The UCC29950 provides all the control functionality for an AC-to-DC converter with a CCM
boost Power Factor Correction (PFC) stage followed by an LLC converter stage. The controller is
optimized to allow ease of use.
Proprietary CCM PFC algorithms enable the system to achieve high efficiency, smaller
converter size with high power factor. The integrated LLC controller enables a high-efficiency
DC-to-DC conversion stage utilizing soft switching for low EMI noise. Integration of PFC control
and LLC control in a combo controller allows the control algorithms to take advantage of
information from both stages.
The controller includes a control circuit for start-up using a Depletion Mode MOSFET with
internal device power management that minimizes external component requirements and helps lower
system implementation costs.
To further reduce the standby power an X-Cap discharge circuit is integrated. The
UCC29950 implements a complete suite of system protection functions, including AC line brownout,
PFC bus under voltage PFC and LLC, over current and thermal shutdown.
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