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UCC256403
LLC resonant controller with ultra-low power and ultra-quiet standby operation
Data sheet
UCC256403
- 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 7 | 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 | PDF | HTML | 22 Apr 2020 | |
| Application note | Migrating to UCC25640x from UCC25630x (Rev. A) | 10 Dec 2019 | ||
| Application note | Improving ZVS and efficiency in LLC converters | 05 Nov 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
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
Reference designs
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 (...)
Reference designs
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 (...)
Reference designs
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 (...)
Reference designs
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 (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOIC (DDB) | 14 | Ultra Librarian |
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