Part Number:DRV8432
Dear experts,
we are using DRV8432 in parallel mode at maximum power. To handle the thermal issues, we have attached a system of heatpipe and fan.We are in succsessful in mass production since almost three years. Actual we recognize an extended number of OTW warning events during device qualification tests.
As the maximum load is pulsing two times a second, The temperature of the chip seems to swing quickly. We realized that the OTW event does happen and resets after 100-200ms. With thermal hystersis of 25°C it suprises me that chip and heat system is able to cool down and reset OTW event so quickly. Is that thinkable? It depends much on the internal design and the thermal connection between sensor and MOSFET, does it? Or is it a proof, that the heat system is mounted not sufficent to the chip?
In ambient temperature, how quickly might the chip cool down without any cooling system? What are typical cooling times values e.g on the evaluation board?
Thanks and best regards,
Sebastian