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

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.

TIDUEU7.PDF (988 K)

Reference design overview and verified performance test data

TIDM209.ZIP (1281 K)

Detailed schematic diagram for design layout and components

TIDM210.ZIP (376 K)

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

TIDM211.ZIP (1005 K)

Detailed overview of design layout for component placement

TIDM213.ZIP (6440 K)

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

TIDCFM8.ZIP (1179 K)

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

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

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Isolated amplifiers

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

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Isolated amplifiers

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

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Isolated amplifiers

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

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Isolated amplifiers

AMC13112-V input, reinforced isolated amplifier with high CMTI for voltage sensing

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Isolated amplifiers

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

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Isolated amplifiers

ISO124High-precision isolation amplifier

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Isolated amplifiers

ISO224Reinforced isolated amplifier for voltage sensing with ±12-V input

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AND gates

SN74LVC1G08Single 2-input, 1.65-V to 5.5-V AND gate

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Analog switches & muxes

CD74HC40515-V, 8:1, 1-channel analog mutliplexer

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Analog temperature sensors

TMP2351C analog temperature sensor, 10 mV/C

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Buck modules (integrated inductor)

LMZ14201SIMPLE SWITCHER® 6V to 42V, 1A Power Module in Leaded Surface Mount TO Package

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Buck modules (integrated inductor)

LMZ205012.7V to 5.5V, 1A High Density Nano Module

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Charge pumps (inductorless)

LM27762Low-Noise Positive- and Negative-Output Charge Pump With Integrated LDO

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Comparators

LM2903Dual differential comparator

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Comparators

LMV393Dual General Purpose Low-Voltage Comparator

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Comparators

TLV32025.5-V, high-speed, dual push-pull comparator

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Current sense amplifiers analog output

INA30136V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator

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Digital isolators

ISO7720Robust EMC, dual-channel, 2/0, reinforced digital isolator

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Digital isolators

ISO7721Robust EMC, dual-channel, 1/1, reinforced digital isolator

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Digital isolators

ISO7760Robust EMC, six-channel, 6/0, reinforced digital isolator

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Digital isolators

ISO7761Robust EMC, six-channel, 5/1, reinforced digital isolator

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Digital isolators

ISO7762Robust EMC, six-channel, 4/2, reinforced digital isolator

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ESD & surge protection ICs

TVS330033V flat-Clamp surge protection device

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General-purpose op amps

OPA2990Dual, 40-V, 1.1-MHz, low-power operational amplifier

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General-purpose op amps

TLV6001Single, 5.5-V, 1-MHz, RRIO operational amplifier

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General-purpose op amps

TLV9062Dual, 5.5-V, 10-MHz operational amplifier

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Hall-effect latches & switches

DRV5032Low power (5 Hz, <1µA), low voltage (up to 5.5V) switch

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Ideal diode/ORing controllers

LM74700-Q13.2-V to 65-V, 80-uA IQ automotive ideal diode controller

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Instrumentation amplifiers

INA333Low-Power, Zero-Drift, Precision Instrumentation Amplifier

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Instrumentation amplifiers

INA826Precision, 200-μA Supply Current, 36-V Supply Instrumentation Amplifier

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Inverting buffers & drivers

SN74LVC1G14Single 1.65-V to 5.5-V inverter with Schmitt-Trigger inputs

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Isolated DC/DC converters & modules

UCC12050500-mW, high-efficiency, 5-kVRMS isolated DC/DC converter

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LCD & OLED display power & drivers

TPS65131Split-Rail Converter with Dual, Positive and Negative Outputs (750mA typ)

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Linear & low-dropout (LDO) regulators

TLV1117LV1-A, low-dropout voltage regulator

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Linear & low-dropout (LDO) regulators

TLV704150-mA, 24-V, ultra-low-IQ, low-dropout voltage regulator

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Linear & low-dropout (LDO) regulators

TPS709150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

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Linear & low-dropout (LDO) regulators

TPS763150-mA, 10-V, low-dropout voltage regulator with enable

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Linear & low-dropout (LDO) regulators

TPS7A39150-mA, 33-V, low-noise, high-PSRR, dual-channel positive & negative low-dropout voltage regulator

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Load switches

TPS229445.5-V, 0.1-A, 500-mΩ, load switch with current limit and active high enable

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N-channel MOSFETs

CSD17571Q230-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 29 mOhm

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N-channel MOSFETs

CSD18534Q5A60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.8 mOhm

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Noninverting buffers & drivers

SN74LVC1G125Single 1.65-V to 5.5-V buffer with 3-state outputs

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Noninverting buffers & drivers

SN74LVC1G17Single 1.65-V to 5.5-V buffer with Schmitt-Trigger inputs

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Noninverting buffers & drivers

SN74LVC2G342-ch, 1.65-V to 5.5-V buffers

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OR gates

SN74LVC1G32Single 2-input, 1.65-V to 5.5-V OR gate

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Precision op amps (Vos<1mV)

OPA21800.1 uV/°C DRIFT, Low Noise, Rail-to-Rail Output, 36V Zero-Drift Op Amp

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Precision op amps (Vos<1mV)

OPA21880.03µV/°C, 6µV Vos, Low Noise, Rail-to-Rail Output, 36V Zero-Drift Operational Amplifier

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Series voltage references

REF34252.5-V, low-drift, low-power, small-footprint series voltage reference

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Series voltage references

REF34505-V, low-drift, low-power, small-footprint series voltage reference

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Supervisor & reset ICs

TPS3897Single-channel, ultra-small, adjustable supervisor with active-high, open-drain output

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Temperature switches

TMP300Resistor-Programmable, up to 18V-Capable Temp Switch and Analog Out Sensor

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Transformer drivers

SN6501Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

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Transformer drivers

SN6505ALow-noise, 1-A, 160-kHz transformer driver with soft start for isolated power supplies

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Transformer drivers

SN6505BLow-noise, 1-A, 420-kHz transformer driver with soft start for isolated power supplies

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eFuses & hot swap controllers

TPS26624.5-V to 60-V, 478mΩ, 0.025-0.88A eFuse with integrated input and output reverse polarity protection

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Technical documentation

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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

Related design resources

Hardware development

EVALUATION BOARD
ADS131A04EVM ADS131A04 evaluation module ADS131E08EVM-PDK ADS131E08 performance demonstration kit ADS131M04EVM ADS131M04 24-bit, 32-kSPS, 4-channel, simultaneous-sampling, delta-sigma ADC evaluation module ADS8588SEVM-PDK ADS8588S 16-Bit High-Speed 8-Ch Simultaneous-Sampling ADC EVM Performance Demonstration Kit (PDK) ADS8688EVM-PDK ADS8688 16-bit, 500-kSPS, 8-channel, single-supply, SAR ADC EVM performance demonstration kit (PDK)

Reference designs

REFERENCE DESIGN
TIDA-00227 Small Form Factor 12W Ultra Wide Range Power Supply for Protection Relays - Reference Design TIDA-010055 Non-isolated power architecture with diagnostics reference design for protection relay modules TIDA-01576 High accuracy analog input module reference design with 16-bit 1-MSPS dual simultaneous-sampling ADC

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