SNVAAA6 September   2024 LM61495

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1OLED Driving Scheme
  5. 2Inverting Buck-Boost Concept
  6. 3PMP23333 Introduction
    1. 3.1 PMP23333 Schematic
  7. 4Design Considerations
    1. 4.1 VIN, VOUT Range
    2. 4.2 Inductor Selection and Maximum Output Current
    3. 4.3 Capacitor Selection
    4. 4.4 Efficiency and Thermal Considerations
    5. 4.5 Optional Enable (EN) Level Shifter
  8. 5Summary
  9. 6References

5 Summary

Due to the trend of using negative output voltage for ELVSS power rail in OLED panel, Inverting Buck-Boost (IBB) topology gets more common for the applications such as monitor, TV using OLED panel. This application note addresses the key design considerations to achieve IBB topology using standard buck converter. TI reference design PMP23333, Synchronous Inverting Buck-Boost Converter Reference Design for Communications Equipment using L61495 is utilized. LM61495 is a good option for IBB design since LM61495 can operate under a wide input voltage range from 3V to 36V and have transient tolerance up to 42V which can give proper design flexibility to designers. Designers can refer to this application note as a start point to design the IBB converter. This application note is not only limited to OLED panel applications but also telecom application or other applications requiring negative output power.