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  • AMC23C12 Fast Response, Reinforced Isolated Window Comparator With Adjustable Threshold and Latch Function

    • SBASAB2B February   2022  – December 2024 AMC23C12

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  • AMC23C12 Fast Response, Reinforced Isolated Window Comparator With Adjustable Threshold and Latch Function
  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 Output
        1. 6.3.4.1 Transparent Output Mode
        2. 6.3.4.2 Latch Output Mode
      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 Detection
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
      2. 7.2.2 Overvoltage 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
  12. IMPORTANT NOTICE
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Data Sheet

AMC23C12 Fast Response, Reinforced Isolated Window Comparator
With Adjustable Threshold and Latch Function

1 Features

  • Wide high-side supply range: 3V to 27V
  • Low-side supply range: 2.7V to 5.5V
  • Adjustable threshold:
    • Window-comparator mode: ±20mV to ±300mV
    • Positive-comparator mode: 600mV to 2.7V
  • Reference current for threshold adjustment: 100μA, ±1%
  • Trip threshold error: ±1% (max) at 250mV
  • Open-drain output with optional latch mode
  • Propagation delay: 280ns (typ)
  • High CMTI: 55V/ns (min)
  • Safety-related certifications:
    • 7000VPK reinforced isolation per DIN EN IEC 60747-17 (VDE 0884-17)
    • 5000VRMS isolation for 1 minute per UL1577
  • Fully specified over the extended industrial temperature range: –40°C to +125°C

2 Applications

  • Overcurrent or overvoltage detection in:
    • Motor drives
    • Frequency inverters
    • Solar inverters
    • DC/DC converters

3 Description

The AMC23C12 is an isolated window comparator with a short response time. The open-drain output is separated from the input circuitry by an isolation barrier that is highly resistant to magnetic interference. This barrier is certified to provide reinforced galvanic isolation of up to 5kVRMS according to VDE 0884-17 and UL1577, and supports a working voltage of up to 1kVRMS.

The comparison window is centered around 0V, meaning that the comparator trips if the absolute value of the input voltage exceeds the trip threshold value. The trip threshold is adjustable from 20mV to 300mV through a single external resistor and, therefore, the comparison window ranges from ±20mV to ±300mV. When the voltage on the REF pin is greater than 550mV, the negative comparator is disabled and only the positive comparator is functional. The reference voltage in this mode ranges as high as 2.7V. This mode is particularly useful for monitoring voltage supplies.

The open-drain output on the device supports transparent mode (LATCH input tied to GND2) where the output follows the input state, or latch mode, where the output is cleared on the falling edge of the latch input signal.

The AMC23C12 is available in an 8-pin, wide-body SOIC package and is specified over the full automotive temperature range of –40°C to +125°C.

Package Information
PART NUMBERPACKAGE(1)PACKAGE SIZE(2)
AMC23C12DWV (SOIC, 8)5.85mm × 11.5mm
(1) For more information, see the Mechanical, Packaging, and Orderable Information.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
AMC23C12 Typical Application Typical Application

4 Pin Configuration and Functions

Figure 4-1 DWV Package,8-Pin SOIC(Top View)
Table 4-1 Pin Functions
PINTYPEDESCRIPTION
NO.NAME
1VDD1High-side powerHigh-side power supply(1)
2INAnalog inputAnalog input pin to the window comparator
3REFAnalog inputReference pin that defines the trip threshold. The voltage on this pin also affects the hysteresis of comparator Cmp0, as explained in the Reference Input section. This pin is internally connected to a 100μA current source. Connect a resistor from REF to GND1 to define the trip threshold, and a capacitor from REF to GND1 to filter the reference voltage. For best transient noise immunity, place the capacitor as closely to the pin as possible. This pin can also be driven by an external voltage source.
4GND1High-side groundHigh-side ground
5GND2Low-side groundLow-side ground
6OUTDigital outputOpen-drain output of the window comparator. Connect to an external pullup resistor.
7LATCHDigital inputDigital input to select latch mode (high) or transparent mode (low) of the open-drain output. Do not leave the input pin unconnected (floating). Connect to GND2 when not used.
8VDD2Low-side powerLow-side power supply(1)
(1) See the Power Supply Recommendations section for power-supply decoupling recommendations.

5 Specifications

5.1 Absolute Maximum Ratings

see(1)
MIN MAX UNIT
Power-supply voltage VDD1 to GND1 –0.3 30 V
VDD2 to GND2 –0.3 6.5
Analog input voltage REF to GND1 –0.5 6.5 V
IN to GND1  –6 5.5
Digital input voltage LATCH to GND2  –0.5 VDD2 + 0.5 V
Digital output voltage OUT to GND2  –0.5 VDD2 + 0.5 V
Input current Continuous, any pin except power-supply pins –10 10 mA
Temperature Junction, TJ 150 °C
Storage, Tstg –65 150
(1) Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime.

5.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
Charged-device model (CDM), per ANSI/ESDA/JEDEC JS-002(2) ±1000
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

 
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