Dual Electronic Resettable Switch
T
SD(MIN)
is the minimum temperature required to
activate the AAT4682 over-temperature protection.
The typical over-temperature threshold specifica-
tion is 125°C; therefore, 115°C is a safe minimum
value to use.
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:
AAT4682
Eq. 3:
I
MAX
=
115 - 85
600
· 150
= 575mA
To prevent thermal limiting, the combined operating
load current of each output in the application must
be less than 575mA.
4682.2006.05.1.2
9
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
