Application information CLT3-4B
10/13
Depending on the input type operation the input resistance R
I
can be adjusted because of
the different on-state threshold V
ON MIN
. So the surge voltage is also increased from the
minimum level of the type 3 to the type as shown in Tabl e 6.
This combination allows the surge voltage to be applied from each input to other inputs, the
ground and the supply contacts in differential or common modes (see Figure 12).
Thanks to its high resistance R
C
= 4.7 kΩ, the supply pin V
C
withstands IEC 61000-4-5 with
±1000 V surge voltage (see Figure 12).
Finally, an external output capacitor may be placed in parallel with the opto-coupler diode to
filter the transient disturbances injected in the inputs of the module and secure the immunity
of the opto-coupler itself.
Figure 12. Input pin IN and supply pin V
C
voltage surge test circuit
Table 6. Setting the input resistor R
I
according to the input type operation
Type V
ON MIN
(V) R
I
(kΩ) V
PP
surge (kV)
1152.2 2
3 11 1.2 to 1.8 1
R
I
IN
1
R
I
IN
2
R
I
R
C
V
C
COM
P
V
CC
GND
PE/FE
-4
I
V
PPI
V
PPI
5nF
V
PPS
1 kV with 2
V
PP
V
PPI
1 kV with 42
V
PPS
R
I
IN
1
R
I
IN
2
R
I
R
C
V
C
COM
P
V
CC
GND
PE/FE
CLT3
I
V
PPI
V
PPI
5nF
V
PPS
= ± Ω
V
PP
V
PP
V
PPI
= ± Ω
V
PPS
