SBASB13 December   2024 AMC0311S

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information (D Package)
    5. 6.5  Thermal Information (DWV Package)
    6. 6.6  Power Ratings 
    7. 6.7  Insulation Specifications (Basic Isolation)
    8. 6.8  Insulation Specifications (Reinforced Isolation)
    9. 6.9  Safety-Related Certifications (Basic Isolation)
    10. 6.10 Safety-Related Certifications (Reinforced Isolation)
    11. 6.11 Safety Limiting Values (D Package)
    12. 6.12 Safety Limiting Values (DWV Package)
    13. 6.13 Electrical Characteristics
    14. 6.14 Switching Characteristics
    15. 6.15 Timing Diagram
    16. 6.16 Insulation Characteristics Curves
    17. 6.17 Typical Characteristics
  8. 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 Reference Input
    5. 7.5 Device Functional Modes
  9. 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 Input Filter Design
        2. 8.2.2.2 Connecting the REFIN pin
      3. 8.2.3 Application Curve
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

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発注情報

8.2.2 Detailed Design Procedure

The 200μA cross-current requirement at the maximum DC-link voltage (450V) determines that the total impedance of the resistive divider is 2.25MΩ. The impedance of the resistive divider is dominated by the top portion (shown exemplary as R1 and R2 in Figure 8-1) and the voltage drop across RSNS can be neglected for a moment. The maximum allowed voltage drop per unit resistor is specified as 125V; therefore, the minimum number of unit resistors in the top portion of the resistive divider is 450V / 125V ≅ 4. The calculated unit value is 2.25MΩ / 4 = 563kΩ and the next closest value from the E96 series is 562kΩ. The sense resistor (RSNS) is sized such that the voltage drop across the resistor at the maximum DC-link voltage (450V) equals the linear full-scale range input voltage (VFSR) of the AMC0x11S, which is 2.25V. This resistance is calculated as RSNS = VFSR / (VDC-link, MAX – VFSR) × RTOP, where RTOP is the total value of the top resistor string (4 × 562kΩ = 2.248MΩ). RSNS is calculated as 11.3kΩ and matches a value from the E96 series.

Table 8-2 summarizes the design of the resistive divider.

Table 8-2 Resistor Value Examples
PARAMETER VALUE
Unit resistor value, RTOP 562kΩ
Number of unit resistors in RTOP 4
Sense resistor value, RSNS 11.3kΩ
Total resistance value (RTOP + RSNS) 2.251MΩ
Resulting current through resistive divider, ICROSS 199.2μA
Resulting full-scale voltage drop across sense resistor RSNS 2.251V
Peak power dissipated in RTOP unit resistor 22.3mW
Total peak power dissipated in resistive divider 89.6mW