UCC256402 LLC Resonant Controller with Ultra-Low Audible Noise

Texas Instruments' UCC256402 is a fully-featured LLC controller with an integrated high-voltage gate driver. This device is designed to pair with a PFC controller to provide a complete power system using minimal 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. The UCC256402 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 be disabled through pin configuration. This controller uses hybrid hysteretic control (HHC) to provide best-in-class line and load transient response.

The UCC256402 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 the UCC24624 synchronous rectifier controller to offer a complete power supply solution.