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PCLT-2A：Dual current limited overvoltage protected digital termination

The PCLT-2A is a dual input current limiter device designed for 24 V DC automation applications.

This product is compatible with the type 2 (7.5 mA) or type 3 (3 mA) characteristic of the IEC 61131-2 standard. An internal resistance R_REFallows the limiting current value to be adjusted from 3 to 7.5 mA.

Each input voltage clamping block protects the module input against electromagnetic interference such as those described in the IEC 61131-2 standard, IEC 61000-4-2 (ESD), 4-4 (transient burst), 4-5 (voltage surge) and 4-6 (conducted radio frequency interference) standards. The supply input is also designed with such a protection structure.

The low tolerance of the current limitation allows a drastic reduction in the dissipation of the input compared to a resistive input. The PCLT2 is packaged in TSSOP14 - a very low R_THexposed pad package that allows the PCB cooling pad to be reduced.

The output block of each termination channel transfers the input logic state to a logic output and a light emitting diode (LED).

Key Features

• 2 channel topology: low side input with common ground
• Wide range input DC voltage:
  • VI = - 0.3 to 30 V with RI = 0 Ω
  • VI = - 30 to 35 V with RI = 750 Ω
• Current limiter:
  • 3 to 7.5 mA programmable reference
  • ILIM = 6.1 mA to 8.8 mA with RREF = 10 kΩ
  • ILIM = 2.8 mA to 4.3 mA with RREF = 22 kΩ
  • Narrow limiter spread: < 17%
  • Temperature compensated operation
• Output drive:
  • No output activation below 2 mA input
  • 1.5 mA minimum output activating current in opto-coupler mode
  • Programmable CMOS output mode option (VMOD > 2.9 V)
• LED drive for sensor status: 4.4 mA typical with RREF = 10 kΩ
• Input protection (RI = 750 Ω CIN = 22 nF)
• IEC 61000-4-2 ESD, Level 4
  • In contact, ± 8 kV; in air, ± 15 kV
  • Criteria B: temporary disruption
• IEC 61000-4-5 voltage surge, Level 3
  • ± 500 V with 42 Ω series resistor in differential mode
  • Criteria B: temporary disruption
• IEC 61000-4-4 transient burst immunity
  • ± 4 kV peak voltage; 5 kHz repetitive rate
  • Criteria A: fully functional
• IEC 61000-4-6 conducted RFI
  • 10 VRMS
  • Criteria A: fully functional
• Input protection against -30 V reverse polarity
• Ambient temperature: -25 to 85 °C
• Benefits
  • Enable input to meet type1, 2 and 3 characteristics of IEC 61131-2 standard
  • Compatible operation with 2 and 3 wires proximity sensor according EN60947-5-2 standard
  • Flexible configuration driving either opto- coupler, or CMOS bus controller input, or 12 V AS-Interface network
  • Reduced overall dissipation
  • Enhanced functional reliability
  • Compact with high integration
  • Surface mount package for highly automated assembly
  • Insensitive to the on-state sensor impedance

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