SLUAAK3 January   2024 UCC256402

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2UCC25640X HS Pin Has Wide dv/dt Sensing Range
  6. 3UCC256402/4 Eliminating the Need for the Auxpower
  7. 4UCC25640X has Higher Vcc Startup Voltage to Support Lower Vcc Capacitance
  8. 5UCC25640X has Programmable Burst Mode Threshold
  9. 6UCC256402A Supports Input OVP to Protect PSU if Grid Voltage is Unstable
  10. 7UCC25640X has Diversity Version for Each Application
  11. 8Summary
  12. 9References

1 Introduction

LLC topology normally used in the isolation DC to DC stage for the 100W to approximately KW power rating because LLC is the soft switching topology to gain the best efficiency entire loading. This benefit is more significant in the lighting applications because it requires the ambient temperature up to 90℃ but without the air flow for thermal dissipation the LLC topology needs the best efficiency to avoid the power stage component over temperate stress. However, the LLC resonant tank design is not designed for wide input or output voltage range. This application note introduces the resonant tank design for lighting application and how UCC25640X addresses several limitations for the lighting application.

GUID-20221229-SS0I-D3QS-12H4-MRGQG4GD2DGH-low.png Figure 1-1 UCC25640X Simplified Schematic