iC-DXC
DIGITAL SENSOR I/O DRIVER
Rev A0.8, Page 7/11
DESCRIPTION OF FUNCTIONS
iC-DXC is a current limited switching channel which Output characteristics of OUT
enables digital sensors to drive peripheral elements. The switching channel is current limited to a value be-
They are designed to cope with high driver currents. tween 150mA and 450mA. (cf. Electrical Characteris-
The switches are reverse-polarity protected, feature a tics Nos. 103, 104). The current limitation works only
free-wheeling circuit for inductive loads, and a current for voltages higher than 3 V at OUT resp. lower than
limited output.
VBO − 3 V. For smaller output voltages the current lim-
itation is reduced in order to minimize the saturation
voltages without increasing the power dissipation. Fig-
Reverse polarity protection
The pins VB, OUT an GND on the line side of the chip ures 1 and 2 show the characteristic of the switching
are reverse polarity protected. As far as the maximum channels when activated. Region "A" is the saturation
voltage ratings are not exceeded, no possible supply range, where the current limitation is not fully active yet
combination at the line side pins can damage the chip. and region "B" is the current limited range. Region "C"
corresponds to the free-wheeling circuit activated. The
I(OUT)
switching channel is designed so that the low side can
only sink current and high side can only source current
(no reverse current).
Isc()lo
Free-wheeling circuit for inductive loads
The free-wheeling circuit is always present and does
GND
V(OUT)
not depend on the current output status. It is acti-
vated by voltages higher than 36 V at OUT referenced
to GND or lower than -36 V at OUT referenced to VB.
In that case the correspondent channel will switch on
without current limitation (see Figure 3).
3V
VB
A
B
C
36V
Figure 1: OUT characteristic when Low side active
I(OUT)
I(OUT)
36V
VB-36V
C
GND
B
A
V(OUT)
VB
VB-36V
V(OUT)
Isc()hi
GND
VB
GND+36V
36V
36V
Figure 2: OUT characteristic when high side active
Figure 3: Free-wheeling characteristic
ICHAUS [ IC-HAUS GMBH ]
