Overview
The UCC256304, produced by Texas Instruments, is a highly integrated ultra-wide VIN LLC (LLC - Line Load Control) resonant controller designed to enable low standby power and high efficiency in power supply systems. This controller is optimized for use in applications requiring high power density and stringent standby power requirements. It features a hybrid hysteretic control (HHC) algorithm, which provides best-in-class transient response and simplifies compensation design. The UCC256304 is capable of operating over a wide DC input range and supports a wide AC input range without the need for PFC startup, making it versatile for various power supply designs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 0.5 | 0.6 | 0.7 | V |
| Input Voltage Start (VBLKStart) | 1.01 | 1.04 | 1.08 | V |
| Input Voltage Stop (VBLKStop) | 0.83 | 0.87 | 0.93 | V |
| Operating Frequency Range | 35 kHz | - | 1 MHz | - |
| Thermal Shutdown Temperature (TJ_r) | 125 | - | 145 | °C |
| Package Type | - | - | SOIC (14-pin) | - |
| Body Size | - | - | 9.9 mm x 3.9 mm | - |
Key Features
- Hybrid Hysteretic Control (HHC): Provides best-in-class transient response and simplifies compensation design.
- Optimized Low Power Features: Enables 75 mW standby power design with PFC on and supports CoC Tier II standard.
- Advanced Burst Mode: Programmable burst mode with consistent burst power level, adaptively changing with input voltage.
- Internal High-Side Gate Drivers: Capable of driving up to 1.2 A.
- Robust Soft Start: No hard switching, ensuring smooth startup.
- Protection Features: Over temperature, output over voltage, input over and under voltage, and three levels of over current protections.
- Adaptive Dead-Time: Automatically adjusts dead-time for optimum efficiency and security.
- Capacitive Region Avoidance Scheme: Prevents operation in the capacitive region, ensuring efficient operation.
- Nemko Certification for X Cap Discharge Function: Ensures safe and compliant operation.
Applications
- Digital TV SMPS
- AC-DC Adapters
- Multi-Functional Printers
- Projectors
- Merchant DC-to-DC
- High Power Battery Charging
- DIN Rail Power Supply
- Multi-Axis Servo
- ATX Power Supply
- Appliances
- LED Lighting Applications
Q & A
- What is the primary function of the UCC256304?
The UCC256304 is a fully featured LLC controller designed to pair with a PFC stage to provide a complete power system with minimal external components.
- What is Hybrid Hysteretic Control (HHC) in the UCC256304?
HHC is a control algorithm that provides best-in-class transient response and simplifies compensation design by making the system a first-order system.
- What are the key benefits of the advanced burst mode in UCC256304?
The advanced burst mode enables low standby power, with a programmable burst power level that adaptively changes with input voltage, optimizing efficiency.
- What protection features are included in the UCC256304?
The UCC256304 includes over temperature, output over voltage, input over and under voltage, and three levels of over current protections.
- How does the UCC256304 handle capacitive region operation?
The UCC256304 includes a capacitive region avoidance scheme that prevents operation in the capacitive region, ensuring efficient operation.
- What is the significance of Nemko certification for X Cap Discharge Function in UCC256304?
Nemko certification ensures that the X Cap Discharge Function meets safety and compliance standards.
- What is the operating frequency range of the UCC256304?
The operating frequency range of the UCC256304 is from 35 kHz to 1 MHz.
- What package type and body size does the UCC256304 come in?
The UCC256304 comes in a SOIC (14-pin) package with a body size of 9.9 mm x 3.9 mm.
- How does the UCC256304 manage dead-time in gate signals?
The UCC256304 includes an algorithm for adaptive dead-time that automatically adjusts the dead-time for optimum efficiency and security.
- What are some typical applications of the UCC256304?
Typical applications include digital TV SMPS, AC-DC adapters, multi-functional printers, projectors, and LED lighting applications.
