Smart High-Side Power Switch
BTS5231-2GS
Block Description and Electrical Characteristics
V
OUT
V
bb
t
V
OUT(CL)
I
L
t
IN = 5V
IN = 0V
InductiveLoad.emf
Figure 8
Switching an Inductance
Maximum Load Inductance
While demagnization of inductive loads, energy has to be dissipated in the BTS5231-
2GS. This energy can be calculated with following equation:
V
OUT(CL)
V
bb
L
-
E
=
(
V
bb
–
V
OUT(CL)
) ⋅
----------------------
⋅
ln
1
–
----------------------
+
I
L
⋅
------
-
R
L
R
L
V
OUT(CL)
This equation simplifies under the assumption of
R
L
= 0:
(1)
V
bb
2
1
-
E
=
--
LI
L
⋅
1
–
----------------------
-
2
V
OUT(CL)
(2)
The energy, which is converted into heat, is limited by the thermal design of the
component. See
for the maximum allowed energy dissipation.
VBB=13.5V
100
EAS(mJ)
10
1
1
1,5
2
2,5
IL(A)
3
3,5
4
Figure 9
Data Sheet
Maximum Energy Dissipation Single Pulse,
T
j,Start
= 150
°C
12
V1.2, 2008-09-01
INFINEON [ INFINEON TECHNOLOGIES AG ]
