UCC2897A
- Low-output jitter
- Soft-stop shutdown of MAIN and AUX
- 110-V input startup function
- Ideal for active-clamp, reset-forward, flyback and synchronous rectifier uses
- Provides complementary auxiliary driver with programmable dead time (Turn-On Delay) between AUX and MAIN switches
- Peak current-mode control with 0.5-V cycle-by-cycle current limiting
- TrueDrive™ 2-A Sink, 2-A source outputs
- Trimmed internal-bandgap reference for accurate line UV and line OV threshold
- Programmable slope compensation
- High-performance 1-MHz synchronizable oscillator with internal timing capacitor
- Precise programmable maximum duty cycle
- PB-free lead finish package
The UCC2897A PWM controller simplifies implementation of the various active clamp or reset and synchronous rectifier switching power topologies.
The UCC2897A is a peak current-mode fixed-frequency high-performance pulse-width modulator. The controller includes the logic and the drive capability for the P-channel auxiliary switch along with a simple method of programming the critical delays for proper active-clamp operation.
Features include an internal programmable slope compensation circuit, precise DMAX limit, and a synchronizable oscillator with an internal-timing capacitor. An accurate line-monitoring function also programs the ON and OFF transitions of the converter with regard to the bulk input voltage, VIN.
The UCC2897A adds a second-level hiccup-mode current-sense threshold, bi-directional synchronization and input-overvoltage protection functionalities. The UCC2897A is offered in 20-pin TSSOP (PW) and 20-pin QFN (RGP) packages.
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 | UCC2897A Advanced Current-Mode Active-Clamp PWM Controller datasheet (Rev. G) | PDF | HTML | 2019/1/27 | ||
| 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 | Slope Compensation Design for UCC2897A | 2017/10/30 | ||||
| 技術文章 | Flyback converters: two outputs are better than one | PDF | HTML | 2016/11/24 | |||
| 技術文章 | Excuse me for being a little forward... with my topology | PDF | HTML | 2015/10/21 | |||
| 應用說明 | UCC2897A Peak Current Mode Active Clamp Forward Converter Small Signal Modeling | 2014/1/17 | ||||
| 應用說明 | External Slope Compensation for UCC2897A in Some Special Applications | 2010/1/5 | ||||
| 應用說明 | Method of Providing Hiccup Operation for UCC2897AEVM | 2009/8/27 | ||||
| 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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TPS2372-4EVM-006 — 適合 IEEE802.3bt PoE PD 應用的 TPS2372-4EVM 評估模組
TPS2372 評估模組 (TPS2372-4EVM-006) 包含 TPS2372 的評估與參考電路，是適用於高功率 PoE PD 應用（例如 LED 照明和模組）的 IEEE802.3bt PoE PD 控制器。
需要支援 IEEE802.3bt 的 PSE 控制器嗎？進一步瞭解 TPS23880。
TPS2373-4EVM-758 — 適合 IEEE802.3bt PoE PD 應用的 TPS2373-4 評估模組
TPS2373 評估模組 (TPS2373-4EVM-758) 包含 TPS2373 的評估與參考電路，是適用於高功率 PoE PD 應用的 IEEE802.3bt PoE PD 控制器。此 EVM 採用 5V 主動箝位順向隔離式轉換器設計，可實現高效率 70W PD 解決方案。
需要支援 IEEE802.3bt 的 PSE 控制器嗎？進一步瞭解 TPS23880。
UCC2897AEVM — UCC2897A 評估模組
UCC2897A 評估模組 (EVM) 是一款主動箝位重設順向式轉換器，可在 30 A 負載電流下提供 3.3-V 穩壓輸出，並可在 48-V 輸入下運作。此設計可在完整 36-V 至 72-V 電信輸入範圍內運作，並可完全調節至零負載電流。該模組使用 UCC2897A 電流模式主動箝位 PWM 控制器，可有效展示主動箝位變壓器重設技術。
SLUC662 — UCC2897A Design Calculator
許多 TI 參考設計包含 UCC2897A
使用我們的參考設計選擇工具，以檢視並找出最適合您的應用和參數的設計。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| TSSOP (PW) | 20 | Ultra Librarian |
| VQFN (RGP) | 20 | Ultra Librarian |
訂購與品質
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