| PSUD/switchercad [message #8804] |
Tue, 01 February 2005 15:25  |
Manualblock
Messages: 4973
Registered: May 2009
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Illuminati (13th Degree) |
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Hi Douglas; Downloaded and ran PSUD today on Guenievere. Now I understand. Of course the secondary must be modeled unloaded, that is what it is telling us. Fully loaded would prevent the simulation from functioning. It's like looking on Mapquest to find out how to get where you already are.
I modeled the PS and it ran beautifully; with nice traces. I am not sure of the source resistance of the Trans though so I used the 30ohm default setting.
ESR I know what it is but what effect it might have on the circuit escapes me. I know it has more effect at high current on the high freq. but you said you really didn't notice much difference. Is there a point we need to be concerned with this? Do you think Switchercad is a usefull tool for the novice?
Thanks again glad I got straight on this.
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| Re: PSUD/switchercad [message #8807 is a reply to message #8806] |
Tue, 01 February 2005 19:37  |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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Hey-Hey!!!,
The 30 Ohms is close enough. I did not ask about DCR, but assume it will be reasonable.The current delivery is to a choke input filter. There are no large spikes of current being drawn to show up as voltage drop across a resistor. Figure 50 mA and see how much changing the resistance from 15R to 60R does for I*R voltage. It is fairly small.
regards,
Douglas almost done with the linestage construction...
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| Re: PSUD/switchercad [message #8808 is a reply to message #8807] |
Tue, 01 February 2005 20:15 |
Manualblock
Messages: 4973
Registered: May 2009
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Illuminati (13th Degree) |
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Thats the stuff; I can get right on it. I modeled it today with a C-L-C . Whats the chance we can see your version of the PS?
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