SLVSHI9E March   2025  – April 2026 TPS7H5020-SEP , TPS7H5020-SP , TPS7H5021-SEP , TPS7H5021-SP , TPS7H5030-SEP , TPS7H5030-SP , TPS7H5031-SEP , TPS7H5031-SP

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Tables
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Quality Conformance Inspection
    7. 6.7 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Input Voltage (VIN) and VLDO
      2. 7.3.2  Driver Input Voltage (PVIN)
      3. 7.3.3  Start-Up
      4. 7.3.4  Enable and Undervoltage Lockout (UVLO)
      5. 7.3.5  Voltage Reference
      6. 7.3.6  Error Amplifier
      7. 7.3.7  Output Voltage Programming
      8. 7.3.8  Soft Start (SS)
      9. 7.3.9  Switching Frequency and External Synchronization
        1. 7.3.9.1 Internal Oscillator Mode
        2. 7.3.9.2 External Synchronization Mode
          1. 7.3.9.2.1 External Synchronization with TPS7H5021 and TPS7H5031
      10. 7.3.10 Duty Cycle Limit
      11. 7.3.11 Minimum On-Time and Off-Time
      12. 7.3.12 Pulse Skipping
      13. 7.3.13 Leading Edge Blank Time
      14. 7.3.14 Current Sense and PWM Generation (CS_ILIM)
      15. 7.3.15 Gate Driver Output
      16. 7.3.16 Unpowered Voltage Clamp
      17. 7.3.17 Sourcing Driver Return (OUTH_REF)
      18. 7.3.18 Slope Compensation (RSC)
      19. 7.3.19 Frequency Compensation
      20. 7.3.20 Thermal Shutdown
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Switching Frequency
        2. 8.2.2.2  Output Voltage Programming Resistor Selection
        3. 8.2.2.3  Driver PVIN Configuration
        4. 8.2.2.4  Soft-Start Capacitor Selection
        5. 8.2.2.5  Transformer Design
        6. 8.2.2.6  Primary Power Switch Selection
        7. 8.2.2.7  Output Diode Selection
        8. 8.2.2.8  RCD Clamp
        9. 8.2.2.9  Output Capacitance Selection
        10. 8.2.2.10 Current Sense Resistor
        11. 8.2.2.11 Frequency Compensation Component Selection
      3. 8.2.3 Application Curves
      4. 8.2.4 Boost Converter
      5. 8.2.5 Feedback Isolation Using ISOS510
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

8.2.5 Feedback Isolation Using ISOS510

A simplified schematic for an isolated forward converter utilizing the TPS7H5021 device is shown in Figure 8-6. This forward converter implementation utilizes the ISOS510 and a shunt voltage reference, such as the TL1431-SP, for providing the isolated feedback of the converter. The ISOS510 is a current-driven analog isolator with transistor output, a radiation-tolerant alternative to an optocoupler for providing isolated feedback in space-grade converter designs. The device offers a SiO2 isolation barrier between the input and output and stable current transfer ratio (CTR) across temperature, lifetime, and radiation. For additional details, refer to the ISOS510 data sheet.

TPS7H5020-SP TPS7H5021-SP TPS7H5030-SP TPS7H5031-SP TPS7H5020-SEP TPS7H5021-SEP TPS7H5030-SEP TPS7H5031-SEP Forward Converter Using TPS7H502x Controller and ISOS510 for Feedback Figure 8-6 Forward Converter Using TPS7H502x Controller and ISOS510 for Feedback

A voltage divider at the output is used to provide the reference input for the shunt regulator. This input is compared to the internal shunt reference, and based on the converter output voltage the current demanded by the shunt reference varies to regulate the reference output. The shunt reference current sets the forward current for the input of the ISOS510. The output current of the ISOS510 is proportional to this input current and is used in conjunction with passive components to provide the feedback for the controller at the VSENSE pin. Since the ISOS510 has low current requirements, the output transistor can be powered using the VLDO output of the TPS7H502x controller, provided that the user adheres to the VLDO output current requirements as detailed in Specifications.