IC-DX IC-Haus, IC-DX Datasheet - Page 8

• Manufacturer Part Number: IC-DX
• Description: UNIVERSAL DIGITAL SENSOR OUTPUT DRIVER
• Manufacturer: IC-Haus

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The iC-DX is reverse polarity protected via internal
circutry. As far as the maximum voltage ratings are not
exceeded, no possible supply combination at the line
side pins (VB, GND and OUT) can damage the chip.
Since the chip current consumption is relatively low,
discharging of the backup capacitor C1 can be very
slow, and injected charge through disturbances may
in general result in capacitor voltage exceeding maxi-
mum ratings, leading to malfunction or destruction of
circuitry and associated parts. Thus EMC require-
ments will afford more external circuitry.
shows the iC-DX with the additional protective device
D1, D2 and D3.
EN
IN
NEP
OUT
CIRCUIT PROTECTION
iC-DX
UNIVERSAL DIGITAL SENSOR OUTPUT DRIVER
Figure 7: Timing diagram in push-pull operation
Figure 9: Circuit schematic showing protective de-
ttrig()
mode
vices
tpio
Figure 9
100nF..
For over-voltage protection, the suppressor diodes
D1,D2 and D3 absorbs transients on supply line in-
jected externally on the cable. Clamp voltage of the
diodes should be rated slightly above maximum speci-
fied supply voltage.
These currents can be passed to ground or to VB
by the internal ESD diodes of the iC-DX. Whereas
negative current injection will simply be drained off to
ground, positive current injection will charge capacitor
C1 further to higher voltages. If not suppressor diodes
nor any other over-voltage protection is implemented,
the backup capacitor C1 should be kept small. A typi-
cal 100nF value is normally OK.
Suggested protective devices
At VB
voltage from 36V has to be chosen in order to minimize
the energie in iC-DX for higer Voltages. For example
Diode type like Vishay GSOT36C or PJSD36W from
Pan Jit should be enouch as protection.
CVOUT
Figure 8: Block diagram with EN and NEP internal
max
VOUT
OE
IN
of 36V, suppressor diodes with a breakdown
signals
DIGITAL INPUT
+
-
REG
5V
iC-DX
<150
VREF
&
&
C
High Side Switch
NEP
EN
Low Side Switch
36V
36V
Rev A3, Page 8/10
OUT
GND
VB
..30V
CVB
1μF
VB
GND
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