Using protective components and monitoring drain-source voltage, you can prevent these faults from damaging your circuit. MOSFETs can be damaged by avalanche breakdown faults over time. An avalanche breakdown might be indicated by voltage spikes.Ĭlamp Diodes and Snubbers: In order to suppress voltage spikes and protect the MOSFETs, use clamp diodes or snubber circuits. Voltage Monitoring: Use an oscilloscope to observe the drain-source voltage during load transitions. Usually, these faults occur when the drain source voltage is excessive due to inductive loads, load switching, or other transient events. The risks associated with gate oxide breakdown can be mitigated if you detect signs of increased leakage and carefully monitor voltage. The degradation of MOSFET performance and potential circuit failure may occur as a result of gate oxide breakdown faults. Voltage Monitoring: In order to ensure the gate-source voltage stays within safe limits, measure it against the specified limits on the MOSFET. Increased Gate Leakage: A high gate leakage current may suggest compromised gate oxide integrity. Gate Oxide BreakdownĪn excessive voltage exposure, gradual wear, or manufacturing defects can cause gate oxide breakdown. The gate-source voltage can be easily tracked and protective measures can be taken to prevent these faults. MOSFETs may suffer from gate-source overvoltage faults, which could compromise the overall reliability of the device. Transient overvoltages are protected from MOSFETs by these diodes. Transient Voltage Suppressors (TVS): A transient voltage suppressor diode should be connected across the gate-source terminals. A sudden spike or irregular pattern could indicate an overvoltage. Oscilloscope Observation: Monitoring the gate-source voltage waveform with an oscilloscope is an important part of operating the gate. Gate-Source Overvoltage FaultsĬause: Factors contributing to these faults include voltage spikes, electrostatic discharge (ESD), or transient events exceeding the gate-source voltage of the MOSFET. Improve circuit reliability with essential strategies for detecting and preventing MOSFET malfunctions. Guarding Your MOSFETs: Detecting and Preventing Common FaultsĪ guide to preventing critical faults in your circuits. This helps verify if the MOSFET is within its operational parameters. Compare the measured values with the specifications provided in the datasheet.Observe the behavior of the circuit, and check if the MOSFET is switching as expected.
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