is a fully featured LLC controller with integrated high-voltage gate driver. It has been designed
to pair with a PFC controller 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.
UCC25640x provides a highly efficient burst mode with soft-on and soft-off periods to
minimize audible noise at standby operation. The burst power level and hysteresis are programmable,
simplifying the optimization of efficiency and burst mode operation. Burst mode can also be
disabled through pin configuration. UCC25640x uses hybrid hysteretic control to provide best in
class line and load transient response.
UCC25640x includes a range of features designed to make LLC converter operation well
controlled and protected. It can be used with UCC28056 or UCC28064A PFC controllers, along with
UCC24624 synchronous rectifier controller to offer a complete power supply solution.
UCC25640EVM-020 is a 180W, LLC resonant converter using UCC256404. This EVM accepts DC input from 360V to 410V, AC input voltage from 85VAC to 264VAC and outputs 12VDC with 180W full load output power.
Optimized burst mode function for low audible noise and low standby power
Integrated high voltage startup and integrated gate drivers reducing total BOM count
Robust protection features including overvoltage, overcurrent and zero current switching detection