bts550 Infineon Technologies Corporation, bts550 Datasheet - Page 10

• Manufacturer Part Number: bts550
• Description: Smart Highside High Current Power Switch
• Manufacturer: Infineon Technologies Corporation

Inverse load current operation
The device is specified for inverse load current
operation (V
feature is not available during this kind of operation
(I
sic drain source diode is conducting resulting in
considerably increased power dissipation. If the
device is switched on (V
dissipation is decreased to the much lower value
R
Note: Temperature protection during inverse load
current operation is not possible!
Inductive load switch-off energy
dissipation
Energy stored in load inductance:
While demagnetizing load inductance, the energy
dissipated in PROFET is
with an approximate solution for R L > 0 Ω:
Infineon Technologies AG
IS
ON(INV)
+
E
-
AS
= 0). With I
V bb
=
E
V
E
2
AS
I
I
V
* I
L
bb
IN
·
bb
R
IN
·
2
= E
L
L
OUT
(specifications see page 4).
(
V
IN
bb
bb
> V
= 0 (e.g. input open) only the intrin-
+ E
IN
+ |V
E
bb
IN
V
L
L
IS
- E
OUT(CL)
=
> 0V). The current sense
PROFET
IN
1 /
R
IS
V
2
PROFET
=
= 0), this power
·
bb
V
IS
∫
L
R IS
bb
|)
·
V
I
ON(CL)
R
I
IS
2
L
ln
IS
OUT
(1+
OUT
E AS
·
Z L
|V
i
L
{
(t) dt,
OUT(CL)
I
i (t)
L
L
R L
·
L
R
V
- I
OUT
L
L
|
E
)
E
E Load
+
-
R
L
10
Maximum allowable load inductance for
a single switch off
L = f (I L ); T j,start = 150°C, V bb = 12 V, R L = 0 Ω
L [µH]
Externally adjustable current limit
If the device is conducting, the sense current can be
used to reduce the short circuit current and allow
higher lead inductance (see diagram above). The
device will be turned off, if the threshold voltage of
T2 is reached by I
by R
again, the short circuit current is defined by I
and the device is shut down after t
function.
IN
Signal
100000
V
10000
*C
1000
100
V
Signal
GND
10
R
T1 will be reset. The device is turned on
1
V
T1
1
V bb
S
*R
IN
IS
C
. After a delay time defined
Data Sheet BTS550
V
10
PROFET
T2
V bb
d(SC)
100
2010-June-01
OUT
IS
with latch
R
IS
L(SC)
1000
R
Power
GND
load
I L [A]