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

6 UCC256402A Supports Input OVP to Protect PSU if Grid Voltage is Unstable

In some areas, the grid voltage is not stable and the grid voltage even up to two times than normal operation and is observed at the end of customer installment of the system. When there is 3 ph supply available, accidentally, the customer installs between L1 and L2 instead of L1 and N.

Another reason to cause the huge fluctuation in 1ph voltage due to the distribution transformer peak loading leading to >300VAC being common.

UCC256402A senses the bulk capacitor voltage by BLK pin to support the input over voltage protection function when grid voltage is abnormal or even up to two times than normal AC input.

UCC25640X also supports the 700V voltage rating at HV pin and HB pin to be more robust when grid voltage is unstable.