Diode Reverse Recovery: A Switching-Current Pulse Differs from Steady Leakage

Identify the reverse-current event

ROHM describes reverse recovery with a peak reverse current and a recovery slope during switching. That transient waveform is distinct from a steady reverse-current condition. Primary reference: FRD reverse-recovery waveform.

Keep the preceding forward conduction, commutation event and observation interval with the result. A small steady leakage value cannot describe the peak or shape of the reverse-current transient. Conversely, a transition peak is not a claim that the same current continues indefinitely.

An invented waveform calculation

Assume a fictional triangular reverse-current pulse with magnitude 2 A at its peak and a total 50 ns base interval. Its area magnitude is ½×2×50 ns = 50 nC. The calculation expresses charge transferred during that assumed waveform, not a real diode test result.

In a separate invented steady condition, 5 µA sustained for 1 ms transfers 5 nC. These cases deliberately use different current histories and intervals. Neither a peak alone nor a steady current alone determines transferred charge without the associated time behavior. No source waveform or product value is reproduced.

Keep static and dynamic evidence separate

Prepare fields for steady reverse condition, preceding forward condition, transition waveform, peak, interval and any derived charge. Identify the actual device and test basis beside each field.

Ask which quantity the circuit assessment needs and whether two offered values represent comparable conditions. This worksheet distinguishes static and switching evidence without selecting a diode, prescribing commutation or claiming that one reverse-current number predicts complete converter loss.

Customer Questions

Primary References

These references support the technical principles discussed in this guide. The worked examples and review questions are educational.

• Primary reference: FRD reverse-recovery waveform