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.
Data sheet
UCC25661
- 50kHz to 750kHz full-load switching frequency
- IPPC control enables wide input and output LLC (WLLC) operation
- Enhanced light load management:
- High frequency pulse skip for improved light load efficiency
- Low frequency burst for low standby power
- Audible frequency range skip for reduced audible noise
- Integrated PFC on/off control signal to help further reduce standby power
- Internal resonant-capacitor voltage synthesizer for enhanced signal reliability and high startup frequency support
- Automatic capacitive region avoidance
- Adaptive soft start with minimized inrush current
- Integrated high-voltage startup (UCC256610, UCC256611, UCC256612, and UCC256614)
- X-capacitor discharge (UCC256610, UCC256611 and UCC256614).
- Integrated +0.6/-1.2A gate drive
- Complete protections
- 50ns Over-Current Protection (OCP) - cycle-by-cycle current limit
- Over-Voltage Protection (OVP), internal and external Over-Temperature Protection (OTP)
- Input and VCCP UVLO with internal 19V VCCP Clamp
- 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 an enhanced light-load management and multiple protection features.
IPPC widens the control range of the LLC converter simplifies the design of wide input and output-voltage range applications such as LED drivers, battery chargers. It can even work 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 can directly disable 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 ensures that the device can never work in a mode where there is a potential to damage the FETs. This scheme makes the controller ideal for working with a pre-biased load.
The UCC25661x family comes with robust protection to help you design a reliable power supply. The UCC25661x family has options supporting high-voltage startup, X-capacitor (X-cap) discharge, OVP response, and extended Gain range. See details in the Device Comparison Table.
Technical documentation
No results found. Please clear your search and try again.
View all 5 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCC25661x Family 750kHz Wide VIN /VOUT Range LLC Controller Optimized for Light-Load Efficiency datasheet | PDF | HTML | 09 May 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 | |
| EVM User's guide | UCC25661x Half Bridge LLC Evaluation Module | PDF | HTML | 08 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 (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOIC (DDB) | 14 | Ultra Librarian |
Ordering & quality
Information included:
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Information included:
- Fab location
- Assembly location
Support & training
TI E2E™ forums with technical support from TI engineers
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.