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CLT3-4BT6-TR

P1-P3P4-P6P7-P9P10-P12P13-P13
Characteristics CLT3-4B
4/13
Figure 3. Typical junction to ambient thermal resistance versus copper surface
under common pad (FR4 epoxy, copper thickness is 35 µm)
1.1 Functional description
The CLT3-4 is a quadruple input digital termination device designed for 24 V DC automation
applications. It provides the front-end circuitry of a digital input module (I/O) in industrial
automation, and drives an isolating opto-coupler.
Available in a four channels configuration, it offers a high-density termination by minimizing
the external components count. It is housed in a TSSOP20 surface mount package to
reduce the printed board size.
Made of an input voltage protection, a serial current limiting circuit and an opto-coupler
driver, each channel circuit terminates the connection between the logic input and the
associated high side sensor or switch.
The CLT3-4 is a 3 mA quad channel device compatible the type 1 and 3 characteristics of
the IEC 61131-2 standard.
Each input voltage clamping block protects the module input against electromagnetic
interferences such as those described in the IEC 61131-2 standard and IEC 61000-4-2
(ESD), 4-4 (transient burst), 4-5 (voltage surge) standards. The supply input is also
designed with such a protection structure.
Table 5. CLT3 System electromagnetic compatibility ratings,
R
I
= 1.8 kΩ, R
C
= 4.7 kΩ (unless otherwise specified)
Symbol Node Parameter name and conditions Value Unit
V
PP
IN
ESD protection, IEC 61000-4-2, per input, in air ± 8 kV
ESD protection, IEC 61000-4-2, per input, in contact ± 6 kV
ESD protection, IEC 61000-4-2, per input, in air, R
I
= 0 Ω ± 3 kV
ESD protection, IEC 61000-4-2, per input, in contact, R
I
= 0 Ω ± 3 kV
V
PPB
V
I
Total Peak Pulse Voltage Burst, IEC 61000-4-4
C
IN
= 100 pF, C
OUT
= 22 nF, F = 5 kHz
(1)
1. Refer to Application note AN2527 for test conditions.
± 4 kV
V
PP
V
I
Peak Pulse Voltage Surge, IEC 61000-4-5, R = 42 Ω
(2)
2. See test circuit in Figure 12.
± 1 kV
V
PP
V
CC
Peak Pulse Voltage Surge, IEC 61000-4-5, R = 2 Ω
(2)
± 1 kV
0
20
40
60
80
100
120
140
160
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
S(cm²)
R ° C/W)
th(j-a)
(
CLT3-4B Characteristics
5/13
The current limiting circuit connected between the input and the output pins is compensated
all over the temperature range. Thanks to its low tolerance, the current limitation allows
reducing drastically the dissipation of the input compared to a resistive input: the overall
module requires less cooling capability and becomes smaller.
The output block of each termination channel controls the operation of an opto-coupler that
is enabled by a Light Emitting Diode.
When the input current is less than 1.5 mA, this output circuit derivates the input current to
maintain the opto-coupler off.
The original structure of the CLT limiter allows its activation threshold to be low and
insensitive to the output voltage up to a maximum value of 2.0 V.
When the CLT input voltage V
IN
is higher than 5 V, or the module input voltage Vi higher
than 11 V and a series resistor R
I
= 1.2 kΩ, the output current that is a share of the input
current (3/4) is higher than 1.5 mA. The whole termination channel including the opto-
coupler is on.
Depending on the input type operation that is described by the IEC 61131-2 standard, the
input resistance R
I
can be adjusted because of the different on-state threshold V
ON MIN
.
This document describes operation and characteristics for type 3 operation with
V
ON MIN
= 11 V and R
I
= 1.2 kΩ.
In type 1 operation the on state threshold V
ON MIN
is 12.34 V instead, and the input resistor
R
I
is set 2.2 kΩ.
1.2 Input characteristics of CLT3-4
Figure 4. Typical input characteristics of each CLT3-4 channel
30
25
20
15
10
5
0
30
5
3.7
0 0.5 1 1.5 2 2.5 3 3.5 4
V (V)
IN
I (mA)
IN
Off-state
On-state
Characteristics CLT3-4B
6/13
1.3 CLT3-4 Input / output transfer characteristics (with respect to
common pin COM)
Figure 5. Typical current limiter variation
versus junction temperature
0.9 V < V
OUT
< 2 V
Figure 6. Typical limiter threshold voltage
variation versus junction
temperature for I
IN
= 2.1 mA
I
Iim
/ I
Iim
(25° C)
84%
86%
88%
90%
92%
94%
96%
98%
100%
102%
-25 0 25 50 75 100 125
V
IN
= 27 V
V
IN
= 5 V
T
j
(°C)
3.2
3.3
3.4
3.5
3.6
-25 0 25 50 75 100 125
T
j
(° C)
V
TH
(V)
Figure 7. Current tranfer characteristic Figure 8. Transconductance characteristic
ISOLATOR ON
ISOLATOR OFF
Forbidden
Transition zone
Transition zone
0
0.5
1
1.5
2
2.5
3
3.5
4
0 0.5 1 1.5 2 2.5 3 3.5 4
0.04
2.1
3.7
I(mA)
IN
I(mA)
OUT
0
0.5
1
1.5
2
2.5
3
3.5
4
0 5 10 15 20 25 30
ISOLATOR ON
I (mA)
OUT
V (V)
I
P1-P3P4-P6P7-P9P10-P12P13-P13

CLT3-4BT6-TR

Mfr. #:
Buy CLT3-4BT6-TR
Manufacturer:
STMicroelectronics
Description:
Interface - Specialized Quad Digital Term
Lifecycle:
New from this manufacturer.
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