Smart High-Side Power Switch
BTS5231-2GS
Block Description and Electrical Characteristics
A high signal at the input pin causes the power DMOS to switch on with a dedicated
slope, which is optimized in terms of EMC emission.
IN
t
ON
t
OFF
t
V
OUT
90%
70%
70%
dV /dt
ON
30%
10%
dV /dt
ON
30%
t
SwitchOn.emf
Figure 6
Switching a Load (resistive)
4.1.3
Inductive Output Clamp
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.
V
bb
VBB
I
L
OUT
V
OUT
L,
R
L
OutputClamp .em
GND
Figure 7
Output Clamp (OUT1 and OUT2)
To prevent destruction of the device, there is a voltage clamp mechanism implemented
that keeps that negative output voltage at a certain level (
V
OUT(CL)
). See
and
for details. Nevertheless, the maximum allowed load inductance is limited.
Data Sheet
11
V1.2, 2008-09-01
INFINEON [ INFINEON TECHNOLOGIES AG ]
