SLVSFE3B November 2020 – May 2021 TPS2661
The TPS2661x is a family of devices providing complete protection for current inputs, voltage inputs/outputs and sensor supply in industrial and process automation systems. The device supports both unipolar 4 - 20-mA current loops and bipolar ±20-mA current loops. TPS26610 is tailored for current inputs. The device can be powered from an external supply and draws < 100-nA maximum current from the current loop enabling design of high accuracy analog input systems. The devices feature an accurate 32 mA current limit which enables using low power components in the loop like the sense resistors which reduces the overall system size and cost. TPS26611 is specifically tailored for universal current inputs, voltage/current multiplexed inputs while TPS26612 is tailored for protection of two wire sensor transmitters. TPS2661x devices feature a configurable MODE pin to allow higher current for powering up of a variety of two wire transmitters. TPS26611 also has enable control for designing V/I multiplexed analog inputs or universal Analog Input-Output modules. The device also features a Signal Good output to indicate if the there is a valid current input. The signal good pin goes high in the event of any fault or during startup of the system if there is an inrush current. The device also protects the system from Output miswiring in Analog Output modules or sensor transmitters by cutting off the current path if the OUT pin goes outside the +/-Vs supply rails.
The robust protection of the TPS2661x along with its ±50-V rating helps to simplify the system designs for the surge compliance. TPS2661x devices are immune to noise tests like Electrical Fast Transients that are common in industrial applications and these devices also simplify the system design for protection from surge transients (IEC61000-4-5).