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


Product details


Topology Half-Bridge, Resonant LLC Control method Current VCC (Min) (V) 13 VCC (Max) (V) 30 Duty cycle (Max) (%) 50 Frequency (Max) (kHz) 1000 Operating temperature range (C) -40 to 125 Gate drive (Typ) (A) 0.6 Features HV Start-up, Integrated Gate Drivers, Light Load Efficiency, Thermal Shutdown, Wide DC input, X cap discharge integrated Rating Catalog open-in-new Find other PWM controllers & resonant controllers

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SOIC (DDB) 14 59 mm² 9.9 x 6 open-in-new Find other PWM controllers & resonant controllers


  • 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)
  • LLC Resonant Controller in SOIC16
    with High Voltage Clearance
  • Create a Custom Design Using the UCC256301 With the WEBENCH® Power Designer

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The UCC256301 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. UCC256301 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.

UCC256301 uses hybrid hysteretic control to provide best in class line and load transient response. The control effort is approximately linear proportional to average input current in one cycle. The control makes the open loop transfer function a first order system so that it’s very easy to compensate. The system is always stable with proper frequency compensation.

UCC256301 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.

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Exact equivalent in functionality and parametrics to the compared device:
UCC256404 ACTIVE LLC resonant controller with ultra-low power, ultra-quiet standby operation and high voltage startup This product is the next generation update with enhanced features ie. light load mode and adaptive deadtime control.

Technical documentation

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Type Title Date
* Datasheet UCC256301 Hybrid Hysteretic Mode Wide VIN LLC Resonant Controller Enabling Ultra-Low Standby Power datasheet (Rev. C) Jan. 17, 2020
Application note Migrating to UCC25640x from UCC25630x (Rev. A) Dec. 10, 2019
Application note Improving Transient Response in LLC Converters Using Hybrid Hysteretic Control (Rev. A) Oct. 22, 2019
Application note Exceeding Modern Energy Standards with 'Always On' PFC and LLC Controllers​ (Rev. B) Aug. 01, 2019
Technical articles Three considerations for achieving high efficiency and reliability in industrial AC/DC power supplies Apr. 04, 2019
Technical articles How topology selection can help improve reliability in industrial AC/DC power supplies Feb. 14, 2019
Application note Improving ZVS and efficiency in LLC converters Nov. 05, 2018
User guide Using UCC25630-1EVM-291 (Rev. B) Jan. 30, 2018
Application note UCC25630x Practical Design Guidelines (Rev. A) Dec. 08, 2017
Technical articles “Peak current-mode control” in an LLC converter Nov. 16, 2017
Technical articles How to boost efficiency in your industrial AC/DC power supply Nov. 09, 2017
More literature IEC60065 Certification Nov. 07, 2017
More literature IEC60950 Certification Nov. 07, 2017
More literature IEC62368 Certification Nov. 07, 2017
Application note AC Ripple Rejection in AC/DC Systems Using LLC Oct. 31, 2017
Selection guide UCC25630x Selection Guide Aug. 29, 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development


UCC25630-1EVM-291 is an EVM of LLC resonant half-bridge DC-DC power converter with LLC controller UCC256301. UCC25630-1EVM-291 accepts DC line input from 340Vdc to 410Vdc, AC input voltage from 85 VAC to 264 VAC, and outputs nominal 12Vdc with full load output power 120W, or full output current 10A (...)

  • Optimized low power features enable extreme low standby power
  • Advanced burst mode with adaptive threshold
  • Improved capacitive region avoidance scheme
  • Adaptive dead-time
  • X-capacitor discharge

Design tools & simulation

SLUM596.ZIP (108 KB) - SIMPLIS Model
SLUC634B.ZIP (358 KB)

Reference designs

200W PFC + LCC resonant converter reference design for LED lighting
PMP20946 — This reference design uses the UCC28180 CCM PFC controller and the UCC256301 Wide Vin resonant controller as an LCC controller with an integrated driver. It provides up to 200-W constant current or constant voltage output from a universal AC input. An external analog dimming voltage signal can be (...)
document-generic Schematic
94.5% Efficiency, 500W industrial AC-DC reference design
TIDA-010015 — This reference design is a compact, high efficiency, 24-V DC, 500-W reference design for industrial AC/DC power supplies. This design consists of a front-end, two-phase interleaved transition mode (TM) power factor correction (PFC) based on the UCC28064A. This minimizes the PFC inductor size and (...)
document-generic Schematic
94% Peak efficiency, 150W norm, 240W peak industrial AC/DC power supply with CC/CV reference design
TIDA-010038 — This compact, high efficiency, 24V DC, 150W nominal, 240W peak output at 230VAC reference design is targeted for industrial AC/DC power supplies. The circuit consists of a frontend transition mode (TrM) power factor correction(PFC) circuit based on the UCC28056, followed by a robust LLC stage for an (...)
document-generic Schematic
480W, <17 mm, Thin Profile, 94% Efficiency, Fast Transient Response AC/DC SMPS Reference Design
TIDA-01495 — The TIDA-01495 is a low profile (17 mm height), 94.1% peak efficiency, high power density, universal input, 24-V DC, 480-W output, consumer AC/DC power supply reference design. The circuit consists of a front-end two phase interleaved transition mode (TM) power factor correction (PFC) based on the (...)
document-generic Schematic
200kHz LLC Series Resonant Converter Reference Design With Low Standby Power Consumption
PMP20795 — The PMP20795 reference design uses UCC256301 enhanced LLC controller with integrated driver to provide 24V/12A output from a nominal 380VDC input. UCC256301 provides hybrid hysteresis control (HHC) to enable a fast transient response. In this design, a 1st order system with over 6kHz bandwidth is (...)
document-generic Schematic
24-V, 480-W Nominal 720-W peak, >93.5% efficient, robust AC/DC industrial power supply reference
TIDA-01494 — The TIDA-01494 reference design is a compact, high efficiency, 24-V DC, 480-W nominal, 720-W peak output reference design for industrial AC/DC power supplies. The circuit consists of a front-end continuous conduction mode (CCM) power factor correction (PFC) circuit followed by a robust LLC stage (...)
document-generic Schematic
LLC Resonant Converter Control Card Reference Design
PMP40281 — This reference design is a a control card for LLC converter. It integrates all of the essential functions for controlling a LLC converter including the HV start-up, X-capacitor discharge and the drivers for the power FETs. By employing the advanced burst mode, it can also help the LLC converter to (...)
document-generic Schematic

CAD/CAE symbols

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