SBOS872A May   2018  – June 2018 OPA521

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      OPA521 Block Diagram
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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 Electrical Characteristics
    6. 6.6 Electrical Characteristics: Digital
    7. 6.7 Electrical Characteristics: Power Supply
    8. 6.8 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 IQSET Pin
      2. 7.3.2 EN Pin
      3. 7.3.3 ILIM Pin Current Limiting
      4. 7.3.4 IFLAG and TFLAG Pins
    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 Interfacing the OPA521 to the AC Mains
          1. 8.2.2.1.1 Low-Voltage Capacitor
          2. 8.2.2.1.2 High-Voltage Capacitor
          3. 8.2.2.1.3 Inductor
          4. 8.2.2.1.4 Line Coupling Transformer
        2. 8.2.2.2 Circuit Protection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Thermal Considerations
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

8.2 Typical Application

The impedance of the mains network at these signaling frequencies is relatively low (< 1 Ω to 30 Ω). This circuit has been designed to drive a 2-Ω mains line over the 40-kHz-to-90-kHz bandwidth. The signaling impedance of the mains network fluctuates as different loads are switched on during the day or over a season and it is influenced by many factors such as:

  • Localized loading from appliances connected to the mains supply near to the connection of the communication equipment; for example, heavy loads such as cookers and immersion heaters and reactive loads such as EMC filters and power factor corrections.
  • Distributed loading from consumers connected to the same mains cable, where their collective loading reduces the mains signaling impedance during times of peak electricity consumption; for example, meal times.
  • Network parameters; for example, transmission properties of cables and the impedance characteristics of distribution transformers and other system elements.

With such a diversity of factors, the signaling environment fluctuates enormously, irregularly, and can differ greatly from one installation to another. Design the signaling system for reliable communications over a wide range of mains impedances and signaling conditions. Consequently, the transmitter must be able to drive sufficient signal into the mains network under these loading conditions.

The OPA521 amplifier has 1.9-A output drive capability with short-circuit protection; hence, it adequately copes with the high current demands required for implementing mains signaling systems.

OPA521 fbd-01-sbos872.gifFigure 20. OPA521 Interface to the AC Mains