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H-Bridge-Slide16

The thermal sensor nearest to the hottest part of the die is next to the bond wires. Down at the lower edge of the die is another thermal sensor in the coldest part of the die. When there is a difference in temperature of 60°C that gives the indication between these two point powers, limitation is enabled. The graph, shown here on the left, is another representation of what happens when a device is driven into a shorted load. The bottom of the graph shows how the part heats up because it is current limiting between 30 and 60A. The part heats up to something between 150 and 200°C. The part then goes into thermal shutdown. When it hits the thermal shutdown, the output current limit will drop to the yellow box. It will cycle at the lower current level, even though it is still hot, reducing some of the stress for the part.

PTM Published on: 2014-12-19