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I did try to set this up in Mouser Blue Edition. Apparently vb and vs become connected at some point so the bootstrap capacitor can discharge itself. I haven't been able to see that happen in my simulator yet Mouser Blue encounters an unrecoverable problem and can't simulate anything (The second schematic is from Fairchilds):

enter image description here

I'm not sure I have it down really but if VB and VS are connected inside the IR2104 then it should look like this I think: enter image description here

Thank You

Eae
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1 Answers1

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This is a question about the weird behavior of your model, right? The wire between the diode and the capacitor is totally isolated as long as the diode is in reverse bias.

I would suggest adding a large (100 M\$\Omega\$) resistor in parallel with the capacitor and a similar resistor in parallel with the diode. There is always some leakage current across a capacitor or a diode, so this actually makes the component model more realistic. I bet the 5.99 V will pull down to 0 V in your model.

Dave Kielpinski
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