LM5009A

SNVS608G – JUNE 2009 – REVISED FEBRUARY 2013

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Thermal Protection

The LM5009A should be operated so the junction temperature does not exceed 125°C during normal operation.

An internal Thermal Shutdown circuit is provided to shutdown the LM5009A in the event of a higher than normal

junction temperature. When activated, typically at 165°C, the controller is forced into a low power reset state by

disabling the buck switch. This feature prevents catastrophic failures from accidental device overheating. When

the junction temperature reduces below 140°C (typical hysteresis = 25°C) normal operation is resumed.

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