SBASAZ0 August   2024 AMC0136

ADVANCE INFORMATION  

  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 (DEN Package)
    5. 5.5 Package Characteristics
    6. 5.6 Electrical Characteristics
    7. 5.7 Switching Characteristics
    8. 5.8 Timing Diagram
  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 Modulator
      3. 6.3.3 Isolation Channel Signal Transmission
      4. 6.3.4 Digital Output
        1. 6.3.4.1 Output Behavior in Case of a Full-Scale Input
        2. 6.3.4.2 Output Behavior in Case of a Missing High-Side Supply
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
      3. 7.2.3 Input Filter Design
      4. 7.2.4 Bitstream Filtering
    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 Detailed Design Procedure

The 100μA cross-current requirement at the maximum system voltage (60V) determines that the total impedance of the resistive divider is 600kΩ. The impedance of the resistive divider is dominated by R1, thus neglecting the voltage drop across R2 for a moment is acceptable. The closest value to 600kΩ from the E96 series is 604kΩ. This value is for R1.

The linear full-scale input voltage (VFSR) of the AMC0136 is 1V. R2 is sized to produce a 1V drop at the maximum system voltage of 60V. R2 is calculated as R2 = VFSR / (VDC-link, max – VFSR) × R1. The resulting value is 10.24kΩ and the closest value from the E96 series is 10.2kΩ.

Table 7-2 summarizes the design parameters for this application.

Table 7-2 Design Summary
PARAMETER VALUE
R1 resistor 604kΩ
Sense resistor value (RSNS) 10.2kΩ
Resulting current through resistive divider (ICROSS at 60V) 97.7μA
Resulting full-scale voltage drop across sense resistor (RSNS) 996mV
Total power dissipated in resistive divider 5.9mW