SLVSHI9A March   2025  – September 2025 TPS7H5020-SEP , TPS7H5020-SP

PRODMIX  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  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
      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

8.2.4 Boost Converter

The TPS7H502x can be utilized in a non-synchronous boost configuration, as depicted in the simplified schematic in Figure 8-5.

TPS7H5020-SEP TPS7H5020-SP TPS7H5021-SEP TPS7H5021-SP Simplified Schematic of Boost Converter Using TPS7H5020 Figure 8-5 Simplified Schematic of Boost Converter Using TPS7H5020

The guidance for component selection specific to the TPS7H502x controller in the boost configuration is the similar as that detailed in Detailed Design Procedure. The primary differences lie in the power stage component selection, which can be determined as detailed in Calculation of a Boost Converter's Power Stage. Furthermore, the compensation component selection is detailed for the boost converter in Frequency Compensation. Some of the key considerations for the boost converter are:

  • The peak FET current for the boost converter is equal to the input current, not the load current. Size the FET appropriately to handle the input current for the application, which is higher than that at the load.
  • There is a direct path between the input supply and load. A short circuit at the load can cause a large current to flow from input to output and lead to the output voltage being pulled down to the input voltage or below. If the converter must survive the short circuit, consider adding a disconnect switch between the input and output that can be opened during the fault condition. This switch contributes an extra voltage drop to the system during normal operation, which reduces the overall efficiency.
  • The effect of the RHP zero of the boost converter needs to be accounted for when determining compensation for the converter, as mentioned in Frequency Compensation.

An evaluation module using the TPS7H5020 in a boost configuration has been designed with the parameters as shown in Table 8-2.

Table 8-2 Design Parameters for TPS7H5020EVM
DESIGN PARAMETER VALUE
Input voltage range 5V to 12V
Output voltage 15V±10%
Maximum output current 1A
Switching frequency 1MHz
Target bandwidth 4.5kHz
Full load step (1A) transient response ≤450mV

Refer to the TPS7H5020EVM user's guide for a more detailed examination of the boost converter schematic and testing results.