UCC256402

• Optimized low power mode and burst mode algorithm
  • Burst mode with Soft-ON and Soft-OFF periods
  • Minimized audible noise at no load and standby
  • User option to disable burst mode
  • Opto-coupler low power operation
  • Efficiency performance exceeds DoE Level VI and EU CoC Tier-2 External Power Supply Standards
• Hybrid hysteretic control (HHC)
  • Best-in-class transient response
  • Fast exit from burst mode
• Robust adaptive dead-time control
• Integrated high-voltage gate driver with 0.6 A source and 1.2 A sink capability
• Robust capacitive region (ZCS) avoidance scheme
• Over temperature, output over voltage, input
  under voltage protection, three levels
  of over current protection
• Integrated high voltage startup function
• Active X-capacitor discharge function

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The UCC25640x 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.