SBASAB3 October   2021 AMC1411-Q1

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 Typical Application

Reinforced isolated amplifiers are commonly offered in SOIC packages with less than 9 mm of clearance and creepage specification. Automotive systems supporting working voltages greater than 850 V, designed for altitudes greater than 2000 m or for environments with pollution degree 2 or higher, may require clearance and creepage distances greater than 9 mm. Examples are OBC, DC/DC converters, and traction inverters for 800-V automotive battery systems that support DC-bus voltages up to 1000 V.

The AMC1411-Q1 comes in a SOIC package with greater than 15.7 mm of creepage distance and is specifically designed for use in high-voltage systems that require accurate voltage monitoring and reinforced isolation between high-voltage and low-voltage parts of the system.

Figure 8-1 shows an OBC that uses the AMC1411-Q1 to monitor the DC-bus voltage that can be as high as 1000 V. The DC-bus voltage is divided down to an approximate 2-V level across the bottom resistor (RSNS) of a high-impedance resistive divider that is sensed by the AMC1411-Q1. The output of the AMC1411-Q1 is a differential analog output voltage of the same value as the input voltage but is galvanically isolated from the high-side by a reinforced isolation barrier.

The wide creepage and clearance, high isolation voltage rating, and high common-mode transient immunity (CMTI) of the AMC1411-Q1 ensure reliable and accurate operation in harsh and high-noise environments.

Figure 8-1 Using the AMC1411-Q1 for DC Bus Voltage Sensing in an OBC