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

Abstract

This application note describes design considerations to achieve Inverting Buck-Boost (IBB) topology using standard buck converter for display applications especially OLED panel. OLED panel normally requires positive and negative voltage power rails which is called ELVDD and ELVSS to light OLED. To make the design simple, it is common to implement IBB topology using standard buck converter to source negative voltage also considering PCB size, BOM cost. This application note uses the TI's reference design PMP23333 using LM61495. LM61495 can operate under a wide input voltage range for 3V to 36V and 10A load capability which is good enough to design IBB converter for OLED panel. This design is not only limited to OLED panel applications but also telecom application or other applications requiring negative output power.