Data sheet BTS 6163 D
Short circuit detection
Fault Condition: VON > VON(SC) (3.5V typ.) and t> td(SC)
(typ.650 µs).
Inductive load switch-off energy
dissipation
E
bb
E
AS
Overload detection
Fault Condition: VON > 1V typ.
E
E
Load
L
V
bb
i (t)
L
V
+ V
bb
bb
OUT
PROFET
IN
VON
L
IS
{
Z
L
I
E
R
IN
R
OUT
R
L
IS
detection
Logic
unit
circuit
Energy stored in load inductance:
2
L
1
E = / ·L·I
L
2
Short circuit
While demagnetizing load inductance, the energy
dissipated in PROFET is
Short circuit is a combination of primary and
secondary impedance’s and a resistance’s.
E = Ebb + EL - ER= VON(CL)·i (t) dt,
AS
L
with an approximate solution for R > 0Ω:
L
V
OUT
bb
5uH
I ·L
L
I ·R
L L
OUT(CL)
E
=
(V +|V
|) ln (1+
)
AS
OUT(CL)
bb
L
2·R
|V
|
SC
SC
Z
L
PROFET
IN
10mOhm
Maximum allowable load inductance for
a single switch off
IS
R
I
L = f (I ); T
= 150°C, V = 24 V, R = 0 Ω
IN
L
j,start
bb
L
SC
V
bb
L
1000
L [m H ]
Allowable combinations of minimum, secondary
resistance for full protection at given secondary
inductance and supply voltage for single short circuit
100
10
1
event
:
L
SC
[uH]
15
V
: 32V 36V
40V
bb
48V
10
5
0,1
R
SC
300 [mOhm]
0
0
100
200
0,01
1
I_L [A ]
10
100
Infineon Technologies AG
Page 11 of 16
2003-Oct-01
INFINEON [ Infineon ]
