Datasheet

Data Sheet 12 Rev. 1.0, 2008-03-18
BTS4130QGA
Power Stage
5.3.1 Maximum Load Inductance
During demagnetization of inductive loads, energy has to be dissipated in the BTS4130QGA. This energy can be
calculated with following equation:
Following equation simplifies under the assumption of R
L
= 0Ω.
The energy, which is converted into heat, is limited by the thermal design of the component. See Figure 8 for the
maximum allowed inductivity.
Figure 8 Maximum energy dissipation single pulse, T
j,Start
= 150 °C
EV
DS AZ()
L
R
L
-------
×
V
S
V
DS AZ()
–
R
L
----------------------------------
1
R
L
I
L
×
V
S
V
DS AZ()
–
----------------------------------–


ln I
L
+××=
E
1
2
-- -
LI
2
1
V
S
V
S
V
DS AZ()
–
----------------------------------–


×××=
max eas.vsd
1
10
100
1000
123456
IL (A)
ZL (mH)