| 26.8 Short-Circuit Power Dissipation |
| The short-circuit power dissipation is given by |
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(Eq 26.13) |
| For the input waveform shown in Fig 26.81a, which depicts the short-circuit (Fig26.81b) in an unloaded inverter, |
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(Eq 26.14) |
assuming that  and  and that the behavior is symmetrical around  . |
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| with |
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Thus for an inverter without load, assuming that  , |
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where  is the period of the waveform. This derivation is for an unloaded inverter. It shows that the short-circuit current is dependent on  and the input waveform rise and fall times. Slow rise times on nodes can result in significant (20%) short-circuit power dissipation for loaded inverters. Thus it is good practice to keep all edges fast if power dissipation is a concern. As the load capacitance is increased the signifance of the short-circuit dissipation is reduced by the capacitive dissipation  . |
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