SBASAX1 August   2024 AMC0106M25

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 Diagrams
  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
        1. 7.2.2.1 Shunt Resistor Sizing
        2. 7.2.2.2 Input Filter Design
        3. 7.2.2.3 Bitstream Filtering
        4. 7.2.2.4 Designing the Bootstrap Supply
    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

7.2 Typical Application

Figure 7-1 shows a simplified schematic of a full-bridge motor drive that uses an AMC0106M25 to sense the motor current. The current flowing through an external shunt resistor RSHUNT produces a voltage drop that is sensed by the AMC0106M25. The AMC0106M25 digitizes the analog input signal on the high-side and transfers the data across the isolation barrier to the low-side. The device then outputs the digital bitstream on the DOUT pin that is synchronized to the clock applied to the CLKIN pin. The digital bitstream is processed by a low-pass digital filter in a micro control unit (MCU) or FPGA.

The 48V DC link voltage in this application is sensed by an AMC0136 isolated modulator.

AMC0106M25 Using the AMC0106M25 for Current Sensing in a Full-Bridge 48V Motor Driver Design Figure 7-1 Using the AMC0106M25 for Current Sensing in a Full-Bridge 48V Motor Driver Design

The high-side power supply (AVDD) is generated from a bootstrap circuit (R4, D1, C2). The low-side supply is shared with circuitry in the signal domain. Use the optional 49.9Ω resistor on the DOUT pin for line-termination to improve signal integrity on the receiving end.

The galvanic isolation barrier and high common-mode transient immunity (CMTI) of the AMC0106M25 provide reliable and accurate operation even in high-noise environments.