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-Q1
- 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 (UCC256612-Q1, and UCC256614-Q1)
- Integrated +0.6A and –1.2A gate drive
- Complete protections
- 50ns overcurrent protection (OCP); cycle-by-cycle current limit
- Overvoltage protection (OVP), internal and external overtemperature protection (OTP)
- Input and VCCP UVLO with internal 19V VCCP Clamp
- SOIC-14 package with removed pins for high-voltage clearance
The UCC25661x-Q1 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 and simplifies the design of wide input applications such as high voltage to low voltage (HV-LV) redundant auxiliary, key-off, or bias isolated power supplies. IPPC also simplifies the design of wide output applications such as light electric vehicle battery chargers (scooters, mopeds, golf carts, and fork lifts).
The UCC25661x-Q1 family has enhanced light-load management that improves the efficiency while minimizing audible noise. To minimize standby power in charger applications, the UCC25661x-Q1 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-Q1 family comes with robust protection to help you design a reliable power supply. The UCC25661x-Q1 family has options supporting high-voltage startup (HVSU) and extended gain range (EGR). See details in the Device Comparison Table.
Technical documentation
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View all 2 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCC25661x-Q1 Family 750kHz Wide VIN /VOUT Range LLC Controller Optimized for Light-Load Efficiency datasheet | PDF | HTML | 02 May 2025 |
| Technical article | Enabling automotive designers to increase power-density and reliability with LLC topology | PDF | HTML | 02 May 2025 |
Design & development
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Reference designs
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOIC (DDB) | 14 | Ultra Librarian |
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