TIDA-010065

High-efficiency, low-emission, isolated DC/DC converter-based analog input module reference design

TIDA-010065

Design files

Overview

This reference design is a simplified architecture for generating an isolated power supply for isolated amplifiers for measuring isolated voltages and currents. A fully integrated DC/DC converter with reinforced isolation operating from a 5-V input with configurable 5-V or 5.4-V output (headroom for low dropout regulator (LDO)) generates the isolated power. Shunts that are interfaced to ±50-mV input range isolation amplifiers configured as channel isolated inputs measure the current. Potential divider output interfaced to ±250-mV or ±12-V input range isolation amplifiers configured as group isolated inputs measure the voltage. The outputs of the isolation amplifiers interface directly to 24-bit delta sigma analog-to-digital converter (ADC) or are scaled to ±10 V using gain amplifiers and interfaced to 16-bit SAR ADC for performance evaluation. On-board digital diagnostics improves reliability and enhances system performance.

Features

Generation of high efficiency isolated supply of 5 or 5.4V (LDO head room) from 4.5 to 5.5 V input providing reinforced isolation
Measures three group isolated voltage inputs with a range of 3-350V providing pin compatible basic or reinforced isolation and three isolated current inputs from 40mA-12.5A providing reinforced isolation
ISO224 with input range of ±12V input range connects directly to low power current transformer output as per IEC 60044-8
Measurement of DC voltage and current with 1us fast fault detection comparator path
Gain scaling of isolation amplifier output to ADS8588H input range of ±10V using instrumentation, precision or general purpose amplifiers
Achieves ±0.2% accuracy for both voltage and current using 16-bit SAR or 24-bit delta-sigma ADC

Industrial

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

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Design guide — TIDA-010065

TIDUEU7.PDF (988 K)

Reference design overview and verified performance test data

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Schematic — TIDA-010065

TIDM209.ZIP (1281 K)

Detailed schematic diagram for design layout and components

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Bill of materials (BOM) — TIDA-010065

TIDM210.ZIP (376 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

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Assembly drawing — TIDA-010065

TIDM211.ZIP (1005 K)

Detailed overview of design layout for component placement

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CAD/CAE symbol — TIDA-010065

TIDM213.ZIP (6440 K)

Files used for 3D models or 2D drawings of IC components

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Gerber file — TIDA-010065

TIDCFM8.ZIP (1179 K)

Design file that contains information on physical board layer of design PCB

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PCB layout — TIDA-010065

TIDM212.ZIP (3172 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Isolated amplifiers

AMC1100 — ±250 mV-Input, Low-Cost Basic Isolated Amplifier for Current Sensing

Data sheet

	Type	Title	Date
*	Design guide	High-Efficiency, Low-Emissions, Isolated DC/DC Converter Based Analog Input	Sep. 25, 2019
	White paper	High-Voltage Semiconductor Solutions for Meeting Isolation Requirements	Jan. 20, 2021

TIDA-010065

High-efficiency, low-emission, isolated DC/DC converter-based analog input module reference design

TIDA-010065

Overview

Features

Industrial

Design files & products

Design files

Products

AMC1100 — ±250 mV-Input, Low-Cost Basic Isolated Amplifier for Current Sensing

AMC1200 — ±250-mV-input basic isolated amplifier for current sensing

AMC1300 — ±250-mV input, reinforced isolated amplifier with high CMTI for current sensing

AMC1302 — ±50-mV-input, high-precision, reinforced isolated amplifier for current sensing

AMC1311 — 2-V input, reinforced isolated amplifier with high CMTI for voltage sensing

AMC3301 — ±250-mV input, precision reinforced isolated amplifier with integrated DC/DC converter

ISO124 — High-precision isolation amplifier

ISO224 — Reinforced isolated amplifier for voltage sensing with ±12-V input

SN74LVC1G08 — Single 2-input, 1.65-V to 5.5-V AND gate

CD74HC4051 — 5-V, 8:1, 1-channel analog mutliplexer

TMP235 — 1C analog temperature sensor, 10 mV/C

LMZ14201 — SIMPLE SWITCHER® 6V to 42V, 1A Power Module in Leaded Surface Mount TO Package

LMZ20501 — 2.7V to 5.5V, 1A High Density Nano Module

LM27762 — Low-Noise Positive- and Negative-Output Charge Pump With Integrated LDO

LM2903 — Dual differential comparator

LMV393 — Dual General Purpose Low-Voltage Comparator

TLV3202 — 5.5-V, high-speed, dual push-pull comparator

INA301 — 36V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator

ISO7720 — Robust EMC, dual-channel, 2/0, reinforced digital isolator

ISO7721 — Robust EMC, dual-channel, 1/1, reinforced digital isolator

ISO7760 — Robust EMC, six-channel, 6/0, reinforced digital isolator

ISO7761 — Robust EMC, six-channel, 5/1, reinforced digital isolator

ISO7762 — Robust EMC, six-channel, 4/2, reinforced digital isolator

TVS3300 — 33V flat-Clamp surge protection device

OPA2990 — Dual, 40-V, 1.1-MHz, low-power operational amplifier

TLV6001 — Single, 5.5-V, 1-MHz, RRIO operational amplifier

TLV9062 — Dual, 5.5-V, 10-MHz operational amplifier

DRV5032 — Low power (5 Hz, <1µA), low voltage (up to 5.5V) switch

LM74700-Q1 — 3.2-V to 65-V, 80-uA IQ automotive ideal diode controller

INA333 — Low-Power, Zero-Drift, Precision Instrumentation Amplifier

INA826 — Precision, 200-μA Supply Current, 36-V Supply Instrumentation Amplifier

SN74LVC1G14 — Single 1.65-V to 5.5-V inverter with Schmitt-Trigger inputs

UCC12050 — 500-mW, high-efficiency, 5-kVRMS isolated DC/DC converter

TPS65131 — Split-Rail Converter with Dual, Positive and Negative Outputs (750mA typ)

TLV1117LV — 1-A, low-dropout voltage regulator

TLV704 — 150-mA, 24-V, ultra-low-IQ, low-dropout voltage regulator

TPS709 — 150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

TPS763 — 150-mA, 10-V, low-dropout voltage regulator with enable

TPS7A39 — 150-mA, 33-V, low-noise, high-PSRR, dual-channel positive & negative low-dropout voltage regulator

TPS22944 — 5.5-V, 0.1-A, 500-mΩ, load switch with current limit and active high enable

CSD17571Q2 — 30-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 29 mOhm

CSD18534Q5A — 60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.8 mOhm

SN74LVC1G125 — Single 1.65-V to 5.5-V buffer with 3-state outputs

SN74LVC1G17 — Single 1.65-V to 5.5-V buffer with Schmitt-Trigger inputs

SN74LVC2G34 — 2-ch, 1.65-V to 5.5-V buffers

SN74LVC1G32 — Single 2-input, 1.65-V to 5.5-V OR gate

OPA2180 — 0.1 uV/°C DRIFT, Low Noise, Rail-to-Rail Output, 36V Zero-Drift Op Amp

OPA2188 — 0.03µV/°C, 6µV Vos, Low Noise, Rail-to-Rail Output, 36V Zero-Drift Operational Amplifier

REF3425 — 2.5-V, low-drift, low-power, small-footprint series voltage reference

REF3450 — 5-V, low-drift, low-power, small-footprint series voltage reference

TPS3897 — Single-channel, ultra-small, adjustable supervisor with active-high, open-drain output

TMP300 — Resistor-Programmable, up to 18V-Capable Temp Switch and Analog Out Sensor

SN6501 — Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

SN6505A — Low-noise, 1-A, 160-kHz transformer driver with soft start for isolated power supplies

SN6505B — Low-noise, 1-A, 420-kHz transformer driver with soft start for isolated power supplies

TPS2662 — 4.5-V to 60-V, 478mΩ, 0.025-0.88A eFuse with integrated input and output reverse polarity protection

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