SBAS945B February   2022  – December 2024 AMC23C14

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 (Reinforced 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 Outputs
      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 and Short-Circuit Current Detection
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
      2. 7.2.2 Overvoltage and Undervoltage 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

Package Options

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

7.2.1 Overcurrent and Short-Circuit Current Detection

Fast overcurrent and short-circuit current detection is a common requirement in DC/DC converter and motor-control applications, and can be implemented with an AMC23C14 isolated window comparator as shown in Figure 7-1.

AMC23C14 Using the AMC23C14 for Overcurrent and Short-Circuit Detection Figure 7-1 Using the AMC23C14 for Overcurrent and Short-Circuit Detection

The load current flowing through an external shunt resistor RSHUNT produces a voltage drop that is sensed by the AMC1300B for control purposes. The same voltage is monitored by the AMC23C14 that is connected in parallel to the current-sensing amplifier and provides a fast sensing path for positive and negative fault-current detection. The trip threshold for overcurrent detection is set by the external resistor R1. The trip threshold for short-circuit detection is fixed by the internal 300-mV reference. Overcurrent conditions are signaled on OUT1, and short-circuit conditions are signaled on OUT2.

As depicted in Figure 7-1, the integrated low-dropout (LDO) regulator on the high-side allows direct connection of the VDD1 input to a commonly used floating gate-driver supply. Alternatively, the AMC23C14 can share a regulated supply with the AMC1300B . In that case, the VDD1 pin of the AMC23C14 connects directly to the VDD1 pin of the AMC1300B and R4 is not needed. The fast response time and high common-mode transient immunity (CMTI) of the AMC23C14 provide reliable and accurate operation even in high-noise environments.