UCC2893
- Low Output Jitter
- Soft-Stop Shutdown of MAIN and AUX
- Ideal for Active Clamp/Reset Forward, Flyback Converters
- Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches
- Peak Current-Mode Control with Cycle-by-Cycle Current Limiting
- 110-V Input Startup Regulator on UCC2891/3
- TrueDrive™ 2-A Sink, 2-A Source Outputs
- Accurate Line UV and Line OV Threshold
- Programmable Slope Compensation
- 1.0-MHz Synchronizable Oscillator
- Precise Programmable Maximum Duty Cycle
- Programmable Soft Start
- APPLICATIONS
- 150-W to 700-W SMPS
- High-Efficiency, Low EMI/RFI Off-Line or DC/DC Converters
- Server, 48-V Telecom, Datacom
- High Power Adapter, LCD-TV and PDP-TV
The UCC2891/2/3/4 family of PWM controllers is designed to simplify implementation of the various active clamp/reset switching power topologies.
The UCC289x is a peak current-mode, fixedfrequency, high-performance pulse width modulator. It includes the logic and the drive capability for the auxiliary switch with a simple method of programming the critical delays for proper active clamp operation.
The UCC2891/3 includes a 110-V start-up regulator for initial start-up and to provide keep-alive power during stand-by.
Additional features include an internal programmable slope compensation circuit, precise DMAX limit, and a single resistor programmable synchronizable oscillator. An accurate line monitoring function also programs the converter\x92s ON and OFF transitions with regard to the bulk input voltage. Along with the UCC2897, this UCC289x family allows the power supply designer to eliminate many of the external components, reducing the size and complexity of the design.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | UCC289x Current Mode Active Clamp PWM Controller datasheet (Rev. F) | 2009/7/1 | |||
| 應用說明 | Understanding and Designing an Active Clamp Current Mode Controlled Converter (Rev. A) | 2020/1/27 | ||||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 | ||||
| 應用說明 | Method of Providing Hiccup Operation for UCC2897AEVM | 2009/8/27 | ||||
| 應用說明 | UCC2891 Active Clamp | 2003/12/22 | ||||
| 更多文件說明 | Seminar 1100 Topic 3 - Design Considerations for Active Clamp and Reset | 2001/2/15 | ||||
| 更多文件說明 | Seminar 1000 Topic 3 - Active Clamp and Reset Technique | 2001/2/15 |
設計與開發
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| TSSOP (PW) | 16 | Ultra Librarian |
| SOIC (D) | 16 | Ultra Librarian |
訂購與品質
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