Truth Table
Input Output Status Current
Sense
level level level I
IS
Normal
operation
L
H
L
H
H
L
0
nominal
Current-
limitation
L
H
L
H
H
H
0
0
Short circuit to
GND
L
H
L
L
16
)
H
H
0
0
Over-
temperature
L
H
L
L
H
H
0
0
Short circuit to
V
bb
L
H
H
H
L
17)
L
0
<nominal
18)
Open load L
H
L
19
)
H
H (L
20)
)
L
0
0
Undervoltage L
H
L
L
H
L
0
0
Overvoltage L
H
L
L
H
L
0
0
Negative output
voltage clamp
L L H 0
L = "Low" Level X = don't care Z = high impedance, potential depends on external circuit
H = "High" Level Status signal after the time delay shown in the diagrams (see fig 5. page 12...13)
16)
The voltage drop over the power transistor is
V
bb
-
V
OUT
>typ.3V. Under this condition the sense current
I
IS
is
zero
17)
An external short of output to V
bb
, in the off state, causes an internal current from output to ground. If R
GND
is used, an offset voltage at the GND and ST pins will occur and the V
ST low
signal may be errorious.
18)
Low ohmic short to
V
bb
may reduce the output current
I
L
and therefore also the sense current
I
IS
.
19)
Power Transistor off, high impedance
20)
with external resistor between pin 4 and pin 6&7
Data Sheet 7 V1.1, 2008-19-08
Smart High-Side Power Switch
BTS640S2G
