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

8 Summary

This application note contains the benefit of using UCC25640X at LED lighting PSU. The key benefit used previously is repeated here.

  1. UCC25640X HS pin has wide dv/dt sensing range and is very helpful for LED lighting PSU to optimize the resonant tank design and also adding the CDS for EMI performance.
  2. The cost is the top priority for customer, so UCC256402/4 also supports the HV startup to charge the Vcc capacitor by itself, then the customer can save the cost of Auxpower.
  3. LED lighting PSU also needs to support wide ambient temperature, and causes the Vcc equivalent capacitance drifted so higher Vcc startup voltage helps to avoid Vcc dropped to UVLO during startup.
  4. LED lighting PSU needs to avoid the burst mode to cause the LED flicking, but still needs to minimize the no load power consumption, so programmable burst mode threshold is helpful to balance the trade-off.
  5. UCC25640x also has diversity version to fulfill different requirement.