tried placing a junction then drawing a wire to that spot then naming the node but if I turn off node names, the label disappears from the page. Is there a more universal way than doing this. Furthermore, if I try to copy/paste the node, all I get is the junction which assumes the node name of whatever I connect it to (just like a normal junction) the node is not copied.
If there is no way of copying a node or edited DC source around a page or to other pages than I quess I would be stuck editing each node's properties individually which is inefficient. I am mainly looking for someone a little more experienced to tell me I am not wasting time.

I can answer one of your questions about node labeling. If you put a wire from your component to a junction connector then you can label that node to what you want. If you want more component pins tied to the same node, just do the same thing to each one and label it to the first node. I will post a simple circuit showing this for you to look at. It is called Virtual Wiring and the circuit will simulate with it.
Hears the Example circuit. Notice that all the nodes that are supposed to be connected together have the same name.
Edit: Sorry, it seems like you have already tried this. If you leave them on it does show up in the print Preview. So I would assume it would print them if that is what you are wanting.
Message Edited by lacy on 09-10-2007 06:33 PM
Kittmaster's Component Database
http://ni.kittmaster.com
Have a Nice Day
Attachments:
Virtual Wring Example.ms10 ‏37 KB

I am traveling to Spain and have a plug adaptor for my I phone 5. My power cord says it accepts 220 voltage, do I need to buy a voltage regulator or can I just use my regular power cord

I am travelling to Spain and purchased the plug which allows me to plug in my charging cable. Since the voltage there is 220 do I need a voltage converter. The tech at Radio Shack said no because the iphone plug lists the voltage as 100 to 220.

All genuine Apple power packs are multi voltage
100-240v 50/60hz and will work anywhere so no you just need the pin converter

If you are traveling in Europe, do you need both an adapter AND a voltage regulator to charge the IPad2 and the iphone? Or, the reverse, will it hurt either if I use both the adapter AND the voltage convertor?

If you are traveling in Europe, do you need both an adapter AND a voltage convertoro charge the IPad2 and the iphone? Or, the reverse, will it hurt either if I use both the adapter AND the voltage convertor?

You may only need adapters for the different kind of sockets, depending of the country you want to travel. A voltage converter is not needed.
The Apple power units are multi voltage devices, supporting a range from 110 V to 240 V. as you can see on the labels. O.K. for most of the labels you need a magnifier, but its on them.
Have a pleasnt journey
Lupunus

**** ATX Power Supply +28V Step-Up Voltage Regulator How to ****

I'm going to try this with an atx supply for a spare MDD I have.
Here is the schematic:
http://homepage.mac.com/baakre/public/files/28v_vreg.pdf
Here is a thread on a diy job (have not finished reading it so I don't know the results yet)
http://episteme.arstechnica.com/eve/forums/a/tpc/f/8300945231/m/4820959925/p/2

Look in the example finder for DAQmx functions for analog input and analog output.

DS1809 and LP2951 multisim models

Hi,
I am looking for the models of DS1809(digital potentiometer) and LP2951(voltage regulator) for multisim and pspice. Could you please help? It is very urgent.

Sorry for the late reply. Those two models don't seem to exist in the Multisim master database. What you can do is to create your own customized components that meet you needs. Unfortunately we are not responsible for taking care of that part. To do so, please check the thread below:
https://decibel.ni.com/content/groups/circuit/blog/2011/04/06/component-creation-101
Hope this helps.
Derek Z.
National Instruments

MSI K7N2 Delta ILSR voltage regulators BURNING!!!

I had to test this motherboard because it was giving boot problems and it never lasted more than 2 minutes.
I set stock clocks for the CPU and also stock voltages. I set downgraded clocks and even voltages, stability was improved but no more than 5 minutes.
After checking the board looking for something abnormal, I found the voltage regulator heatsinks too hot!!!.
Has someone got a similar problem??? Because I want to know before I try RMA, here in Argentina everyone with this mobo has some sort of problem. I think this mobo s---s but
I have to fix the problem in some way.

The hardware I´m running is the signature´s hardware except, obviously, for the motherboard.
I tested this mobo with my hardware, beacuse I´m sure it works correctly.
I don´t have my PSU specs because I changed the cover and it doesn´t have the sticker where it shows the currents.
It´s a 350 W Sunshine PSU, the one that is listed in my signature.
But I don´t think it´s a PSU problem, because I´ve already tested it with another PSU, a
Thermaltake one, and the problem persists.
I had the idea to add a fan to the heatsinks, I did this and stability was improved, so I´m almost sure that the problem is on the mobo and I´ll have to send it to RMA, but still any suggestions wil be apreciated

Core voltage stability on 865PE Neo2 PFS

I've just installed one of the new P-series NEO-2 MOBO's. Nice piece of work, although it seems there is still some work left to be done. Definite problems (although not serious) in Core center (althoug other posts indicate this may be indiginous to core center itself..)
More serious though is a reading of the processor core voltage.
I'm using a Celery 2.6, OC'd to 3.25G, FSB 125. Had to raise core voltage to 1.6V to get there, lower voltage led to crashes as low as FSB 104...
Recently, I looked at a scan of the core voltage (provided by Speedfan):
The problem lies in the fact that during disk access and/or high processor load, the core voltage drops as much as 90 mV, bringing it back to its default setting (spikes in graph, longer drop was writing DVD, CPU benchmark has similar result).
If it does this at 1.5V, I can understand the crashes.
I get the impression this board could do MUCH better with more stable voltage regulation.
Anyone seeing similar behaviour in other Neo2-boards? Am I missing a setting?(core-cell may be intervening) It's hard to imagine the PSU can't hack it.. 12V level is rock solid.
System: MSI 865PE Neo2 PFS, Celeron 2.6G @ 3.25G (125 FSB)
1x corsair 3200 512MB @ 333
POV 5600 VIVO
WD800BB 80GB
PSU: HEC 350 VD-PT (3.3V@28A, 5V@33A, 12V@15A)

I'm not worrying. Just a bit surprised we all make a bug fuzz about overclocking, increasing core voltage by 25 mV at a time, and suddenly ignoring it all and "accepting" 70 mV drops if we need processing power...
If the voltage regulator would be more robust, it would be able to maintain the Vcore to (much?) higher power ratings.
This board drops by roughly 70 mV, constituting 3 notches on the voltage setting tab.
I went up to 1.6V, and what I actually get is 1.52.....
To have 1.6 available under all conditions, I'd need to set to 1.7 (yes, I've tried), which is over the top for "normal" overclocking (not to mention considerably higher temperatures).
Anyway, I'd like to know what other boards are doing regarding Vcore stability. Anyone out there with additional data?
Maybe a new target for modifications? (if it's worth it...)

LM1085 Voltage regulator in Multisim

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