SBOS820A September 2019 – June 2020 TMCS1100
The isolated input current safe operating area (SOA) of the TMCS1100 is constrained by self-heating due to power dissipation in the input conductor. Depending upon use case, the SOA is constrained by multiple conditions, including exceeding maximum junction temperature, Joule heating in the leadframe, or leadframe fusing under extremely high currents. These mechanisms depend on pulse duration, amplitude, and device thermal states.
Current SOA strongly depends on the thermal environment and design of the system-level board. Multiple thermal variables control the transfer of heat from the device to the surrounding environment, including air flow, ambient temperature, and PCB construction and design. All ratings are for a single TMCS1100 device on the TMCS1100EVM, with no air flow in the specified ambient temperature conditions. Device use profiles must satisfy both continuous conduction and short-duration transient SOA capabilities for the thermal environment under which the system will be operated.