UCC256302 (ACTIVE)

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

 

Description

The UCC256302 is a fully featured LLC controller with integrated high-voltage gate driver. It has been designed for use in offline AC-DC or isolated DC-DC 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.

UCC256302 includes an integrated, high voltage startup function which eliminates the need for an external bias supply, reducing BOM count and minimizing solution size. UCC256302 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.

UCC256302 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.

Select the appropriate LLC resonant controller for your design with UCC25630x Selection Guide

Features

  • Integrated High Voltage Startup
    • Eliminates Need for External
      Bias Supply
  • Best-in-Class Transient Response
  • 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)
  • Select the appropriate LLC resonant controller for your design with UCC25630x Selection GuideUCC25630x Selection Guide
  • Create a Custom Design Using the UCC256302 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
UCC256302 UCC25600 UCC256301 UCC256303 UCC256304
Half-Bridge
Resonant LLC   
Half-Bridge
Resonant LLC   
Half-Bridge
Resonant LLC   
Half-Bridge
Resonant LLC   
Half-Bridge
Resonant LLC   
Current    Voltage    Current    Current    Current   
  370         
600    410    600    600    600   
1000    350    1000    1000    1000   
50    50    50    50    50   
0.6    0.8    0.6    0.6    0.6   
HV Start-up
Light Load Efficiency
Thermal Shutdown   
  HV Start-up
Light Load Efficiency
Thermal Shutdown
Wide DC input
X cap discharge integrated   
Light Load Efficiency
Supports external bias
Thermal Shutdown   
HV Start-up
Light Load Efficiency
Thermal Shutdown
Wide AC input
Wide DC input
X cap discharge integrated   
Catalog    Catalog    Catalog    Catalog    Catalog   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
14SOIC    8SOIC    14SOIC    14SOIC    14SOIC   

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WEBENCH® Designer UCC256302

  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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