SLUSBD8E February 2013 – December 2014 UCC28251
PRODUCTION DATA.
In order to increase the reliability and robustness of the design, it is recommended that the following layout guidelines be met.
Internal thermal shutdown circuitry protects the UCC28251 in the event the maximum rated junction temperature is exceeded. When activated, typically at 160 °C, with the maximum threshold at 170°C and minimum threshold at 150 °C the controller is forced into a low power standby mode. The outputs (OUTA, OUTB, SRA, SRB) are disabled. This helps to prevent accidental device overheating. A 20 °C hysteresis is added to prevent comparator oscillation. During thermal shutdown, the UCC28251 follows a normal start up sequence after the junction temperature falls below 140 °C (typical value, with 130 °C minimum threshold and 150 °C maximum threshold).