TIDUEZ8C december   2022  – june 2023

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Insulation Monitoring
    2. 1.2 Impact of Parasitic Isolation Capacitance
    3. 1.3 IEC 61557-8 Standard for Industrial Low-Voltage Distribution Systems
    4. 1.4 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Highlighted Products
      1. 2.2.1 TPSI2140
      2. 2.2.2 AMC3330
      3. 2.2.3 TPS7A24
      4. 2.2.4 REF2033
      5. 2.2.5 TLV6001
    3. 2.3 Design Considerations
      1. 2.3.1 Resistive Bridge
      2. 2.3.2 Isolated Analog Signal Chain
        1. 2.3.2.1 Differential to Single-Ended Conversion
        2. 2.3.2.2 High-Voltage Measurement
        3. 2.3.2.3 Signal Chain Error Analysis
      3. 2.3.3 Loss of PE Detection
      4. 2.3.4 Insulation Monitoring on AC Lines
      5. 2.3.5 PCB Layout Recommendations
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 Connectors
      2. 3.1.2 Default Jumper Configuration
      3. 3.1.3 Prerequisites
    2. 3.2 Software Requirements
    3. 3.3 Software
    4. 3.4 Test Setup
    5. 3.5 Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  11. 5About the Author
  12. 6Revision History

1.4 Key System Specifications

Table 1-1 Key System Specifications
PARAMETER SPECIFICATION MEASUREMENT(1)
Isolation voltages accuracy 1% 0.37%

Isolation voltage settling time at ADC input

400 μs

300 μs(2)
Isolation resistances 20 kΩ < RISO < 5 MΩ
Symmetrical fault (40 kΩ) 5% 1.54%
Asymmetrical fault (40 kΩ) 5% 3.63%
Symmetrical warning (200 kΩ) 5% 1.51%
Asymmetrical warning (200 kΩ) 5% 3.78%
(1) 400-V system, uncalibrated gain and offset, 0.1% accurate resistors, room temperature
(2) Test system with negligible insulation capacitance. For systems with higher insulation capacitance see Section 1.2.
Table 1-2 Key Electrical Specifications
PARAMETER VALUE COMMENT
DC input voltage

5 V ±5% (typical)

5 V to 12 V

5-V input can come from the LAUNCHXL-F280049C break-out power output, current limited by LMR6242, nominal rating 2.1 A.

If evaluation without the LAUNCHXL-F280049C takes place, the board can also be powered from a 5- to 12-V voltage source through the front connector.

DC input current 50 mA (typical) When the switches are on and the bus voltage monitoring is used
Power consumption 0.25 W (typical) Total board consumption, measured on the 5-V supply
I/O interface signaling voltage 3.3 V 3.3-V fail-safe I/O. Compatible with the TI LaunchPad Development Kit
Temperature range –40°C to 85°C Industrial temperature range –40°C to 85°C
GUID-E6E50D60-2200-40DA-9902-3DC3155245EF-low.gif
CAUTION:

Do not leave the design powered when unattended.
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WARNING:

High voltage! There are accessible high voltages present on the board. Electric shock is possible. The board operates at voltages and currents that can cause shock, fire, or injury if not properly handled. Use the equipment with necessary caution and appropriate safeguards to avoid injuring yourself or damaging property. For safety, use of isolated test equipment with overvoltage and overcurrent protection is highly recommended.

TI considers it the user's responsibility to confirm that the voltages and isolation requirements are identified and understood before energizing the board or simulation. When energized, do not touch the design or components connected to the design.
GUID-D9BEBC20-188D-4CBD-A202-356FDC060593-low.gif
WARNING:

Hot surface! Contact can cause burns. Do not touch!

Some components can reach high temperatures > 55°C when the board is powered on. Do not touch the board at any point during operation or immediately after operating, as high temperatures can be present.
GUID-E6E50D60-2200-40DA-9902-3DC3155245EF-low.gif
WARNING:

TI intends this reference design to be operated in a lab environment only and does not consider the reference design to be a finished product for general consumer use. The design is intended to be run at ambient room temperature and is not tested for operation under other ambient temperatures.

TI intends this reference design to be used only by qualified engineers and technicians familiar with risks associated with handling high-voltage electrical and mechanical components, systems, and subsystems.

There are accessible high voltages present on the board. The board operates at voltages and currents that can cause shock, fire, or injury if not properly handled or applied. Use the equipment with necessary caution and appropriate safeguards to avoid injuring yourself or damaging property.