Calculation tool
UCC25660X-CALC — UCC25660X 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 UCC25660x controller.
Data sheet
UCC25660
- 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 (UCC256601, UCC256602, and UCC256604)
- X-capacitor discharge (UCC256601 and UCC256604).
- 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 UCC25660x 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 UCC25660x family’s enhanced light-load management improves while minimizing audible noise. To minimize standby power, the UCC25660x 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 FET’s. This scheme makes the controller ideal for working with a pre-biased load.
The UCC25660x family comes with robust protection to help you design a reliable power supply. The UCC25660x 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
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View all 9 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCC25660x Family 750kHz Wide VIN /VOUT Range LLC Controller Optimized for Light-Load Efficiency datasheet (Rev. B) | PDF | HTML | 08 Jul 2024 |
| Product overview | UCC25660x Selection Guide (Rev. A) | PDF | HTML | 30 May 2024 | |
| Certificate | CB TEST CERTIFICATE US-43600-UL | 28 Mar 2024 | ||
| Certificate | CB TEST CERTIFICATE US-43601-UL | 28 Mar 2024 | ||
| Technical article | LLC 시리즈 공진 컨버터 상자를 벗어나 생각하기 | PDF | HTML | 22 Mar 2024 | |
| Technical article | 跳出 LLC 串聯諧振轉換器的思維框架 | PDF | HTML | 20 Mar 2024 | |
| Technical article | Think outside the LLC series resonant converter box | PDF | HTML | 22 Feb 2024 | |
| Certificate | UCC25660EVM-064 EU Declaration of Conformity (DoC) | 12 Jun 2023 | ||
| 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
UCC25660EVM-064 — UCC25660 evaluation module
The UCC25660EVM-064 assists designers to evaluate the operation and performance of the UCC25660 LLC resonant controller. This evaluation module (EVM) demonstrates how UCC25660 controls the LLC resonant half-bridge DC/DC converter to achieve high efficiency throughout the load and input voltage (...)
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
Reference designs
PMP23463 — 300W thin profile LLC reference design
This reference design demonstrates a half-bridge resonant converter on a single copper layer printed circuit board (PCB) that accepts a 385V input and generates an isolated 22.5V output up to 13.5A load. This design is comprised of the UCC256603 half-bridge LLC controller and UCC24612 synchronous (...)
Test report: PDF
Reference designs
PMP41106 — Universal input, 500W constant current and constant voltage E-bike charger reference design
This reference design is a universal input, 48V, 10.4A constant current (CC), constant voltage (CV) charger for e-bike applications. The reference design achieves 91.5% end-to-end peak efficiency with a 110Vac input, and 93.50% end-to-end peak efficiency with a 230Vac input. This design includes (...)
Test report: PDF
Reference designs
PMP23464 — Universal input, 500W constant current and constant voltage e-bike charger reference design
This reference design is a universal input, 71.4V, 7A constant current (CC), constant voltage (CV) charger for e-bike applications. The reference design achieves 92.93% end-to-end peak efficiency with a 115Vac input, and 94.50% end-to-end peak efficiency with a 230Vac input. This design includes (...)
Test report: PDF
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOIC (DDB) | 14 | Ultra Librarian |
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