TIDUEZ3A April   2021  – June 2022

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 LMG342xR030
      2. 2.3.2 TMS320F28002x
      3. 2.3.3 OPA607
      4. 2.3.4 UCC21222
  8. 3Hardware, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
    3. 3.3 Test Results
      1. 3.3.1 Test Procedures
      2. 3.3.2 Performance Data: Efficiency, iTHD, and Power Factor
      3. 3.3.3 Functional Waveforms
        1. 3.3.3.1 Current Sensing and Protection
        2. 3.3.3.2 Power Stage Startup and Input Waveforms
        3. 3.3.3.3 AC Drop Test
        4. 3.3.3.4 Surge Test
        5. 3.3.3.5 EMI Test
      4. 3.3.4 Thermal Test
      5. 3.3.5 GaN FET Switching Waveform
  9. 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
  10. 5About the Author
  11. 6Revision History

Current Sensing and Protection

Figure 3-5, Figure 3-6, and Figure 3-7 show the OPA607 current-sensing waveforms with 100 kHz, 500 kHz, and 1 MHz, respectively. The 220-ns phase delay, intentionally introduced to filter high frequency noise, can be optimized with system requestions.


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Figure 3-5 100-kHz Waveform

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Figure 3-7 1-MHz Waveform

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Figure 3-6 500-kHz Waveform

With the OPA607 amplifier and TLV3502 comparator, overcurrent protection for MOSFET response is validated as in Figure 3-8 shows the negative direction OCP response time and Figure 3-9 shows the positive direction OCP response time.


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Figure 3-8 Negative OCP Action

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Figure 3-9 Positive OCP Action