SNVSB14C April 2018 – October 2021 LM5036
PRODUCTION DATA
Two-level internal thermal shutdown circuitry is implemented in LM5036 device to protect the integrated circuit should its maximum rated junction temperature be exceeded. When the internal temperature is above the lower-level threshold of 150°C, the half-bridge converter is turned off and thereby the SS and SSSR capacitors are fully discharged.
Typically, the internal temperature should drop after the main half-bridge converter is turned off. However, if the temperature continues to rise above the higher-level threshold of 160°C, the auxiliary supply will be disabled in order to prevent the device from catastrophic failure due to accidental device overheating . Note that the internal VCC and REF bias regulators still remain active during thermal shutdown to provide the bias power for the external house-keeping circuitry.