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It could also be Trr of the fly back diodes, (body diodes of the fets) If inductive current is flowing in them. If so, use schottkys to reduce it. Al D.

Sorry..that's not a problem. I meant the Adj pin current problem. Datasheet: For (Vin = 11.25 V, Iout = 800ma) Iadj = 52uA typical But I'm seeing Iadj = 17.7 mA

hitec92407 wrote: "I'm having the same issue with the NCP1117_adj1-x model..." Which problem was that? There was more than one problem in this thread. If the error message was "Unknown sub circuit

In this circuit, it's not the gate capacitance or gate charge that causes the current spikes. There is little or no overlap in the gate drive signals at the gates themselves. You can force them to not

Just asking for a button that calls the users default webbrowser(and provide a url to the browser?? (chrome,IE,FF) or whatever. The user's default browser would open the page. I realize the user could

Rick, Is there any relation between Qgate and drain to source current? Why by changing the model of the mosfet the drain-source current has changed? which parameter of mosfet cause this changing?

Hamed, Rds is the resistance from drain to source, when the FET is on. It is not very important in this application. Qgate is the charge in the gate and that is the main factor in switching delays.

Hi I'm having the same issue with the NCP1117_adj1-x model... After reviewing the previous messages in this thread, the resolution is not clear. :-( Can anyone help?

Rick, I test the gate current and the current between two mosfets in two situation 1- with BSC42DN25NS3 mosfet (Rds=425 mohm , Qgate=3nC) Gate current =100mA Drain-Source current =1.1 Ampere 2- with

I don't see it that way, at all. If you could specify a URL to a LTspice project file instead of a file path, then students could load it via the URL and run it on their machine. Think "poor man's"

LTspice would not need to handle it, it just passes the URL to the default browser to handle, it not a very difficult thing to program a lot of software have that feature. -- Cecil - k5nwa <

That sounds like a useful feature that I would not mind seeing also. Have a link in the drawing to a page that explains it or was the basis for the circuit. If it doesn't exist an email to Mike might

I think what you are asking, is for LTspice to include a fully functional web browser. In my opinion, that is neither practical, nor appropriate. BTW, LTspice does have the capability to input (i.e.,

Write to the author, Mike Englehardt, at the address in the "About LTspice" dialog. Jim Wagner Oregon Research Electronics.

Is there any facility to have a user click on an external page link from within ltc. Could this be added if not? As an educator I visualize using ltc spice to provide tutorials using html turorial

Hamed, I didn't look at your revised circuit, but it takes a long time to remove the gate charge due to the relatively large resistors in series with the gates. Rick

Finally I improve this problem with connecting the negative pin of V3 to the connection between two mosfets. http://www.4shared.com/file/L8gZ_TpG/halfbridge1.html

It is not difficult to see the problem. The upper MOSFET operates as a voltage follower. The gate drive is 20V, hence the 16V voltage at the source. The high-side driver must be modified. You may use

Hamed, M1 is a source follower, so the source voltage will be less than the gate voltage. Rick

The gate of M1 is only 10V above ground, not 10v above the Source voltage....