UCC256303 LLC Resonant Controller

Texas Instruments' UCC256303 LLC resonant controller enables ultra-low standby power

Image of Texas Instruments' UCC256303 LLC Resonant ControllerTexas Instruments' UCC256303 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. UCC256303 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.

UCC256303 uses hybrid hysteretic control to provide best in class line and load transient response. The control effort is approximately linearly proportional to average input current in one cycle. The control makes the open loop transfer function a first order system so that it is very easy to compensate. The system is always stable with proper frequency compensation.

UCC256303 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.

Features
  • Hybrid hysteretic control (HHC)
    • Best-in-class transient response
    • Easy compensation design
  • Optimized low power features enable 75 mW
  • Standby power design with PFC on
    • Advanced burst mode opto-coupler low power operation
    • Helps enable compliance to CoC Tier II standard
  • Fast exit from burst mode
  • Improved capacitive region avoidance scheme
  • Adaptive dead-time
  • Internal high-side gate drivers (0.6 A and 1.2 A capability)
  • Robust soft start with no hard switching
  • Overtemperature, output overvoltage, input over- and undervoltage protection with three levels of over current protections
  • Wide operating frequency range (35 kHz to 1 MHz)
  • LLC resonant controller in SOIC16 with high voltage clearance
  • External bias required
  • Create a custom design using the UCC256303 with the WEBENCH® Power Designer
Applications
  • Digital TV SMPS
  • AC-DC adapters
  • Gaming
  • Desktop PCs

UCC256303 LLC Resonant Controller

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
UCC25630-3DDBT datasheet linkHALF BRIDGE CONT WITH HV DRIVERUCC25630-3DDBTHALF BRIDGE CONT WITH HV DRIVER232 - Immediate
UCC25630-3DDBT product page link
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Published: 2017-12-21