Datasheet

Smart High-Side Power Switch
BTS50080-1TMA
Protection Functions
Datasheet 18 Rev. 1.0, 2008-01-23
6.4 Over-Voltage Protection
Beside the output clamp for the power stage as described in Section 5.3 there is a clamp mechanism
implemented for all logic pins. See Figure 15 for details.
Figure 15 Over-Voltage Protection
6.5 Loss of Ground Protection
In case of complete loss of the device ground connections the BTS50080-1TMA securely changes to or remains
in off state.
6.6 Loss of V
bb
Protection
In case of complete loss of V
bb
the BTS50080-1TMA remains in off state.
In case of loss of V
bb
connection with charged inductive loads a current path with load current capability has to be
provided, to demagnetize the charged inductances. It is recommended to use a diode, a Z-diode, or a varistor
(
V
ZL
+V
D
< 30 V or V
Zb
+V
D
< 16 V if R
IN
= 0). For higher clamp voltages currents through IN and IS have to be limited
to -120 mA. Please refer to Figure 16 for details.
Figure 16 Loss of V
bb
OverVolt age .emf
IN
R
bb
V
bb
Logic
V
Z,IS
V
Z,IN
IS OUT
IN
R
bb
V
bb
Logic
IS
V
bb
R
IS
R
IN
V
D
V
ZL
inductive
LOAD
Vbb_disconnect_A.emf
IN
V
bb
Lo g ic
IS
V
bb
R
IS
R
IN
inductive
LOAD
V
D
V
Zb
Vbb_disconnect _B. emf
R
bb