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UCC256402
LLC resonant controller with ultra-low standby power and high voltage startup
Data sheet
UCC256402
- 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 0.6 A source and 1.2 A sink capability
- Robust capacitive region (ZCS) avoidance scheme
- Over temperature, output over voltage, input under voltage protection, three levels of over current 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. It has been 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. Burst mode can also be disabled through 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. It can be used with UCC28056 or UCC28064A PFC controllers, along with UCC24624 synchronous rectifier controller to offer a complete power supply solution.
Technical documentation
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View all 6 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCC25640x LLC Resonant Controller with Ultra-Low Audible Noise and Standby Power datasheet (Rev. E) | PDF | HTML | 19 Feb 2021 |
| Application note | Most Frequently Asked Questions About the UCC25640x LLC Resonant Controller | PDF | HTML | 05 Jun 2023 | |
| Application note | UCC25640x LLC Resonant Controller Features Brief Overview and Bring up Guideline | PDF | HTML | 20 Jun 2022 | |
| Application note | Improving Transient Response in LLC Converters Using Hybrid Hysteretic Control (Rev. B) | 07 Apr 2021 | ||
| Technical article | How to reduce audible noise and power consumption at standby in your AC/DC design | 22 Apr 2020 | ||
| Application note | Migrating to UCC25640x from UCC25630x (Rev. A) | 10 Dec 2019 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
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.
User guide: PDF
| Package | Pins | Download |
|---|---|---|
| SOIC (DDB) | 14 | View options |
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