SLVSE19B June 2019 – November 2021 TPS1HB50-Q1
PRODUCTION DATA
The 45 W heater load will cause a DC current in the channel under maximum load power condition of around 3.3 A. Therefore, this current at 13.5 V will assume worst case heating.
Power dissipation in the switch is calculated in Equation 4. RON is assumed to be 100 mΩ because this is the maximum specification at high temperature. In practice, RON will almost always be lower.
This means that the maximum FET power dissipation is 1.09 W. The junction temperature of the device can be calculated using Equation 6 and the RθJA value from the Specifications section.
The maximum junction temperature rating for the TPS1HB50-Q1 is TJ = 150°C. Based on the above example calculation, the device temperature will stay below the maximum rating even at this high level of current.