Wide Vin LLC Resonant Controller With High-Voltage Start Up Enabling Low Standby Power - UCC256304

UCC256304 (ACTIVE)

Wide Vin LLC Resonant Controller With High-Voltage Start Up Enabling Low Standby Power

 

Description

The UCC256304 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.UCC256304 uses hybrid hysteretic control to provide best in class line and load transient response. The control makes the open loop transfer function a first order system so that it’s very easy to compensate and is always stable with proper frequency compensation.

The UCC256304 is unique in that the controller is able to operate over a large DC input range. This is accomplished by making the input overvoltage sense threshold much larger than the input voltage start threshold. This allows the LLC to startup and enter a low power standby mode without the need to enable the PFC and enables the LLC to accommodate an extensive range of common AC inputs.

UCC256304 provides a highly 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.

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
  • 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

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Parametrics Compare all products in PWM and Resonant Controller

 
Topology
Control Method
Vin (Min) (V)
Vin (Max) (V)
Frequency (Max) (kHz)
Duty Cycle (Max) (%)
Gate Drive (Typ) (A)
Features
Rating
Operating Temperature Range (C)
Pin/Package
UCC256304 UCC25600 UCC256301 UCC256303
Half-Bridge
Resonant LLC   
Half-Bridge
Resonant LLC   
Half-Bridge
Resonant LLC   
Half-Bridge
Resonant LLC   
Current    Voltage    Current    Current   
  370       
600    410    600    600   
1000    350    1000    1000   
50    50    50    50   
0.6    0.8    0.6    0.6   
HV Start-up
Light Load Efficiency
Low Power
Soft Start
Soft Switching
Thermal Shutdown   
  HV Start-up
Light Load Efficiency
Low Power
Soft Start
Soft Switching
Thermal Shutdown   
Light Load Efficiency
Low Power
Soft Start
Soft Switching
Thermal Shutdown   
Catalog    Catalog    Catalog    Catalog   
-40 to 125    -40 to 125    -40 to 125    -40 to 125   
14SOIC    8SOIC    14SOIC    14SOIC   
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New! Interactive Design
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WEBENCH® Designer UCC256304

  Min   Max Range
Vin  V 30.0 to 500.0V
Vout  V 5 to 400V
Iout  A ≤ 100A
Ambient Temp  °C -40 to 125°C


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