ISO224主要特性以及應(yīng)用電路

TI公司的ISO224是增強(qiáng)隔離放大器，輸入和輸出采用隔離層進(jìn)行隔離，電流隔離高達(dá)5 kVRMS，單端輸入±12 V，差分輸出±4V，具有極好長壽命和低功耗，工作溫度–40℃到 +125℃，主要用在電網(wǎng)自動化，保護(hù)繼電器，工廠自動化和控制，軌道交通，馬達(dá)驅(qū)動以及功率分析器。本文介紹了ISO224主要特性，框圖，應(yīng)用電路以及評估模塊ISO224EVM主要特性，電路圖，材料清單和PCB絲印圖。

The ISO224 is a precision isolated amplifier with anoutput separated from the input circuitry by anisolation barrier with high immunity to magneticinterference. This barrier is certified to providereinforced galvanic isolation of up to 5 kVRMS with anexceptionally long lifetime and low power dissipation.

When used with isolated power supplies， this deviceseparates parts of the system that operate ondifferent common-mode voltage levels and protectslower-voltage devices from damage.

The input of the ISO224 is optimized for accuratesensing of ±10-V signals that are widely used inindustrial applications. The device operates of asingle supply on the high-side. This unique featuresimplifies the design of the isolated power supply andreduces the system cost. The integrated high-sidesupply voltage detection feature simplifies system level diagnostics. The ±4-V output of the ISO224allows lower-cost analog-to-digital converters （ADCs）to be used. The differential structure of the outputsupports high immunity to noise.

The ISO224 is fully specified over the extendedindustrial temperature range of –40℃ to +125℃ andis available in a wide-body 8-pin SOIC （DWV）package.

ISO224主要特性：

? Offered in High-Grade （ISO224B） and Low-Grade（ISO224A） Versions

? ±12-V Input Voltage Range Optimized for IsolatedVoltage Measurement in Industrial Applications

? Overvoltage Input Clamp With 9-kV ESD

? ±4-V Differential Output Voltage Range WithCommon-Mode at VDD2/2

? Low DC-Error Operation （ISO224B）：

– Input Offset： ±5 mV at 25℃， ±42 μV/??C max

– Gain Error： ±0.3% at 25℃， ±50 ppm/℃ max

– Nonlinearity： ±0.01% max， ±1 ppm/℃

? 4.5-V to 18-V Single-Supply on High-Side

? 4.5-V to 5.5-V Operation on Low-Side

? Safety-Related Certifications：

– 7071-VPEAK Reinforced Isolation per DIN VDEV 0884-11： 2017-01

– 5000-VRMS Isolation for 1 Minute per UL1577

? High CMTI： 140 kV/μs （typ），75 kV/μs （min）

ISO224應(yīng)用：

? Isolated Signal Acquisition in：

– Grid Automation

– Protection Relays

– Factory Automation and Control

– Rail Transport

– Motor Drives

– Power Analyzers

圖1.ISO224框圖

圖2.ISO224簡化電路圖

圖3.ISO224用于AC電壓檢測電路圖

圖4.基于SN6501的高邊電源電路

評估模塊ISO224EVM

This user’s guide describes the characteristics， operation， and use of the ISO224EVM. This evaluationmodule （EVM） is an evaluation and development kit for evaluating the ISO224 precision isolation amplifier.

A complete circuit description as well as schematic diagram and bill of materials are included.

The ISO224 is a precision isolation amplifier with an output separated from the input circuitry by a silicondioxide （SiO2） barrier that is highly resistant to magnetic interference. This barrier has been certified toprovide basic galvanic isolation of up to 7000 VPEAK according to UL1577 and IEC60747-5-2 specifications.

The input of the ISO224 is optimized for accurate sensing of ±10 V signals that are widely used inindustrial applications. The ISO224 operates on a single 5 V power supply on the high-side whichdramatically simplifies the design of the isolated power supply which reduces overall system costs.

Throughout this document， the abbreviation EVM and the term evaluation module are synonymous withthe ISO224EVM.

評估模塊ISO224EVM主要特性：

? Full-featured evaluation board for the ISO224 single-channel precision isolation amplifier

? Screw terminals for easy access to analog inputs and outputs

? Transformer and rectifiers to provide isolated power to VDD1 from VDD2

? Differential to Single-ended output options

圖5.評估模塊ISO224EVM外形圖

ISO224EVM ISO224 Reinforced Isolated Amplifier With Single-Ended ±12V Input and ±4V Differential Output Evaluation Board Image

圖6.評估模塊ISO224EVM電路圖

評估模塊ISO224EVM材料清單：

圖7.評估模塊ISO224EVM PCB絲印圖