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CLT3-4B
Current limited over-voltage protected quad digital termination
Features

4 channel topology Wide range input dc Voltage: - VI= - 0.3 to 30 V with RI = 0 - VI = - 30 to 30 V with RI = 1.8 k - Low side configuration with common ground Current limiter: - IGEN = 3 mA - Input current limiter activation voltage < 5 V - Temperature compensated operation Opto-coupler drive: - No coupler activation below 1.5 mA input current Input protection (RI = 1.2 k): - IEC 61000-4-2 electrostatic discharge ESD, Class 3 In contact, 6 kV; in air, 8 kV Level B: temporary disruption; no change of opto-coupler state - IEC 61000-4-5 voltage surge, Class 3 1000 V with 42 serial resistor in differential mode Level B: temporary disruption - IEC 61000-4-4 transient burst immunity 4 kV peak voltage; 5 kHz repetitive rate Level A: fully functional Operating ambient temperature: - 25 to 85 C
TSSOP20
Applications

Industrial automation Programmable logic controller Communication field bus nodes Peripheral input / output modules Machine tool interface
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. Figure 1.
COM
Pin configuration
COM OUT1 OUT2 COM34 COM OUT3 OUT4 COM12 COM
20
19
18
17
16
15
14
13
12
11
Benefits

Reduced overall dissipation Compact with high integration Enables input to meet type 1 and 3 characteristic of IEC 61131-2 standard Compatible operation with 2 and 3 wires proximity sensor according EN60947-5-2 standard Insensitive to the on state sensor impedance Surface mount package for highly automated assembly Enhanced functional reliability
1
2
3
4
5
6
7
8
9
10
IN COM ESD12
IN2 VC
ESDC IN3
ESD34 IN4
COM
The pins ESD, COMIJ, COM (pins # 1, 3, 6, 8, 10, 11, 13, 15, 16, 18, 20) must be connected together externally. This common pad COM is enlarged to reduce the thermal resistance and improve the device cooling. The COM and IN pins are designed to minimize the EMI effects on the circuit.
November 2007
Rev 5
1/13
www.st.com
Characteristics
CLT3-4B
1
Characteristics
Figure 2. Functional block diagram
OPTO COUPLER DRIVER IN1 I1 ESD OVER VOLTAGE PROTECTION 0.75xILIM 0.25xILIM CURRENT LIMITER ILIM 1.5mA I1 OUT1
ESD12 ESD OVER VOLTAGE PROTECTION I2 IN2 OPTO COUPLER DRIVER Vc ESD Volt Prot ESDC IN3 I3 0.75xILIM ESD OVER VOLTAGE PROTECTION ESD34 0.25xILIM CURRENT LIMITER ILIM 1.5mA I3 OPTO COUPLER DRIVER BIASING CIRCUIT TO COMPARATORS
COM12
CURRENT LIMITER ILIM 0.25xILIM 0.75xILIM
1.5mA I2 OUT2
COM OUT3
COM34 ESD OVER VOLTAGE PROTECTION I4
CURRENT LIMITER ILIM 0.25xILIM 0.75xILIM
1.5mA I4 OPTO COUPLER DRIVER OUT4
IN4
Table 1.
Absolute ratings (limiting values)
Parameter VC Supply steady state voltage, RC = 0 k Supply steady state voltage, RC = 4.7 k Input steady state voltage, RI = 0 k Input steady state voltage, RI = 1.2 k Value - 0.3 to 30 - 30 to 30 - 0.3 to 30 - 0.3 to 32 - 0.3 to 35 - 30 to 30 5 20 2.5 - 4 to 4 - 25 to 85 - 25 to 150 Unit V V V V V V mA mA V mA C C
Symbol VCC
VI
(1)
IN
Input repetitive pulse voltage, RI = 1.2 k Input repetitive pulse voltage, RI = 1.8 k, RC = 4.7 k (2) Input maximum forward current, RI = 1.2 k, RC = 4.7 k Input maximum reverse current, RI = 1.8 k, RC = 4.7 k (2)
IIN
IN
VOM IOM TAMB TJ
OUT OUT AII
Maximum output steady state voltage Output current Operating ambient temperature Operating and storage junction temperature
1. VI = VIN + RI x IIN; VIN = voltage at the input pin itself 2. According to test diagram and design recommendations described in Section 2.2.
2/13
CLT3-4B Table 2.
Symbol Rth(j-a)
Characteristics Thermal resistance
Parameter TSSOP20 thermal resistance junction to ambient Board copper surface = 2 cm2, copper thickness = 35 m Value 90 Unit C/W
Table 3.
Symbol
Electrical characteristics (TJ = 25 C, VCC = 24 V and COM pin voltage referred unless otherwise specified)
Pin Name Conditions Current limitation Min. Typ Max. Unit
ILIM
IN
Input limiting current Maximum off state voltage Activation threshold
VOUT = 0.9 to 2.0 V VIN = 5 to 27 V TAMB = - 25 to 85 C IIN = 100 A IIN = 2.1 mA
2.1
3
3.7
mA
VLOW VTH
IN IN
1.5 3.4 5
V V
Input and Supply Protection VCL IN Clamping voltage IIN = 7 mA; tP = 1 ms VI = 5 V, (1) IIN = 1.5 mA, (2) IIN = 1.5 mA VIN = 5 V VIN = 4.2 V, VC = 10 V Supply and biasing circuit VC IC VC VC Supply voltage Supply current TAMB = - 25 to 85 C VIN = VC = 30 V 10 550 800 V A 1.5 1.5 31 38 V
Opto-coupler driver operation 10 10 0.15 2 2 40 40 0.5 A A V mA mA IOFF VOFF ION OUT OUT OUT Off state output current Off state output voltage On state output current
1. According to Figure 9: Robust application diagram on page 8 with use of a RI = 1.8 k resistor, and an opto-coupler (RLED (0 V) = 15 k) 2. According to Figure 9: Robust application diagram on page 8 with use of a RI = 0 k resistor, and an opto-coupler (RLED (0 V) = 15 k)
Table 4.
Symbol FMAX tPLH tPHL
Switching electrical characteristics (TJ = 25 C, VCC = 24V and COM pin voltage referred unless otherwise specified)
Pin Name Conditions Min. Typ 5 COUT = 22 nF COUT = 22 nF 6 10 Max. Unit kHz s s
IN-OUT Input to output running frequency IN-OUT Input activation propagation time IN-OUT Input de-activation propagation time
3/13
Characteristics Table 5.
Symbol
CLT3-4B CLT3 System electromagnetic compatibility ratings, RI = 1.8 k, RC = 4.7 k (unless otherwise specified)
Node Parameter name and conditions ESD protection, IEC 61000-4-2, per input, in air ESD protection, IEC 61000-4-2, per input, in contact Value 8 6 3 3 4 1 1 Unit kV kV kV kV kV kV kV
VPP
IN
ESD protection, IEC 61000-4-2, per input, in air, RI = 0 ESD protection, IEC 61000-4-2, per input, in contact, RI = 0
VPPB VPP VPP
VI VI VCC
Total Peak Pulse Voltage Burst, IEC 61000-4-4 CIN = 100 pF, COUT = 22 nF, F = 5 kHz (1) Peak Pulse Voltage Surge, IEC 61000-4-5, R = 42 (2) Peak Pulse Voltage Surge, IEC 61000-4-5, R = 2
(2)
1. Refer to Application note AN2527 for test conditions. 2. See test circuit in Figure 12.
Figure 3.
Typical junction to ambient thermal resistance versus copper surface under common pad (FR4 epoxy, copper thickness is 35 m)
Rth(j-a)( C/W) 160 140 120 100 80 60 40 20 0 0.0 0.5 1.0 1.5 2.0 S(cm) 2.5 3.0 3.5 4.0 4.5 5.0
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.
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CLT3-4B
Characteristics 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 VIN is higher than 5 V, or the module input voltage Vi higher than 11 V and a series resistor RI = 1.2 k, 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 optocoupler is on. Depending on the input type operation that is described by the IEC 61131-2 standard, the input resistance RI can be adjusted because of the different on-state threshold VON MIN. This document describes operation and characteristics for type 3 operation with VON MIN = 11 V and RI = 1.2 k. In type 1 operation the on state threshold VON MIN is 12.34 V instead, and the input resistor RI is set 2.2 k.
1.2
Input characteristics of CLT3-4
Figure 4. Typical input characteristics of each CLT3-4 channel
VIN(V) 30 30 25 3.7
20
15
10 5 5 Off-state On-state
0 0 0.5 1 1.5 2 IIN(mA) 2.5 3 3.5 4
5/13
Characteristics
CLT3-4B
Figure 5.
Typical current limiter variation versus junction temperature 0.9 V < VOUT < 2 V
Figure 6.
Typical limiter threshold voltage variation versus junction temperature for IIN = 2.1 mA
IIim / IIim (25 C)
102% 100% 98% 96% 94%
3.6
VTH (V)
VIN = 27 V
3.5
3.4
92% 90% 88% 86% 84% -25 0 25 50 75 100 125
VIN = 5 V
3.3
Tj (C)
3.2 -25 0 25
Tj ( C)
50 75 100 125
1.3
Figure 7.
IOUT (mA) 4
3.5 3
CLT3-4 Input / output transfer characteristics (with respect to common pin COM)
Current tranfer characteristic
ISOLATOR ON 3.7
Figure 8.
IOUT (mA) 4
Transconductance characteristic
Transition zone
ISOLATOR ON 3.5 3
Forbidden 2.5 2 1.5 1 0.5 0 0 0.5 1 1.5 0.04
2.1
2.5 2 1.5 1
Transition zone
0.5
2 2.5 3 3.5 4
0 0 5 10 15 VI (V) 20 25 30
ISOLATOR OFF
IIN (mA)
6/13
CLT3-4B
Application information
2
2.1
Application information
Application description
The CLT device is used between the input module and the opto-coupler of an I/O module. To secure the coupler off state and the non-conduction of its diode, the maximum CLT output current is 40 A with R opto = 15 k. When the CLT input voltage VIN is higher than 5 V, a minimum CLT output current of 1.5 mA will secure the opto-coupler on state. The CLT limiter is insensitive to the output voltage up to 2.0V. Therefore, its output is able to drive any state of the art opto-coupler. Some additional device can be added in series with the opto-coupler if the output voltage remains within its functional limits. A stand-alone sensor is normally connected on the CLT input. For a good off state control, its quiescent current has to be less than 1.5 mA (EN60947-5-2 standard compatible) keeping then the opto-coupler off thanks to the CLT device (IOUT < 40 A). And its maximum ON state voltage VS-ON will be lower than 8 V (EN60947-5-2 standard compatible) corresponding to the difference between the minimum supply voltage (VCC MIN = 19.2 V) and the maximum current limitation activation voltage: VCC MIN = VS-ON + VI VI = VIN + RI x IIN MAX (VI = 11 V when VIN = 5 V, RI = 1.2 k, IIN < 3.7 mA).
2.2
Input reverse polarity robustness
Each input of the CLT device may be biased to a reverse polarity. This case corresponds to a connection mistake or a reverse biasing that is generated by the demagnetization of a monitored inductive solenoid. The involved input can withstand the reverse current up to 20 mA (in the configuration shown in Figure 10) through its input protection diode while its opto-coupler remains OFF. Such a case is not critical for the CLT3-4 itself, as it represents less than 15 mW per disturbed input. But the input resistors should be designed with care regardless of their thermal characteristics (refer to Application note AN2527). When the reverse polarity operation is required in types 3 input mode, it is recommended to increase the input resistance RI to 1.8 k in order to reduce its dissipation and keep the input current below its maximum allowed level (20 mA). The surge and transient immunity robustness of the CLT3 is then also increased. A 1.8 k value allows the reverse input current to be reduced to 16.2 mA and the resistor dissipation to be reduced to 0.47 W, for 30 V VCC and a - 30 V VI voltages. The CLT3 normal operation in type 3 is fully compatible with this recommended resistance since its internal state threshold is monitored at VIN = 4.2 V and VC = 10V - corresponding to VI = 11 V and VCC = 19 V. In type 1 input operation where RI = 2.2 k the dissipation of this resistor is less than 0.39 W. The other inputs remain operational, as long as the power supply is working properly (VCC >19 V). Refer to Application note AN 2527 for representative application design case.
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Application information
CLT3-4B
The CLT3-4 and the 24 V bus power supply have the same ground COM = GND. The reverse polarity of the power supply will shutdown the device. And the power supply resistor RC will limit the default current protecting the power supply pin VC. Its dissipation will be less than 0.2 W. Then, the whole module supply voltage rating is extended to from 0 to 30 V to -30 to +30 V.
2.3
EMC considerations
Figure 9 gives a typical application diagram where output capacitors are used to increase CLT device immunity against fast transient bursts. Figure 11 gives the printed circuit board layout associated with this schematic. Refer to AN2527 for EMC considerations. Figure 9. Robust application diagram
1 COM VI VIN IN1 RI 24V SUPPLY VCC RC ESDC RI ESD12
COM OUT1 COM12 OUT2 COM COM OUT3 COM34 OUT4 COM
2 wires sensor
3 wires sensor
RI IN2 VC VC
Contact switch
IN3 ESD34 RI
2 wires sensor
IN4 COM
8/13
CLT3-4B
Application information Figure 10. Current sharing in the CLT device when IN4 is biased at - 30 V and the others at + 30 V, RI = 1.8 k
Vcc = + 30 V
0.8 mA
4.7 k
VC
INN I1 = + 30 V 3.7 mA 1.8 k
VCL= 38 V
IREG N OUT1
OPTO N GND (0 V) COM OPTO 4 1.8 k I2 = - V -30 16.2 mA IN4 IREG4 OUT2
CLT3 - 4
Figure 11. TSSOP20 printed circuit board example
COMMON PAD MODULE CONNECTOR
COM IN1 ESD12 IN2 VC ESDC IN3 ESD34 IN4 COM COOLING PAD
COM OUT1 COM12 OUT2 COM COM OUT3 COM34 OUT4 COM
GND
The input and supply pins are designed to withstand electromagnetic interferences. As shown on the device block diagram, each channel input is protected by a clamping diode that is connected to the common pin COM. Combined with a serial input resistance RI = 1.2 k, this clamping diode implements an effective protection against transient voltage burst ( 4 kV, IEC 61000-4-4) and voltage surge ( 1 kV, IEC 61000-4-5).
9/13
Application information
CLT3-4B
Depending on the input type operation the input resistance RI can be adjusted because of the different on-state threshold VON MIN. So the surge voltage is also increased from the minimum level of the type 3 to the type as shown in Table 6. Table 6.
Type 1 3
Setting the input resistor RI according to the input type operation
VON MIN (V) 15 11 RI (k) 2.2 1.2 to 1.8 VPP surge (kV) 2 1
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 RC = 4.7 k, the supply pin VC 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 VC voltage surge test circuit
VPPS = 1 kV with 2
VCC
RC VC
VPPI I VPPS VPP
RI IN1 RI RI IN2
VPPI = 1 kV with 42 VPPI GND
CLT3 -4
COMP 5 nF PE/FE
10/13
CLT3-4B
Package information
3
Package information
Epoxy meets UL94,V0
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Table 7. TSSOP20 dimensions
Dimensions Ref. Millimeters Min.
D E1
Inches Min. Typ. Max. 0.047 0.002 0.007 0.003 0.006 0.012 0.007 0.031 0.039 0.041
Typ.
Max. 1.2
A A1
C
A2 b aaa C A1
A
0.05 0.8 0.19 0.09 6.4 6.2 4.3 0.45 0 6.5 6.4 4.4 0.65 0.6 1.0 1.0
0.15 1.05 0.3 0.2 6.6 6.6 4.5 0.75 8 0.1
A2 b c
Figure 13. TSSOP20 footprint (dimensions in mm)
7.26 4.93 0.36
PIN 1 INDENTIFICATION
20
11
Seating plane C E
0.25 mm Gage plane
D E E1
k
0.252 0.256 0.259 0.244 0.252 0.256 0.169 0.173 0.177 0.026 0.017 0.023 0.029 0.039 0 8 0.004
L 1 e 10 L1
e L L1 k aaa
6.21 0.65
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Ordering information
CLT3-4B
4
Ordering information
Table 8. Ordering information
Marking CLT3-4B CLT3-4B Package TSSOP20 TSSOP20 Weight 0.074 g 0.074 g Base qty 74 2500 Delivery mode Tube Tape and reel
Order code CLT3-4BT6 CLT3-4BT6-TR
5
Revision history
Table 9.
Date August-2002
Document revision history
Revision 4A Previous release. Reformatted and restructured to current standard. Updated Figure 2, Figure 9, Figure 10, Figure 11, and deleted Figure 12. Added paragraphs to Functional description and Application information. Extended application field with a new diagram (Figure 11) for reverse polarity test. Updated Package information. Changes
27-Nov-2007
5
12/13
CLT3-4B
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