AAT4680 Datasheet, PDF (9/10 Pages) Advanced Analogic Technologies – Electronic Resettable Fuse

For example, if an application is specified to oper-
ate in 50°C environments, the PCB operates at
temperatures as high as 85°C. The application is
sealed and its PCB is small, causing R_θJA to be
approximately 150°C/W. Using Equation 2:
Eq. 3:
I_MAX ⁼
115 - 85
600 · 150
=
575mA
To prevent thermal limiting, the operating load cur-
rent in the application must be less than 575mA.
AAT4680
Electronic Resettable Fuse
4680.2006.05.1.2
9