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Old 26th March 2013, 08:59 PM   #11
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by Headbanger View Post
Hello, it's a really nice circuit. I wonder if I could use something like 555 generator to drive FETs?
You are free to use any square wave generator for this purpose. The 40106 is advantageous, because it is as cheap as a 555, consumes almost no power and has an inherent ~50% duty cycle, all of that with a minimal number of external components, but there are hundreds of alternative solutions.

Quote:
Also, could you please upload CD40106B.asy file so I can play with it in Spice?

Best regards, Vic.
Here it is, copied from my HD (remove the .txt). You can find the originals at the yahoo! LTspice group.
I have also included the CD4000 lib with the model (also available from the same source)
Attached Files
File Type: txt CD40106B - Copy.asy.txt (608 Bytes, 16 views)
File Type: zip 4000lib.zip (6.9 KB, 14 views)
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Old 26th March 2013, 09:04 PM   #12
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Yes, at the moment I am simulating it in TINA-TI with opamp based square wave generator. Would there be any advantages to increase frequency? I am probably gonna breadboard it, but atm I am just playing around in sim. I am quite unsure what is purpose of 10uF cap/22R resistor there. (C1/R2) Could you explain it, please?

Thank you for spice models and everything.

Cheers, Vic.
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Old 26th March 2013, 09:48 PM   #13
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by Headbanger View Post
Would there be any advantages to increase frequency?
Yes, the usual ones: smaller reactive components, lower ripple, etc, all of that is well documented.
Difficulties associated with increased frequency are as well documented, like increased losses. You have to choose your evil. Lower frequencies are generally more tolerant on components and less demanding on layout, etc, but require more physical space (moderate), which is why I have chosen this path.

Quote:
I am probably gonna breadboard it, but atm I am just playing around in sim. I am quite unsure what is purpose of 10uF cap/22R resistor there. (C1/R2) Could you explain it, please?
It provides a bootstrapped supply to the gate of M1, and is therefore essential for a decent efficiency when using NMOS only.

PS
Breadboarding is certainly possible, but you have to think carefully at how you are going to lay out your circuit to avoid common inductive loops, the effect of some contact resistances, etc
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Old 26th March 2013, 10:09 PM   #14
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Oh, now it makes sense. For breadboarding, I am aware of that, shouldn't be so bad, I have some experience with buck converters, and such. Anyway, I will give it a try asap, will let know what are the results.
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Old 23rd April 2013, 05:32 PM   #15
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I have simulated the circuit at 14.4v (automotive electrical system average with alternator on), and it outputs between 24-25v per rail into 4 ohms. Very nice.

Regarding the dual schottky rectifiers: does anyone recommend a substitution for these? The specified part is a dual diode in one package, and the circuit does not make use of them correctly (common cathode connection internal to the part)... Unless we are meant to connect them in parallel, which is not usually done with diodes, as they won't share current equally.
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Old 23rd April 2013, 07:17 PM   #16
Elvee is offline Elvee  Belgium
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Originally Posted by spare_parts View Post

Regarding the dual schottky rectifiers: does anyone recommend a substitution for these? The specified part is a dual diode in one package, and the circuit does not make use of them correctly (common cathode connection internal to the part)... Unless we are meant to connect them in parallel, which is not usually done with diodes, as they won't share current equally.
Yet that is exactly what I did. Of course, I have heaps of them, and this probably explains why I used and specified them in this case and in this way (it also brings the forward drop down a little), but you are perfectly free to use any other suitable component you have in store, paralleled or not. Perhaps you don't need all the power, and you can get away with smaller devices, or on the contrary you need to power a multichannel amp and could use 40A size. That's up to you.

Even non-schottky diodes would be usable, but the voltage loss and dissipation would be severe.

Similarly, the IRFZ44 choice could be challenged: there are now much better devices available, but these are cheap and widely available, and that is often an important factor for me.
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Old 23rd April 2013, 09:37 PM   #17
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Elvee, thank you for your many contributions to this forum
I am attracted to this charge pump converter because it does not require expensive (and/ or tedious to wind) magnetics, yet still provides a dual rail output. I will try to find some fast diodes that can handle the current, maybe MUR series... I will report my results.
Cheap and widely available are noble criteria, IMHO; we should be using what we can instead of throwing things away.

Last edited by spare_parts; 23rd April 2013 at 09:56 PM.
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Old 24th April 2013, 06:48 AM   #18
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by spare_parts View Post
I am attracted to this charge pump converter because it does not require expensive (and/ or tedious to wind) magnetics, yet still provides a dual rail output. I will try to find some fast diodes that can handle the current, maybe MUR series....
It will work of course, but the output voltages will be 1 or 2V lower, and the efficiency will also be slightly degraded (which means you will need larger heatsinks)
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