Datasheet

BTS5045-2EKA
Protection Functions
Data Sheet 24 Rev. 2.1, 2011-09-01
PROFET™+ 12V
Figure 18 Current Limitation (typical behavior)
6.5.2 Temperature Limitation in the Power DMOS
Each channel incorporates both an absolute (T
J(SC)
) and a dynamic (T
J(SW)
) temperature sensor. Activation of
either sensor will cause an overheated channel to switch OFF to prevent destruction. Any protective switch OFF
latches the output until the temperature has reached an acceptable value. Figure 19 gives a sketch of the
situation. The Δ
T
STEP
describes the device’s warming, due to the overcurrent in the channel.
A retry strategy is implemented such that when the DMOS temperature has cooled down enough, the switch is
switched ON again, if the IN pin signal is still high (restart behavior).
0
5
10
15
20
25
30
35
40
0 5 10 15 20 25
Drain source Voltage V
DS
(V)
Current Limit I
L(SC)
(A)
curr ent li mi tati on _45 m.vsd
I
L5( S C)
I
L28(SC)