TIDUDJ6B August   2022  – February 2023 OPA388-Q1

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagrams
    2. 2.2 Highlighted Products
      1. 2.2.1 TPSI2140-Q1
      2. 2.2.2 AMC1301-Q1
      3. 2.2.3 SN6501-Q1
    3. 2.3 System Design Theory
      1. 2.3.1 Isolation Leakage Current Theory
      2. 2.3.2 High-Voltage Measurement
  8. 3Hardware, Testing Requirements, and Test Results
    1. 3.1 Required Hardware
    2.     Hardware with Solid-State Relay
    3. 3.2 Testing and Results
      1. 3.2.1 Test Setup
      2. 3.2.2 Isolation Tests
        1. 3.2.2.1 Normal Conditions
        2. 3.2.2.2 Isolation Error at HV Positive
        3. 3.2.2.3 Isolation Error at HV Negative
        4. 3.2.2.4 Isolation Error at ¼ HV Battery Voltage
        5. 3.2.2.5 Isolation Error at ¾ HV Battery Voltage
        6. 3.2.2.6 Isolation Error at the Middle of an HV Battery Voltage
      3. 3.2.3 Solid-State Relay Isolation Tests
        1. 3.2.3.1 Normal Conditions
        2. 3.2.3.2 Isolation Error at HV Positive
        3. 3.2.3.3 Isolation Error at HV Negative
        4. 3.2.3.4 Isolation Error at ¼ HV Battery Voltage
        5. 3.2.3.5 Isolation Error at ¾ HV Battery Voltage
        6. 3.2.3.6 Isolation Error at the Middle of an HV Battery Voltage
      4. 3.2.4 High Voltage Measurements
      5. 3.2.5 Isolation Measurement Analysis
      6. 3.2.6 Error Analysis
  9. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 PCB Layout Recommendations
      1. 4.3.1 Layout Prints
    4. 4.4 Altium Project
    5. 4.5 Gerber Files
    6. 4.6 Assembly Drawings
  10. 5Software Files
  11. 6Related Documentation
  12. 7Trademarks
  13. 8Revision History

3.2.1 Test Setup

Be sure to take safety precautions as provided by a lab safety team when performing isolation breakage tests. The test setup must comply with regional safety norms. Connect the reference design to the load card, power supplies, and measurement equipment as shown in #T5081059-28. Use a signal generator to control the relays of the design board. If any one of the relays is closed, isolation is broken on the respective voltage divider (positive or negative potential divider) to support the isolation measurements. Set a constant low-voltage supply to 5 V as per the design. Use an oscilloscope to monitor the analog voltages of the reference design. As part of the measurements, some of the tests are done to calculate the errors. Use a 6½ digit multimeter (DMM) to support the same. Connect the high-voltage power supply to both the design and its load card. Perform measurements at different voltages and at multiple error points with variable resistance.

To measure isolation leakage currents, R1, R2, R3, R4, R5, and R6 of the design are not populated. R14, R15, R16, R17, and R18 are populated to have 1.2 MΩ. This same resistor chain is used for R21, R22, R23, R24, and R25 to maintain symmetry. 100-kΩ resistors are populated in the load card, which support as potential dividers from the high-voltage to low-voltage section.

Due to test facility limitations, some of the measurements are performed at low voltage and prorated data to high voltage. Functional behavior, isolation leakage currents for these tests are maintained intact with appropriate changes to resistors and power source.

GUID-4A942D08-68B7-4DC0-86F0-B384CE6111D2-low.gif Figure 3-6 TIDA-01513 Test Setup