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UCC25661

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Wide VIN and VOUT 750KHz LLC controller with high-voltage startup

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Data sheet

UCC25661

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Half bridge, Half-bridge, LLC, LLC half-bridge Vin (max) (V) 18.5 Vin (min) (V) 9 Control mode Current Features Extended power range, High frequency, High-voltage startup, Light load efficiency, Low audible noise, Overcurrent protection, Overtemperature protection, Overvoltage protection, PFC ON/OFF signal, Secondary-side regulated, Soft-start, Wide Input, Wide VIN, Wide VOUT, Wide input voltage, Zero voltage switching Operating temperature range (°C) -40 to 125
Rating Catalog Topology Half bridge, Half-bridge, LLC, LLC half-bridge Vin (max) (V) 18.5 Vin (min) (V) 9 Control mode Current Features Extended power range, High frequency, High-voltage startup, Light load efficiency, Low audible noise, Overcurrent protection, Overtemperature protection, Overvoltage protection, PFC ON/OFF signal, Secondary-side regulated, Soft-start, Wide Input, Wide VIN, Wide VOUT, Wide input voltage, Zero voltage switching Operating temperature range (°C) -40 to 125
SOIC (DDB) 14 59.4 mm² 9.9 x 6
  • Full-load switching frequency: 50kHz to 750kHz
  • Input Power Proportional Control (IPPC) for wide LLC
  • Enhanced light load management (standby power and audible noise):
    • High frequency and audible frequency pulse skip
    • Low frequency burst (all except UCC256616)
    • Integrated PFC on/off (UCC256614)
    • Soft in and out of burst mode (UCC256610)
  • Internal resonant-capacitor voltage synthesizer for signal reliability and high frequency start-up
  • Zero current switching (ZCS) avoidance to eliminate capacitive region operation
  • Adaptive soft start with minimized inrush current and eliminating reverse recovery at start-up
  • Integrated gate drive: +0.6/-1.2A
  • Integrated high-voltage start-up (UCC25661x family except UCC256613)
  • X-capacitor discharge (UCC256610, UCC256611, and UCC256614)
  • Extended Gain Range (UCC256611 and UCC256614)
  • 50ns overcurrent protection (OCP), cycle-by-cycle current limit
  • Overvoltage protection (OVP), OVP latch (UCC256611 and UCC256616)
  • Internal and external OTP
  • Input and VCCP UVLO with internal 19V VCCP Clamp
  • Independently configured OCP and overload protection (OLP/OPP) (UCC25661x family except UCC256616)
  • SOIC-14 package with removed pins for high-voltage clearance
  • Full-load switching frequency: 50kHz to 750kHz
  • Input Power Proportional Control (IPPC) for wide LLC
  • Enhanced light load management (standby power and audible noise):
    • High frequency and audible frequency pulse skip
    • Low frequency burst (all except UCC256616)
    • Integrated PFC on/off (UCC256614)
    • Soft in and out of burst mode (UCC256610)
  • Internal resonant-capacitor voltage synthesizer for signal reliability and high frequency start-up
  • Zero current switching (ZCS) avoidance to eliminate capacitive region operation
  • Adaptive soft start with minimized inrush current and eliminating reverse recovery at start-up
  • Integrated gate drive: +0.6/-1.2A
  • Integrated high-voltage start-up (UCC25661x family except UCC256613)
  • X-capacitor discharge (UCC256610, UCC256611, and UCC256614)
  • Extended Gain Range (UCC256611 and UCC256614)
  • 50ns overcurrent protection (OCP), cycle-by-cycle current limit
  • Overvoltage protection (OVP), OVP latch (UCC256611 and UCC256616)
  • Internal and external OTP
  • Input and VCCP UVLO with internal 19V VCCP Clamp
  • Independently configured OCP and overload protection (OLP/OPP) (UCC25661x family except UCC256616)
  • SOIC-14 package with removed pins for high-voltage clearance

The UCC25661x family is a high-frequency LLC controller implementing input-power proportional control (IPPC) scheme, along with enhanced light-load management and multiple protection features. IPPC widens the control range of the LLC converter and simplifies the design of wide input or output-voltage range applications such as LED drivers and battery chargers. IPPC works without a PFC for non-universal input applications.

The UCC25661x family has enhanced light-load management that improves the efficiency while minimizing audible noise. To minimize standby power, the UCC25661x family directly disables the PFC controller when operating in burst mode.

The automatic capacitive region avoidance scheme along with the adaptive soft start with reverse recovery avoidance scheme verifies that the device never works in a mode where there is a potential to damage the FETs. The automatic capacitive region avoidance scheme makes the controller appropriate for working with a prebiased load.

The UCC25661x family comes with robust protection to help users design a reliable power supply. The UCC25661x family has options supporting high-voltage start-up, X-capacitor (X-cap) discharge, OVP, and extended gain range (EGR). See details in the Device Comparison table.

The UCC25661x family is a high-frequency LLC controller implementing input-power proportional control (IPPC) scheme, along with enhanced light-load management and multiple protection features. IPPC widens the control range of the LLC converter and simplifies the design of wide input or output-voltage range applications such as LED drivers and battery chargers. IPPC works without a PFC for non-universal input applications.

The UCC25661x family has enhanced light-load management that improves the efficiency while minimizing audible noise. To minimize standby power, the UCC25661x family directly disables the PFC controller when operating in burst mode.

The automatic capacitive region avoidance scheme along with the adaptive soft start with reverse recovery avoidance scheme verifies that the device never works in a mode where there is a potential to damage the FETs. The automatic capacitive region avoidance scheme makes the controller appropriate for working with a prebiased load.

The UCC25661x family comes with robust protection to help users design a reliable power supply. The UCC25661x family has options supporting high-voltage start-up, X-capacitor (X-cap) discharge, OVP, and extended gain range (EGR). See details in the Device Comparison table.
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Technical documentation

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Type Title Date
* Data sheet UCC25661x Family 750kHz Wide VIN /VOUT Range LLC Controller Optimized for Light-Load Efficiency datasheet (Rev. B) PDF | HTML 21 Jan 2026
White paper High Efficiency by Leveraging GaN FET in an LLC Resonant Converter Design PDF | HTML 24 Sep 2025
Product overview UCC25661(-Q1) Selection Guide PDF | HTML 04 Sep 2025
Technical article LLC 토폴로지를 이용해 자동차 설계자가 전력 밀도와 안정성을 강화 하도록 지원 PDF | HTML 19 May 2025
Technical article 幫助汽車設計師藉由 LLC 拓撲結構提升功率密度與系統可靠性 PDF | HTML 19 May 2025
Technical article Enabling automotive designers to increase power-density and reliability with LLC topology PDF | HTML 02 May 2025

Design & development

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

Evaluation board

UCC25661EVM-128 — UCC25661 evaluation module

The UCC25661 evaluation module (EVM) assists designers to evaluate the operation and performance of the UCC25661x LLC Resonant controller (16-pin SOIC package with removed pins for high voltage clearance). This evaluation module demonstrates how UCC25661x controls the LLC resonant half bridge DC-DC (...)

User guide: PDF | HTML
Not available on TI.com
Calculation tool

UCC25661X-CALC — UCC25661X Design Calculator

The purpose of this tool is to aid in the design of the main power stage components of a LLC Resonant Converter along with component calculations using UCC25661x controller.
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
  • UCC25661 — Wide VIN and VOUT 750KHz LLC controller with high-voltage startup
  • UCC25661-Q1 — Automotive, high density, Wide VIN and VOUT LLC controller with IPPC
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Reference designs

PMP23558 — 240W AC/DC PSU Using GaN reference design

This reference design is a transition-mode, boost power factor correction (PFC) and half bridge LLC that accepts universal AC input and generates an isolated 24V, 10A output. The design utilizes LMG3622 GaN module on the primary side with integrated driver and current sense emulation for improved (...)
Test report: PDF
Reference designs

PMP23454 — Universal input, 430W power tool charger reference design

This reference design is a universal input, 430W constant current (CC), constant voltage (CV) charger for power tool applications. The reference design supports output voltage ranges of 0V to 12.5V in trickle-charge mode and 7.5V to 22.5V in fullcharge mode. The power factor correction (PFC) is (...)
Test report: PDF
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SOIC (DDB) 14 Ultra Librarian
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