矽力杰产品规格书SY5055.pdf

Application Note: SY5055 PFC+LLC Combo Controller Advanced Design Specification General Description Features The SY5055 is a PFC+LLC combo controller, which • PF>0.95, THD<5% integrates a boost PFC controller and a resonant half- • Boost Quasi Resonant (QR) Operation bridge controller. Boost converter works in CrM/DCM mode to • Boost Burst Operation at Light Load minimize switching losses and get better EMI • LLC Fast Dynamic Response performance. Proprietary control is adopted to get unity PF and lowest THD. Burst function increases • LLC Integrated Half Bridge Driver efficiency at low load. Reliable input BO/BI • Input BO/BI Protection protection, boost output OVP/UVP, over current protection, boost feedback protection guarantee safety • Boost Output, LLC Output OVP Protection work. • Cycle by Cycle Peak Current Protection LLC converter with proprietary control achieves fast dynamic response and easy loop compensation • Over Temperature Protection parameters design, also peripheral devices count are greatly reduced to save BOM cost. Output OVP and • LLC Capacitive Mode Protection OTP, OLP protect safety operation Ordering Information