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IGBT and SLLIMM IPM Slide 22

This slide reviews the advanced features and protections offered in ST’s current SLLIMM portfolio. Two features that stand out as unique with the SLLIMM devices are the smart shutdown feature on some of the devices and the interlocking function on all of them. The smart shutdown feature is a bi-directional control that not only allows the host MCU to shut down gate drive to the IGBTs in the event of a fault or for disabling output for other needs, but also allows the internal over-current comparator to rapidly shutdown drive to the IGBTs in an over-current condition without the latency involved in waiting for the host MCU to control this. As the pin is bi-directional, when the OC comparator pulls the pin low it can then signal the MCU through its connection to a bi-directional GPIO interface pin that it has encountered an over-current trip for that PWM cycle. The MCU can then count the cycles that the device has gone into over-current trip and enact a hiccup mode strategy to prevent the rapid stair-casing of IGBT junction temperature to failure, or demand a power-off reset and check for the reason for the over-current fault. The interlocking feature prevents the accidental simultaneous turn-on of the upper and lower IGBTs in any bridge leg that would cause it to be short circuited and fail. This could happen if the host MCU loses software control and accidentally asserts both IGBTs on. This feature expressly prevents such a condition by interlocking the drive of one IGBT in the bridge leg with the other, allowing only one on at a time. While the target applications include the illustrated home appliance products, they are not limited to just those, but many other industrial and commercial applications as well such as industrial motor control for conveyers, ventilation fans, industrial automation products, and more.

PTM Published on: 2015-03-31