The UCC256301 is a fully featured LLC controller with integrated high-voltage gate
driver. It has been designed to pair with a PFC stage to provide a complete power system using a
minimum of external components. The resulting power system is designed to meet the most stringent
requirements for standby power without the need for a separate standby power converter, and with
PFC stage running all the time. UCC256301 includes a range of features designed to make LLC
converter operation well controlled and robust. This device aims to unburden the LLC designer and
allow mainstream applications to benefit from efficiency advantages of the LLC topology.
UCC256301 uses hybrid hysteretic control to provide best in class line and load transient
response. The control effort is approximately linear proportional to average input current in one
cycle. The control makes the open loop transfer function a first order system so that it’s very
easy to compensate. The system is always stable with proper frequency compensation.
UCC256301 provides a high efficient burst mode with consistent burst power level during
each burst on cycle. The burst power level is programmable and adaptively changes with input
voltage, making the optimization of efficiency very easy.
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