Datasheet
SLUS198C – FEBUARY 2000 - REVISED - JUNE 2001
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
For worst-case constant-current load of value just less than the trip limit; C
OUT(max)
can be estimated from:
C
OUT(max)
[
ǒ
I
MAX
* I
LOAD
Ǔ
ǒ
16.1 10
3
C
T
V
OUT
Ǔ
Where V
OUT
is the output voltage.
For a resistive load of value R
L
, the value of C
OUT(max)
can be estimated from:
C
OUT(max)
[
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȡ
Ȣ
16.1 10
3
C
T
R
L
ȏn
ȧ
ȧ
ȧ
ȱ
Ȳ
1
1*
V
OUT
I
MAX
R
L
ȧ
ȧ
ȧ
ȳ
ȴ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȣ
Ȥ
Long C
T
times must consider the maximum temperature. Thermal shutdown protection may be the limiting fault
time.
safety recommendations
Although the UCC3915 is designed to provide system protection for all fault conditions, all integrated circuits
can ultimately fail short. For this reason, if the UCC3915 is intended for use in safety-critical applications where
UL or some other safety rating is required, a redundant safety device such as a fuse should be placed in series
with the device. The UCC3915 will prevent the fuse from blowing for virtually all fault conditions, increasing
system reliability and reducing maintenance cost, in addition to providing the hot-swap benefits of the device.