UCC28056: UCC28056 in a 250W LED power module design，questions about THD

Julia Ju

Part Number: UCC28056

Dears

based on this question:

My customer also have other questions, please check and support！

UCC28056 (used in 250W and 250W below LED power module):

When input voltage is 110Vac and 230Vac,half load, can the THD<10% ?

When input voltage is input voltage is 277 Vac,75% load, can the THD<10% ?

When the input voltage is 230 Vac and half load, can the power factor reach or greater than 0.95?

Thanks!

0 David Huang33 over 2 years ago

hello user,

thanks for your interest in UCC28056.

It is possible for UCC28056a to achieve 230VAC half load and 277VAC 75% load with <10%ithd. at this condition the controller works at DCM.

But it is very hard for the controller to achieve <10% at 115VAC input since the controller is working at TM mode., Below <20% is possible.

with DCM can have a better ithd compare to that working at TM mode for this controller.