Datasheet

BTS4175SGA
Diagnostic Mechanism
Data Sheet 19 Rev.1.0, 2008-04-29
If the channel is OFF, the output is no longer pulled down by the load and
V
OUT
voltage rises to nearly V
S
. This is
recognized by the device as open load. The voltage threshold is given by
V
OL(OFF)
. In that case, the ST signal is
switched to a logical low
V
STL
.
Figure 13 Open load detection in OFF electrical equivalent circuit
Figure 14 ST in open load condition
OUT
V
S
R
leakage
R
OL
S
OL
V
bat
V
OL(OFF)
I
leakage
I
LOFF
OL
comp.
Open Load i n OFF .vs d
GND
R
GND
R
PD
BTS4175SGA
IN
V
OUT
ST
I
L
Diagnostic In Open load full diag.vs
t
t
t
t
V
ST(HIGH)
V
OL(OFF)
V
ST(LOW)