Other Parts Discussed in Thread: DRV8301
Hi, my DRV8323S is overheating when operating at a VM of 48V and applying PWM to 3 phases. This seems to be a problem at 36V+. When the board sitting on the bench in open air, the DRV8323 case surface temperature reaches 150C in under 2 minutes. Eventually, it will trigger thermal fault/warning/shutdown. If the board is enclosed, the driver will fail and need to be replaced. I've isolated the current draw of the chip and I only read 62mA peak, but I will test this again when the package gets hot, to be sure. Is this heat to be expected at 48V, even though the device is rated to 60V? How can I keep it from getting above 125C?
Attached are the driver and half-bridge schematic. Thank you.