SBASAJ8B June   2022  – December 2024 AMC22C12

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information 
    5. 5.5  Power Ratings
    6. 5.6  Insulation Specifications (Basic Isolation)
    7. 5.7  Safety-Related Certifications 
    8. 5.8  Safety Limiting Values 
    9. 5.9  Electrical Characteristics
    10. 5.10 Switching Characteristics 
    11. 5.11 Timing Diagrams
    12. 5.12 Insulation Characteristics Curves
    13. 5.13 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Analog Input
      2. 6.3.2 Reference Input
      3. 6.3.3 Isolation Channel Signal Transmission
      4. 6.3.4 Open-Drain Digital Output
        1. 6.3.4.1 Transparent Output Mode
        2. 6.3.4.2 Latch Output Mode
      5. 6.3.5 Power-Up and Power-Down Behavior
      6. 6.3.6 VDD1 Brownout and Power-Loss Behavior
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Overcurrent Detection
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
      2. 7.2.2 Overvoltage Detection
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
      3. 7.2.3 Application Curves
    3. 7.3 Best Design Practices
    4. 7.4 Power Supply Recommendations
    5. 7.5 Layout
      1. 7.5.1 Layout Guidelines
      2. 7.5.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 Mechanical Data

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.2.2 Overvoltage Detection

Industrial motor drive systems commonly deploy an active or passive rectifier stage to generate a high-voltage, DC link potential from a single- or three-phase AC line input. The DC link voltage is sensed by an isolated amplifier such as the AMC1311B for control purposes. Power stages connected to the DC link rail can be sensitive to overvoltage conditions that can occur (for example, during a braking operation). The isolated amplifier is not always able to alert the system controller fast enough to take appropriate action to reduce the DC link voltage (for example, by turning on the break resistor) in case of an overvoltage condition. Therefore, a fast, isolated comparator is required to detect overvoltage conditions.

Figure 7-2 shows an active rectifier stage where the DC link voltage is sensed by an AMC1311B isolated amplifier. The AMC22C12 is connected parallel to the AMC1311B and monitors the voltage across RSNS for overvoltage conditions. The overvoltage trip-threshold is set by the R1 resistor connected to the REF pin of the AMC22C12. The open-drain OUT pin of the AMC22C12 is connected to a GPIO or interrupt pin of the MCU and is actively pulled low whenever the input voltage (VIN) exceeds the reference voltage (VREF).

AMC22C12 Using the AMC22C12 for Overvoltage Detection Figure 7-2 Using the AMC22C12 for Overvoltage Detection