IC-DX_14 Datasheet, PDF (6/9 Pages) IC-Haus GmbH – UNIVERSAL DIGITAL SENSOR OUTPUT DRIVER

iC-DX
UNIVERSAL DIGITAL SENSOR OUTPUT DRIVER
DESCRIPTION OF FUNCTIONS
Rev C1, Page 6/9
iC-DX is a current limited switching channel which
enables digital sensors to drive peripheral elements.
They are designed to cope with high driver currents.
The switches are reverse-polarity protected, feature a
free-wheeling circuit for inductive loads, and a current
limited output.
Reverse polarity protection
The pins VB, OUT an GND on the line side of the chip
are reverse polarity protected. As far as the maximum
voltage ratings are not exceeded, no possible supply
combination at the line side pins can damage the chip.
I(OUT)
Isc()lo
GND
3V
A
VB
B
36V
V(OUT)
C
Figure 1: OUT characteristic when Low side active
Output characteristics of OUT
The switching channel is current limited to a value be-
tween 150mA and 450mA. (cf. Electrical Characteris-
tics Nos. 103, 104). The current limitation works only
for voltages higher than 3 V at OUT resp. lower than
VBO − 3 V. For smaller output voltages the current lim-
itation is reduced in order to minimise the saturation
voltages without increasing the power dissipation. Fig-
ures 1 and 2 show the characteristic of the switching
channels when activated. Region "A" is the saturation
range, where the current limitation is not fully active yet
and region "B" is the current limited range. Region "C"
corresponds to the free-wheeling circuit activated. The
switching channel is designed so that the low side can
only sink current and high side can only source current
(no reverse current).
Free-wheeling circuit for inductive loads
The free-wheeling circuit is always present and does
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).
VB-36V
C
I(OUT)
GND B
Isc()hi
A VB V(OUT)
VB-36V
I(OUT)
36V
GND
VB
V(OUT)
GND+36V
36V
36V
Figure 2: OUT characteristic when high side active
Figure 3: Free-wheeling characteristic
OPERATION MODES
The iC-DX can be operated in High-Side (PNP-
Switch), Low-Side (NPN-Switch) and Push-Pull switch
mode. Figure 4 shows the high-side operation where
IN pin must be kept high and the OE pin controls the
CVOUT
switch. Figure 5 shows the low-side operation where ^100nF..
IN pin must be kept low and the OE pin controls the ^CHEN
switch. Figure 6 shows the push-pull operation where
OE pin must be kept high and the IN pin controls the ^GND
switch.
VOUT
REG
+
5V
-
VREF
<150 C
DIGITAL INPUT
OE
IN
&
&
iC-DX
High Side Switch
36V
36V
Low Side Switch
VB
..30V
VB
CVB
1μF
OUT
OUT
GND
R Load
GND
Figure 4: Configuration as High-Side (PNP-Switch)