TIDUE82A November   2021  – April 2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
    4. 2.4 System Design Theory
      1. 2.4.1 Inverting Power Supply Design Using TPS62933
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
    3. 3.3 Test Results
      1. 3.3.1 Start-up
      2. 3.3.2 Load Transient
      3. 3.3.3 Output Ripple
      4. 3.3.4 Thermal Performance
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 PCB Layout Recommendations
      4. 4.1.4 Altium Project
      5. 4.1.5 Gerber Files
      6. 4.1.6 Assembly Drawings
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  11. 5About the Author
  12. 6Revision History

1 System Description

The TIDA-050053 enables a very simple inverting buck-boost design where the output voltage is inverted or negative with respect to ground by using the TPS62933 high efficiency and low-IQ synchronous buck converter. This design demonstrates an inverting power supply to generate a –12-V rail at up to 1.2 A of current from 8-V to 16-V input voltage. The optimized internal loop compensation eliminates external compensation components. A negative voltage is required in low-current negative rails for an operational amplifier, optical module biasing, or line drives and other applications.

Table 1-1 Key System Specifications
Design ParameterExample Value
Input voltage range12-V nominal 8 V to 16 V
Output voltage range–12 V

Transient response, 50% load step

∆VO = ±5%
Output ripple voltage1%
Output current rating

1.2 A