BTS721L1
Open-load detection,
OUT1...4
ON-state diagnostic condition:
V
ON
< R
ON
·
I
L(OL)
; IN high
+ V bb
GND disconnect with GND pull up
(channel 1/2 or 3/4)
IN1
V
IN1
IN2
V
IN2
ST
Vbb
OUT1
PROFET
OUT2
GND
ON
V
ON
OUT
Logic
unit
Open load
detection
V
V
bb
ST
V
GND
Any kind of load. If V
GND
>
V
IN
-
V
IN(T+)
device stays off
Due to V
GND
> 0, no V
ST
= low signal available.
OFF-state diagnostic condition:
V
OUT
> 3 V typ.; IN low
V
bb
disconnect with energized inductive
load
R
EXT
IN1
Vbb
OUT1
PROFET
OUT2
OFF
V
OUT
high
IN2
ST
GND
Logic
unit
Open load
detection
R
O
V
Signal GND
bb
GND disconnect
(channel 1/2 or 3/4)
V
Ibb
bb
IN1
IN2
ST
V
V
V
IN1 IN2 ST
Vbb
OUT1
PROFET
OUT2
GND
V
GND
For an inductive load current up to the limit defined by EAS
(max. ratings see page 3 and diagram on page 10) each
switch is protected against loss of Vbb.
Consider at your PCB layout that in the case of Vbb dis-
connection with energized inductive load the whole load
current flows through the GND connection.
Any kind of load. In case of IN = high is
V
OUT
≈
V
IN
-
V
IN(T+)
.
Due to V
GND
> 0, no V
ST
= low signal available.
Semiconductor Group
9
2003-Oct-01
INFINEON [ INFINEON TECHNOLOGIES AG ]
