Datasheet

BTS4300SGA
Diagnostic Mechanism
Data Sheet 18 Rev. 1.0, 2008-03-18
To reduce the stand-by current of the system, an open load resistor switch S
OL
is recommended.
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 12 Open load detection in OFF electrical equivalent circuit
Figure 13 ST in open load condition
OUT
V
S
R
leakage
R
OL
S
OL
V
bat
V
OL(OFF)
I
leakage
I
L(OL)
OL
comp.
Open Load i n OF F .vsd
GND
R
GND
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)