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What are the considerations when using MOSFETs in parallel?
When MOSFETs are used in parallel, a current imbalance is caused during switching transitions by a mismatch between each device characteristics and between circuit wiring layout of each MOSFETs.
This current imbalance could increase power losses and lead to destruction of a MOSFET. Exercise care concerning current imbalance.
Preventing this current imbalance.
- Make a symmetrical layout of circuit wiring.
- Assemble MOSFETs to one heatsink so that the thermal dissipation condition is the same for each MOSFET.
- Use an external gate resistor for each MOSFET.
- Secure a large current margin, considering current imbalance.
Based on consideration of the above items, please confirm that your circuit does not have a problem.
For using MOSFETs in parallel, please refer to “MOSFET Paralleling (Parasitic Oscillation between Parallel Power MOSFETs): Power MOSFET Application Notes.”
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