cupoftea
Advanced Member level 5
How does the UCC28070A manage in DCM?
If you have a 60kHz 1kW PFC over 100-265VAC (390Vout), then a sendust inductor which spans 250uH to 212uH sounds reasonable. However, at say 250W load and 240VAC input, the inductor current will be in DCM. How does the UCC28070A manage this when it does its inductor downslope reconstruction? Does it result in more THD than say using a L4981A or a UC3854 controller?
UCC28070A
Attached is LTspice of it at 100VAC
If you have a 60kHz 1kW PFC over 100-265VAC (390Vout), then a sendust inductor which spans 250uH to 212uH sounds reasonable. However, at say 250W load and 240VAC input, the inductor current will be in DCM. How does the UCC28070A manage this when it does its inductor downslope reconstruction? Does it result in more THD than say using a L4981A or a UC3854 controller?
UCC28070A
Attached is LTspice of it at 100VAC