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 5.4 V (LDO headroom) from 4.5-V to 5.5-V input providing reinforced isolation
  • Measures three group isolated voltage inputs with a range of 3 V to 350 V providing pin compatible basic or reinforced isolation and three isolated current inputs from 40 mA to 12.5 A providing reinforced isolation
  • ISO224 with input range of ±12-V input range connects directly to low-power current transformer output as per IEC 60044-8
  • Measurement of DC voltage and current with 1-µs fast fault detection comparator path
  • Gain scaling of isolation amplifier output to ADS8588H input range of ±10 V 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
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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, precision current sensing low-cost basic isolated amplifier

Data sheet: PDF | HTML
Isolated amplifiers

AMC1200±250-mV input, precision current sensing basic isolated amplifier

Data sheet: PDF | HTML
Isolated amplifiers

AMC1300±250-mV input, precision current sensing reinforced isolated amplifier

Data sheet: PDF | HTML
Isolated amplifiers

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

Data sheet: PDF
Isolated amplifiers

AMC13112-V input, precision voltage sensing reinforced isolated amplifier

Data sheet: PDF | HTML
Isolated amplifiers

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

Data sheet: PDF | HTML
Isolated amplifiers

ISO124±10-V input, precision voltage sensing low-cost isolated amplifier

Data sheet: PDF | HTML
Isolated amplifiers

ISO224±12-V input, precision voltage sensing reinforced isolated amplifier

Data sheet: PDF | HTML
AND gates

SN74LVC1G081-ch, 2-input 1.65-V to 5.5-V 32 mA drive strength AND gate

Data sheet: PDF
Analog current-sense amplifiers

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

Data sheet: PDF | HTML
Analog switches & muxes

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

Data sheet: PDF | HTML
Analog temperature sensors

TMP2351C analog temperature sensor, 10 mV/C

Data sheet: PDF | HTML
Buck modules (integrated inductor)

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

Data sheet: PDF | HTML
Buck modules (integrated inductor)

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

Data sheet: PDF | HTML
Charge pumps (inductorless)

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

Data sheet: PDF | HTML
Comparators

LM2903Dual differential comparator

Data sheet: PDF | HTML
Comparators

LMV393Dual General Purpose Low-Voltage Comparator

Data sheet: PDF | HTML
Comparators

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

Data sheet: PDF | HTML
Digital isolators

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

Data sheet: PDF | HTML
Digital isolators

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

Data sheet: PDF | HTML
Digital isolators

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

Data sheet: PDF | HTML
Digital isolators

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

Data sheet: PDF | HTML
Digital isolators

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

Data sheet: PDF | HTML
General-purpose op amps

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

Data sheet: PDF | HTML
General-purpose op amps

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

Data sheet: PDF | HTML
General-purpose op amps

TLV9062Dual, 5.5-V, 10-MHz operational amplifier

Data sheet: PDF | HTML
Hall-effect latches & switches

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

Data sheet: PDF | HTML
Ideal diode/ORing controllers

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

Data sheet: PDF | HTML
Instrumentation amplifiers

INA333Low-Power, Zero-Drift, Precision Instrumentation Amplifier

Data sheet: PDF | HTML
Instrumentation amplifiers

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

Data sheet: PDF | HTML
Inverting buffers & drivers

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

Data sheet: PDF | HTML
Isolated DC/DC converters & modules

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

Data sheet: PDF | HTML
LCD & OLED display power & drivers

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

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TLV1117LV1-A, low-dropout voltage regulator

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TLV704150-mA 24-V ultra-low-IQ low-dropout (LDO) voltage regulator

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

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

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

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

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

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

Data sheet: PDF | HTML
Load switches

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

Data sheet: PDF | HTML
N-channel MOSFETs

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

Data sheet: PDF | HTML
N-channel MOSFETs

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

Data sheet: PDF | HTML
Noninverting buffers & drivers

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

Data sheet: PDF | HTML
Noninverting buffers & drivers

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

Data sheet: PDF | HTML
Noninverting buffers & drivers

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

Data sheet: PDF | HTML
OR gates

SN74LVC1G321-ch, 2-input 1.65-V to 5.5-V 32-mA drive strength OR gate

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

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

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

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

Data sheet: PDF | HTML
Series voltage references

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

Data sheet: PDF | HTML
Series voltage references

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

Data sheet: PDF | HTML
Supervisor & reset ICs

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

Data sheet: PDF | HTML
TVS diodes

TVS330033V flat-clamp surge protection device

Data sheet: PDF | HTML
Temperature switches

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

Data sheet: PDF | HTML
Transformer drivers

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

Data sheet: PDF | HTML
Transformer drivers

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

Data sheet: PDF | HTML
Transformer drivers

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

Data sheet: PDF | HTML
eFuses & hot swap controllers

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

Data sheet: PDF | HTML

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 以可靠且經濟實惠的隔離技術解決高電壓設計挑戰 (Rev. C) PDF | HTML Feb. 15, 2024
White paper Addressing High-Volt Design Challenges w/ Reliable and Affordable Isolation Tech (Rev. C) PDF | HTML Sep. 26, 2023
White paper 높은 신뢰도와 합리적인 가격대의 절연 기술 개발과 관련한 고전압 설계 문제의 해결 (Rev. B) PDF | HTML Sep. 19, 2023

Related design resources

Hardware development

EVALUATION BOARD
ADS131A04EVM ADS131A04 evaluation module ADS131E08EVM-PDK ADS131E08 performance demonstration kit ADS131M04EVM Automotive, four-channel, 24-bit, 64-kSPS, simultaneous-sampling, delta-sigma ADC 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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