TPS26613 datasheet(13/45 Pages) TI

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8 Detailed Description

8.1 Overview

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-mA to 20-mA

current loops and bipolar ±20-mA current loops. The TPS26610 and TPS26613 are 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. The TPS26611 and TPS26614 are specifically tailored for universal current inputs and

voltage/current multiplexed inputs while the TPS26612 is tailored for protection of two wire sensor transmitters.

The TPS2661x devices feature a configurable MODE pin to allow higher current for powering up of a variety

of two wire transmitters. The 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 start-up 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 surge

compliance. The TPS2661x devices are immune to noise tests like electrical fast transients that are common

in industrial applications. These devices also simplify the system design for protection from surge transients

(IEC61000-4-5).

8.2 Functional Block Diagram

MODE

IOL

Timer

Selection

IOL

Threshold

Selection

’

tOL_Expiry

tOL_Pulse_Expiry

tOL_Extend

2 x IOL

IOL

Pass FET Drive

and Control

OUT

+ve IOUT

IOUT

Sense

Ifast-trip

Fast-

trip

IOL

Limiter

-ve IOUT

Input

VO/I_UVLO

-Vs

VO/I_UVLO

Output

VOUT_OVLO

V(SNSR)

V(SNSF)

VSNS

Supply

Sensing

SGOOD

SG_Deglitch

RSGOOD

GND

TPS26610

Figure 8-1. Functional Block Diagram for TPS26610

www.ti.com

TPS2661

SLVSFE3C – NOVEMBER 2020 – REVISED DECEMBER 2021

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