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BTS6143D Datasheet(PDF) 11 Page - Infineon Technologies AG

Part No. BTS6143D
Description  Smart Highside Power Switch
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Maker  INFINEON [Infineon Technologies AG]
Homepage  http://www.infineon.com
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 11 page
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Data sheet BTS 6143 D
Infineon Technologies AG
11 of 16
2003-Oct-01
Short circuit detection
Fault Condition: VON > VON(SC) (3.5 V typ.) and t> td(SC)
(typ.650 µs).
Overload detection
Fault Condition: VON > 1 V typ.
detection
circuit
Logic
unit
+ Vbb
OUT
V
ON
Short circuit
Short circuit is a combination of primary and
secondary impedance’s and a resistance’s.
PROFET
V
IN
OUT
IS
bb
RSC
I
IN
V bb
Z
L
SC
L SC
10mOhm
5uH
A
llowable combinations of minimum, secondary
resistance for full protection at given secondary
inductance and supply voltage for single short circuit
event:
0
5
16V
10
0
100
200
RSC
[mOhm]
15
L SC
300
[uH]
V
:
bb
18V
24V
30V
Inductive load switch-off energy
dissipation
PROFET
V
IN
OUT
IS
bb
E
E
E
EAS
bb
L
R
ELoad
L
RL
{
Z L
RIS
I
IN
Vbb
i (t)
L
Energy stored in load inductance:
EL = 1/2·L·I
2
L
While demagnetizing load inductance, the energy
dissipated in PROFET is
EAS= Ebb + EL - ER= VON(CL)·iL(t) dt,
with an approximate solution for RL > 0 Ω:
EAS=
IL· L
2·RL
(Vbb + |VOUT(CL)|) ln (1+
IL·RL
|VOUT(CL)|
)
Maximum allowable load inductance for
a single switch off
L = f (IL ); Tj,start = 150°C, Vbb = 12 V, RL = 0 Ω
0,01
0,1
1
10
100
1000
110
100
I_L [A]
L [m H ]




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