8-Pin High-Performance Resonant Mode LLC Controller - UCC25600


8-Pin High-Performance Resonant Mode LLC Controller



The UCC25600 high performance, resonant mode controller is designed for dc-to-dc applications using resonant topologies, especially the LLC half-bridge resonant converter. This highly integrated controller implements frequency modulation control and complete system functions in only an 8-pin package. Switching to the UCC25600 will greatly simplify the system design and layout, and improve time to market, all at a price point lower than competitive 16-pin device offerings.

The internal oscillator supports the switching frequencies from 40 kHz to 350 kHz. This high-accuracy oscillator realizes the minimum switching frequency limiting with 4% tolerance, allowing the designer to avoid over-design of the power stage and, thus, further reducing overall system cost. The programmable dead time enables zero-voltage switching with minimum magnetizing current. This maximizes system efficiency across a variety of applications. The programmable soft-start timer maximizes design flexibility demanded by the varied requirements of end equipment using a half-bridge topology. By incorporating a 0.4-A source and 0.8-A sink driving capability, a low cost, reliable gate driver transformer is a real option.

The UCC25600 delivers complete system protection functions including overcurrent, UVLO, bias supply OVP, and overtemperature protection.


  • Variable Switching Frequency Control
  • Programmable Minimum Switching Frequency
    With 4% Accuracy (3% Accuracy at Temperature
    Range: –20°C to 105°C)
  • Programmable Maximum Switching Frequency
  • Programmable Dead Time for Best Efficiency
  • Programmable Soft-Start Time
  • Easy ON and OFF Control
  • Overcurrent Protection
  • Overtemperature Protection
  • Bias Voltage UVLO and Overvoltage Protection
  • Integrated Gate Driver With 0.4-A Source and 0.8-
    A Sink Capability
  • Operating Temperature Range: –40°C to 125°C
  • SOIC 8-Pin Package

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Parametrics Compare all products in PWM and Resonant Controller

Control Method
Vin (Min) (V)
Vin (Max) (V)
Frequency (Max) (kHz)
Duty Cycle (Max) (%)
Gate Drive (Typ) (A)
Special Features
Operating Temperature Range (C)
UCC25600 UCC256301
Resonant LLC   
Resonant LLC   
Voltage    Current   
410    600   
350    1000   
50    50   
0.8    0.6   
  HV Start-up
Light Load Efficiency
Low Power
Soft Start
Soft Switching
Thermal Shutdown   
Catalog    Catalog   
-40 to 125    -40 to 125