UCC28742
- Opto-Coupled Feedback Enables up to 1% Regulation
- Accurate Current Limit with Overload Timeout Protection and Delayed Hiccup Response
- Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency
- 80-kHz Maximum Switching Frequency
- Frequency Dithering to Ease EMI Compliance
- Clamped Gate-Drive Output for MOSFET
- Ultra-Low Start-Up Current and Large VDD Hysteresis
- High Value Start-Up Resistor
- Low Bias Capacitance
- Fault Protections
- Input Low Line
- Output Over-Voltage
- Over-Current
- Short-Circuit
- SOT23-6 Package
- Create a Custom Design Using the UCC28742 with the WEBENCH® Power Designer
The UCC28742 off-line flyback controller is a highly integrated, 6-pin secondary-side regulated PWM controller for efficient AC-to-DC power supplies. It is an isolated-flyback power-supply controller that provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. This device processes information from opto-coupled feedback and an auxiliary flyback winding for high-performance control of output voltage and current.
The UCC28742 employs advanced control algorithms to achieve high operating efficiency and performance. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primary current-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.
The controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. A minimum switching frequency of 200 Hz facilitates the achievement of low no-load input power.
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 | UCC28742 High-Efficiency Flyback Controller with Optocoupler Feedback datasheet (Rev. A) | PDF | HTML | 2018/5/8 | ||
| 技術文章 | 新增單一電容器以增進雙輸出返馳電源供應器的交互穩壓 | PDF | HTML | Download English Version | PDF | HTML | 2024/3/20 | |
| 技術文章 | 緩衝返馳式轉換器 | PDF | HTML | Download English Version | PDF | HTML | 2024/3/20 | |
| Application brief | Flyback Selection Guide | PDF | HTML | 2022/6/23 | |||
| 應用說明 | Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips | PDF | HTML | 2021/8/31 | |||
| 更多文件說明 | PCB layout guidelines to optimize power supply performance | 2021/3/23 | ||||
| 應用說明 | Minimize Standby Consumption for UCC287XX Family | 2019/8/1 | ||||
| 技術文章 | Choosing the right flyback controller for your design | PDF | HTML | 2018/8/24 | |||
| 應用說明 | Selecting Electrolitic Bus Capacitor for Universal Input | 2018/7/17 |
設計與開發
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UCC28742EVM-001 — UCC28742 10W AC/DC 轉換器評估模組
UCC28742EVM-001 是一款 10W 評估模組，用於評估 USB 應用的離線變壓器。該 EVM 符合 CoC Tier 2 與 DoE Level 6 的效率及待機功耗要求。它旨在用於評估目的，而不是最終產品。UCC28742EVM-001 可將 85VRMS 至 265VRMS 輸入電壓轉換為 5VDC，具有 2.1A 電流限制，適用於 USB 變壓器應用。
SLUC652 — UCC28742 Design Calculator
許多 TI 參考設計包含 UCC28742
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 |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。