Datasheet

BTS5045-2EKA
Power Stage
Data Sheet 16 Rev. 2.1, 2011-09-01
PROFET™+ 12V
5.3 Inductive Load
5.3.1 Output Clamping
When switching OFF inductive loads with high side switches, the voltage V
OUT
drops below ground potential,
because the inductance intends to continue driving the current. To prevent the destruction of the device by
avalanche due to high voltages, there is a voltage clamp mechanism
Z
DS(AZ)
implemented that limits negative
output voltage to a certain level (
V
S
- V
DS(AZ)
). Please refer to Figure 10 and Figure 11 for details. Nevertheless,
the maximum allowed load inductance is limited.
Figure 10 Output Clamp (OUT0 and OUT1)
Figure 11 Switching an Inductive Load Timing
V
BAT
V
OUT
I
L
L, R
L
V
S
OUT
V
DS
LOGIC
IN
V
IN
Output clamp.svg
Z
DS(AZ)
GND
Z
GND
IN
V
OUT
I
L
V
S
V
S
-V
DS(AZ)
t
t
t
Switching an inductance.vsd