Figure 4a: Overtemperature:
Reset if Tj <Tjt
IN
ST
V
OUT
BTS 426 L1
Figure 5b: Open load: detection in ON-state, open
load occurs in on-state
IN
td(ST OL1)
ST
t d(ST OL2)
VOUT
T
J
t
Figure 5a: Open load: detection in ON-state, turn
on/off to open load
IN
t
ST
d(ST)
td(ST OL4)
I
normal
L
open
normal
t
td(ST OL1) = 20 µs typ., td(ST OL2) = 10 µs typ
Figure 5c: Open load: detection in ON- and OFF-state
(with REXT), turn on/off to open load
IN
ST
t
d(ST)
V
OUT
V
OUT
I
L
open
I
L
open
t
t
The status delay time td(ST OL4) allows to ditinguish between
the failure modes "open load" and "overtemperature".
Semiconductor Group
11