UCC29950D

PFC/LLC CONTROLLER, CCM, 18V, SOIC-16.

The UCC29950D is a continuous conduction-mode Power Factor Correction (PFC) and LLC Combo Controller 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.