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 .
source contact is diffused. See figure 4 for power MOSFET cross section that incorporates the parasitic components listed above and figure 5 for a complete circuit model of the device. Fig. 4 - Power MOSFET Cross Section Fig. 5 - Power MOSFET Circuit Model In avalanche, the p-n junction acting as a diode no longer blocks voltage.
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