SBASAA7A May   2021  – September 2021 AMC1411

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Power Ratings
    6. 6.6  Insulation Specifications
    7. 6.7  Safety-Related Certifications
    8. 6.8  Safety Limiting Values
    9. 6.9  Electrical Characteristics
    10. 6.10 Switching Characteristics
    11. 6.11 Timing Diagram
    12. 6.12 Insulation Characteristics Curves
    13. 6.13 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Input
      2. 7.3.2 Isolation Channel Signal Transmission
      3. 7.3.3 Analog Output
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Insulation Coordination
        2. 8.2.2.2 Input Filter Design
        3. 8.2.2.3 Differential-to-Single-Ended Output Conversion
      3. 8.2.3 Application Curve
    3. 8.3 What To Do and What Not To Do
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

8.2.2.1 Insulation Coordination

In this example of a motor drive application, isolation between the high-voltage and low-voltage parts of the system must be checked against the requirements of the IEC61800-5-1 standard for electrical power drive systems. Isolation must be designed to withstand the rated impulse voltage, temporary overvoltage, and the working voltage. In addition, the physical distance between exposed metal parts on the high- and low-voltage side must meet the minimum creepage and clearance requirements.

Table B.1 of the IEC60664-1 standard defines the impulse voltage for a 690-V, 3-phase, unearthed system (such as an IT system, OVC III) as 8000 V. This value matches the VIOSM (8000 VPK) rating of the AMC1411.

Table B.1 of the IEC60664-1 standard also defines the system voltage of a 690-V, 3-phase IT system as 1000 V. According to table 7 of the IEC61800-5-1 standard, the temporary overvoltage for a system voltage of 1000 V is 3110 VPK, which is lower than the VIOTM (10500 V) of the AMC1411.

The working voltage in this example is 1200 VDC and is also lower than VIOWM (2260 VDC) of the AMC1411.

The minimum clearance for a 8000-V impulse voltage according the IEC61800-5-1, table 9, is 14 mm for reinforced isolation. The AMC1411 provides a minimum clearance of 14.7 mm and meets the requirement.

Finally, the minimum creepage distance for a working voltage of 1200 VDC, insulating material group I, pollution degree 2, reinforced isolation is 2 × 6.04 mm = 12.08 mm according to IEC61800-5-1 table 10. 6.04 mm is the interpolated value between the 1000 VRMS and 1250 VRMS and is doubled for reinforced isolation. The AMC1411 provides a minimum creepage of 15.7 mm and provides significant margin against the minimum requirement.