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UCC256303
LLC resonant controller enabling low standby power
Data sheet
Although this product continues to be in production to support previous designs, we don't recommend it for new designs. Consider one of these alternates:
Pin-for-pin with same functionality to the compared device
UCC256303
- Hybrid Hysteretic Control (HHC)
- Best-in-Class Transient Response
- Easy Compensation Design
- Optimized Low Power Features Enable 75 mW
Standby Power Design with PFC on- Advanced Burst Mode
Opto-Coupler Low Power Operation - Helps Enable Compliance to CoC Tier II Standard
- Advanced Burst Mode
- Fast Exit from Burst Mode
- Improved Capacitive Region Avoidance Scheme
- Adaptive Dead-Time
- Internal High-Side Gate Drivers
(0.6-A and 1.2-A Capability) - Robust Soft Start with No Hard Switching
- Over Temperature, Output Over Voltage, Input
Over and Under Voltage Protection with
Three Levels of Over Current Protections - Wide Operating Frequency Range
(35 kHz to 1 MHz) - LLC Resonant Controller in SOIC16
with High Voltage Clearance - External Bias Required
- Create a Custom Design Using the UCC256303 With the WEBENCH® Power Designer
The UCC256303 is a fully featured LLC controller with integrated high-voltage gate driver. It has been designed to pair with a PFC stage 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, and with PFC stage running all the time. UCC256303 includes a range of features designed to make LLC converter operation well controlled and robust. This device aims to unburden the LLC designer and allow mainstream applications to benefit from efficiency advantages of the LLC topology.
UCC256303 uses hybrid hysteretic control to provide best in class line and load transient response. The control effort is approximately linearly proportional to average input current in one cycle. The control makes the open loop transfer function a first order system so that it’s very easy to compensate. The system is always stable with proper frequency compensation.
UCC256303 provides a high efficient burst mode with consistent burst power level during each burst on cycle. The burst power level is programmable and adaptively changes with input voltage, making the optimization of efficiency very easy.
Technical documentation
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View all 9 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCC256303 LLC Resonant Controller Enabling Ultra-Low Standby Power datasheet (Rev. A) | PDF | HTML | 07 Jan 2019 |
| Application note | Improving Transient Response in LLC Converters Using Hybrid Hysteretic Control (Rev. B) | 07 Apr 2021 | ||
| Application note | Migrating to UCC25640x from UCC25630x (Rev. A) | 10 Dec 2019 | ||
| Application note | Exceeding Modern Energy Standards with 'Always On' PFC and LLC Controllers (Rev. B) | 01 Aug 2019 | ||
| Application note | Improving ZVS and efficiency in LLC converters | 05 Nov 2018 | ||
| EVM User's guide | Using UCC25630-1EVM-291 (Rev. B) | 30 Jan 2018 | ||
| Application note | UCC25630x Practical Design Guidelines (Rev. A) | 08 Dec 2017 | ||
| Application note | AC Ripple Rejection in AC/DC Systems Using LLC | 31 Oct 2017 | ||
| Selection guide | UCC25630x Selection Guide | 29 Aug 2017 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
UCC25630-1EVM-291 — UCC256301 LLC evaluation module
UCC25630-1EVM-291 is an EVM of LLC resonant half-bridge DC-DC power converter with LLC controller UCC256301. UCC25630-1EVM-291 accepts DC line input from 340Vdc to 410Vdc, AC input voltage from 85 VAC to 264 VAC, and outputs nominal 12Vdc with full load output power 120W, or full output current 10A.
User guide: PDF
Reference designs
PMP40281 — LLC Resonant Converter Control Card Reference Design
This reference design is a a control card for LLC converter. It integrates all of the essential functions for controlling a LLC converter including the HV start-up, X-capacitor discharge and the drivers for the power FETs. By employing the advanced burst mode, it can also help the LLC converter to (...)
| Package | Pins | Download |
|---|---|---|
| SOIC (DDB) | 14 | View options |
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