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Wide vin LLC resonant controller with high-voltage start up enabling low standby power

Inventory: 10,019

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Packaging information

Package | Pins SOIC (DDB) | 14
Operating temperature range (°C) Q (-40 to 125)
Package qty | Carrier: 2,500 | SMALL T&R
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Quality information

RoHS Yes
Lead finish / Ball material NIPDAU
MSL rating / Peak reflow Level-2-260C-1 YEAR
Material content View
DPPM / MTBF / Fit rate View
Qualification summary View
Ongoing reliability monitoring View
Device marking View


  • Hybrid Hysteretic Control (HHC)
    • Best-in-Class Transient Response
    • Easy CompensationDesign
  • 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 IIStandard
  • 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
  • Over Temperature, Output Over Voltage, Input
    Over and Under Voltage Protection with
    Three Levels of Over Current Protections
  • Wide Operating Frequency Range
    (35 kHz to 1 MHz)
  • Nemko Certification for X Cap Discharge Function
  • Wide DC Input Range
  • Enables Wide AC Input Range
  • PFC Startup Not Required For LLC Startup
  • Create a Custom Design Using the UCC256304 With the WEBENCH® Power Designer

All trademarks are the property of their respective owners.


The UCC256304 is a fully featured LLC controller with integrated high-voltage gatedriver. It has been designed to pair with a PFC stage to provide a complete power system using aminimum of external components. The resulting power system is designed to meet the most stringentrequirements for standby power without the need for a separate standby power converter.UCC256304uses hybrid hysteretic control to provide best in class line and load transient response. Thecontrol makes the open loop transfer function a first order system so that it’s very easy tocompensate and is always stable with proper frequency compensation.

The UCC256304 is unique in that the controller is able to operate over a large DC inputrange. This is accomplished by making the input overvoltage sense threshold much larger than theinput voltage start threshold. This allows the LLC to startup and enter a low power standby modewithout the need to enable the PFC and enables the LLC to accommodate an extensive range of commonAC inputs.

UCC256304 provides a highly efficient burst mode with consistent burst power level duringeach burst on cycle. The burst power level is programmable and adaptively changes with inputvoltage.

Qty Price
1-99 $1.28
100-249 $1.06
250-999 $0.76
1,000+ $0.57

Alternative carriers

Part number UCC25630-4DDBT
Package qty | Carrier 250 | SMALL T&R
Inventory 4,486
Qty | Price (USD) 1ku | $0.65