描述 Description

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 RREFallows 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 RTHexposed 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).

特性 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

簡(jiǎn)介

PCLT-2A屬于電路保護(hù)的TVS-混合技術(shù)。由制造生產(chǎn)的PCLT-2ATVS - 混合技術(shù)混合技術(shù) TVS（瞬態(tài)電壓抑制器）產(chǎn)品族中的產(chǎn)品屬于過壓保護(hù)產(chǎn)品，其中結(jié)合了基于多種技術(shù)的保護(hù)機(jī)制，例如串聯(lián)連接的 MOV（金屬氧化物壓敏電阻）和 GDT（氣體放電管），旨在同時(shí)獲得低漏電流和自恢復(fù)箝位工作特性。