Transcription of Power MOSFET Avalanche Design Guidelines
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Power MOSFET Avalanche Design Guidelines
VISHAY SILICONIX. Power mosfets Application Note AN-1005. Power MOSFET Avalanche Design Guidelines TABLE OF CONTENTS. Page Table of 2. Introduction .. 3. 3. Avalanche Mode Defined .. 3. Avalanche Occurrences in Industry 3. Flyback Converter 3. Avalanche Failure 4. Power MOSFET Device 4. Rugged 5. Avalanche Testing Details .. 7. Single Pulse Unclamped Inductive Switching .. 7. Decoupled VDD voltage 7. Avalanche Rating .. 8. EAS Thermal Limit Approach .. 8. Single Pulse Example .. 8. Repetitive 10. Buyer 12. APPLICATION NOTE. Conclusion .. 13. The purpose of this note is to better understand and utilize Power mosfets , it is important to explore the theory behind Avalanche breakdown and to understand the Design and rating of rugged mosfets .
instead, a voltage derating is maintained between rated BVDSS and VDD (typically 90 % or less). In such instances, however, it is not uncommon that greater than planned for voltage spikes can occur, so even the best designs may encounter an infrequent avalanche event. One such example, a flyback converter, is shown in figures 1 to 3.
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