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UCC256403

ACTIVE

LLC resonant controller with ultra-low power and ultra-quiet standby operation

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Data sheet

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UCC25661 ACTIVE Wide VIN and VOUT 750KHz LLC controller with high-voltage startup Capable of higher operating frequency and supports wider VIN/VOUT operation

UCC256403

ACTIVE
Data sheet Order now

Product details

Topology Half bridge, LLC Control mode Current Features High voltage gate driver integrated, Hybrid hysteretic control, LLC, Light load efficiency, Light-load efficiency, Low power, Over Temperature Protection, Programmable soft start, Thermal shutdown, USB C/PD compatible, Zero voltage switching
Topology Half bridge, LLC Control mode Current Features High voltage gate driver integrated, Hybrid hysteretic control, LLC, Light load efficiency, Light-load efficiency, Low power, Over Temperature Protection, Programmable soft start, Thermal shutdown, USB C/PD compatible, Zero voltage switching
SOIC (DDB) 14 59.4 mm² (9.9 mm × 6 mm)
  • Optimized low-power mode and burst mode algorithm
    • Burst mode with Soft-ON and Soft-OFF periods
    • Minimized audible noise at no load and standby
    • User option to disable burst mode
    • Opto-coupler low-power operation
    • Efficiency performance exceeds DoE Level VI and EU CoC Tier-2 External Power Supply Standards
  • Hybrid hysteretic control (HHC)
    • Best-in-class transient response
    • Fast exit from burst mode
  • Robust adaptive dead-time control
  • Integrated high-voltage gate driver with 0.6A source and 1.2A sink capability
  • Robust capacitive region (ZCS) avoidance scheme
  • Over temperature, output over voltage, input undervoltage protection, three levels of overcurrent protection
  • Integrated high voltage startup function
  • Active X-capacitor discharge function
  • Optimized low-power mode and burst mode algorithm
    • Burst mode with Soft-ON and Soft-OFF periods
    • Minimized audible noise at no load and standby
    • User option to disable burst mode
    • Opto-coupler low-power operation
    • Efficiency performance exceeds DoE Level VI and EU CoC Tier-2 External Power Supply Standards
  • Hybrid hysteretic control (HHC)
    • Best-in-class transient response
    • Fast exit from burst mode
  • Robust adaptive dead-time control
  • Integrated high-voltage gate driver with 0.6A source and 1.2A sink capability
  • Robust capacitive region (ZCS) avoidance scheme
  • Over temperature, output over voltage, input undervoltage protection, three levels of overcurrent protection
  • Integrated high voltage startup function
  • Active X-capacitor discharge function

The UCC25640x is a fully featured LLC controller with integrated high-voltage gate driver. UCC25640x is designed to pair with a PFC controller 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.

UCC25640x provides a highly efficient burst mode with soft-on and soft-off periods to minimize audible noise at standby operation. The burst power level and hysteresis are programmable, simplifying the optimization of efficiency and burst mode operation. Disable burst mode through the pin configuration. UCC25640x uses hybrid hysteretic control to provide best in class line and load transient response.

UCC25640x includes a range of features designed to make LLC converter operation well controlled and protected. Use UCC25640x with UCC28056 or UCC28064A PFC controllers, along with a UCC24624 synchronous rectifier controller to offer a complete power supply option.

The UCC25640x is a fully featured LLC controller with integrated high-voltage gate driver. UCC25640x is designed to pair with a PFC controller 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.

UCC25640x provides a highly efficient burst mode with soft-on and soft-off periods to minimize audible noise at standby operation. The burst power level and hysteresis are programmable, simplifying the optimization of efficiency and burst mode operation. Disable burst mode through the pin configuration. UCC25640x uses hybrid hysteretic control to provide best in class line and load transient response.

UCC25640x includes a range of features designed to make LLC converter operation well controlled and protected. Use UCC25640x with UCC28056 or UCC28064A PFC controllers, along with a UCC24624 synchronous rectifier controller to offer a complete power supply option.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet UCC25640x LLC Resonant Controller with Ultra-Low Audible Noise and Standby Power PDF | HTML Aug 11, 2026
Application note Most Frequently Asked Questions About the UCC25640x LLC Resonant Controller PDF | HTML Jun 5, 2023
Application note UCC25640x LLC Resonant Controller Features Brief Overview and Bring up Guideline PDF | HTML Jun 20, 2022
Application note Improving Transient Response in LLC Converters Using Hybrid Hysteretic Control (Rev. B) Apr 7, 2021
Technical article How to reduce audible noise and power consumption at standby in your AC/DC design PDF | HTML Apr 22, 2020
Application note Migrating to UCC25640x from UCC25630x (Rev. A) Dec 10, 2019
Application note Improving ZVS and efficiency in LLC converters Nov 5, 2018

Design & development

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

Evaluation board

PFCLLCSREVM034 — AC to isolated DC EVM with UCC28056B, UCC256404 and UCC24624

PFCLLCSREVM034 is a 168-W AC/DC supply with a transition-mode power-factor-correction front end and isolated half-bridge LLC resonant converter with synchronous rectification. This EVM accepts AC input from 90 Vrms to 264 Vrms and outputs 12-V DC with 168-W full-load output power.

User guide: PDF
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Evaluation board

UCC25640EVM-020 — UCC25640x half bridge LLC evaluation module

UCC25640EVM-020 is a 180W, LLC resonant converter using UCC256404. This EVM accepts DC input from 360V to 410V, AC input voltage from 85VAC to 264VAC and outputs 12VDC with 180W full load output power.
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Simulation model

UCC25640x Simplis Model

SLUM684.ZIP (178 KB) - SIMPLIS model
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Calculation tool

SLUC675 — UCC25640x Design Calculator

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Reference design

PMP22083 — Single-stage AC/DC LCC resonant converter reference design

This reference design provides up to 265-W constant voltage and constant current output from a 120-VAC input with a single-stage LCC resonant converter stage. The BOM-cost of this design is highly optimized with the single-stage structure and use of the driver-integrated LLC resonant controller (...)
Supported products & hardware
Reference design

PMP40766 — Universal input, 500-W CC/CV e-Bike charger reference design

This reference design is a universal input, 71.4-V, 7-A constant current, constant voltage (CC/CV) charger for e-bike applications. The UCC28180 device is used for CCM PFC stage for 0.99 power factor and low-current total harmonic distortion. The UCC256403 is used for a half-bridge resonant (...)
Supported products & hardware
Reference design

TIDA-010080 — 500-W, >94.5% efficiency analog control AC/DC reference design for 5G telecom rectifier

This compact, high efficiency reference design with a 48-V DC, 500-W output targets 5G telecom power and industrial AC/DC power supplies. The circuit consists of a front-end continuous conduction mode (CCM) power factor correction (PFC) circuit based on the UCC28180, followed by a robust LLC stage (...)
Supported products & hardware
Reference design

TIDA-010081 — >95% Efficiency, 1-kW analog control AC/DC reference design for 5G telecom rectifier

This compact, high efficiency reference design with a 54-V DC, 1000-W output targets 5G telecom power and industrial AC/DC power supplies. The circuit consists of a front-end continuous conduction mode (CCM) power factor correction (PFC) circuit based on the UCC28180, followed by a robust LLC (...)
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SOIC (DDB) 14 Ultra Librarian
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