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BTS734L1 Datasheet(PDF) 10 Page - Siemens Semiconductor Group

Part No. BTS734L1
Description  Smart Two Channel Highside Power Switch (Overload protection Current limitation Short-circuit protection Thermal shutdown)
Download  16 Pages
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Maker  SIEMENS [Siemens Semiconductor Group]
Homepage  http://www.siemens.com/
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BTS734L1 Datasheet(HTML) 10 Page - Siemens Semiconductor Group

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BTS 734 L1
Semiconductor Group
10
Inductive load switch-off energy
dissipation
PROFET
V
IN
ST
OUT
GND
bb
=
E
E
E
E AS
bb
L
R
ELoad
R
L
L
{L
Z
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 (one channel)5)
L = f (IL ); Tj,start = 150°C, Vbb = 12 V, RL = 0 Ω
L [mH]
1
10
100
1000
3
4
5
6
7
8
9
10 11 12 13 14
IL [A]


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