SLVAFH1A December   2022  – December 2023 TPS62933 , TPS62933F , TPS62933O , TPS62933P

 

  1.   1
  2.   Create an Inverting Power Supply Using a TPS6293x Buck Converter With Internal Compensation
  3.   Trademarks
  4. 1Configuring the Buck Converter for Inverting Buck-Boost Topology Application
  5. 2Choosing the Correct Buck Converter for Inverting Power Application
    1. 2.1 Output Voltage Range
    2. 2.2 Input Voltage Range
    3. 2.3 Output Current Range
  6. 3Selecting Applicable External Components for Inverting Power Application
    1. 3.1 Resistor Divider
    2. 3.2 Inductor and Output Capacitor Selection
      1. 3.2.1 Inductor Selection
        1. 3.2.1.1 Output Current
        2. 3.2.1.2 Inductor Current Ripple
      2. 3.2.2 Output Capacitor Selection
        1. 3.2.2.1 Large Load Transient
        2. 3.2.2.2 Output Ripple Voltage
    3. 3.3 Input Capacitors
    4. 3.4 Bypass Capacitor
    5. 3.5 Enabling and Adjusting UVLO
  7. 4Experimental Results
  8. 5Summary
  9. 6References
  10. 7Revision History

3 Selecting Applicable External Components for Inverting Power Application

When the appropriate buck converter is chosen, shown in Figure 3-1, the user must choose the correct external components such as a resistor divider, inductor, input capacitor, output capacitor, and bypass capacitor, for high, steady, and transient performance.

GUID-20231210-SS0I-4FBH-8NPW-X4N7GN63XV2L-low.svgFigure 3-1 12 V To –12 V Reference Design

For this design example, use the input parameters listed in Table 3-1.

Table 3-1 Design Parameters
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 ratingMaximum 1.2 A