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UCC28251 Datasheet(PDF) 44 Page - Texas Instruments

Part No. UCC28251
Description  UCC28251 Advanced PWM Controller With Prebias Operation
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC28251 Datasheet(HTML) 44 Page - Texas Instruments

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UCC28251
SLUSBD8E – FEBRUARY 2013 – REVISED DECEMBER 2014
www.ti.com
11.2 Layout Example
Figure 54. Layout Example
11.3 Thermal Protection
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).
44
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Product Folder Links: UCC28251


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