BTS426L1
Semiconductor Group 8 2003-Oct-01
GND disconnect with GND pull up
PROFET
V
IN
ST
OUT
GND
bb
V
bb
1
2
4
3
5
V
GND
V
IN
V
ST
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.
V
bb
disconnect with energized inductive load
PROFET
V
IN
ST
OUT
GND
bb
V
bb
1
2
4
3
5
high
Normal load current can be handled by the PROFET itself.
V
bb
disconnect with charged external inductive
load
PROFET
V
IN
ST
OUT
GND
bb
1
2
4
3
5
V
bb
high
S
D
If other external inductive loads L are connected to the PROFET, additional
elements like D are necessary.
Inductive Load switch-off energy dissipation
PROFET
V
IN
ST
OUT
GND
bb
=
E
E
E
E
AS
bb
L
R
E
Load
L
R
L
{Z
L
Energy stored in load inductance:
E
L
=
1
/
2
·L·I
2
L
While demagnetizing load inductance, the energy dissipated in
PROFET is
E
AS
= E
bb
+ E
L
- E
R
=
V
ON(CL)
·i
L
(t) dt,
with an approximate solution for R
L
> 0 Ω:
E
AS
=
I
L
· L
2
·R
L
·(V
bb
+ |V
OUT(CL)
|)· ln (1+
I
L
·R
L
|V
OUT(CL)
|
)
Maximum allowable load inductance for
a single switch off
L = f (I
L
); T
j,start
=
150°C,T
C
=
150°C const.,
V
bb
=
12 V, R
L
=
0 Ω
L [mH]
1
10
100
1000
10000
2 7 12 17
I
L
[A]
