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Monday Quiz: Measuring losses in power devices

25 May 2015  | Martin Rowe

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Answers

1. The principal losses in a MOSFET switch occur during:

The correct answer is e, turn-on, conduction, and turn-off. Leakage current is typically a negligible contributor to MOSFET switch loss.

2. Turn on power for a MOSFET is typically modelled as:

The correct answer is b, P = ID × VDS.

3. Which of the following is NOT a recommended set-up tip?

The correct answer is c, you should always stay well within the equipment's absolute maximum specifications and follow the manufacturer's instructions for use.

4. The vertical sensitivity and offset of each channel coming into the oscilloscope should be adjusted so the signals:

The correct answer is e, adjusting signals so that waveforms take up more than half the display provides the best visibility possible without losing detail.

5. Slew rate measurements can be made manually by placing cursors at which points on the waveform?

The correct answer is b, place cursors at the 10 per cent and 90 per cent points.


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