SNVAA10 January   2021 LMR36015S , TPS54350-EP , TPS54354-EP , TPS543820E , TPS54622-EP , TPS62110-EP , TPS62111-EP , TPS62112-EP , TPS629210E , TPSM5D1806E

 

  1.   Trademarks
  2. 1Applications for Switching Regulators that require ET ratings
  3. 2Challenges for Switching Regulators in ET environments
    1. 2.1 Solution Size vs. Thermals
    2. 2.2 Junction Temperature (TJ)
  4. 3Extended Temperature Solutions
    1. 3.1 Efficient PCB Thermal Design
    2. 3.2 Package Type
    3. 3.3 Power Modules
  5. 4Summary
  6. 5References

4 Summary

Every DC/DC switching regulator dissipates some amount of heat during the conversion process. A good thermal design will keep the junction temperature at a safe value under all operating conditions, but even in some applications the best thermal designs will not allow for the device to stay within its rated operating temperatures. It’s important to note that the operating junction temperature and ambient temperatures are interrelated. Ambient temperatures have a great effect on convective and radiative heat transfers. That is why a switching regulator is not only being limited by its rated operating junction temperature, but also ambient temperature. An extended temperature rated device is a perfect solution for applications where temperatures are outside the standard industrial operating range of -40°C to 85°C and/or designed in a small solution size.