Datasheet

Data Sheet 11 Rev. 1.3, 2010-03-16
Smart High-Side Power Switch
BTS721L1
Inductive load switch-off energy
dissipation
352)(7
9
,1
67
287
*1'
EE
(
(
(
(
$6
EE
/
5
(
/RDG
5
/
/
^
/
=
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)
|) OQ (1+
I
L
·R
L
|V
OUT(CL)
|
)
Maximum allowable load inductance for
a single switch off
(one channel)
5)
/ I,
/
T
j,start
= 150°C, V
bb
= 12 V, R
L
=0Ω
L [mH]






I
L
[A]