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
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | UCC28742 High-Efficiency Flyback Controller with Optocoupler Feedback datasheet (Rev. A) | PDF | HTML | 2018年 5月 8日 |
| Technical article | 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 | 2024年 3月 20日 | |
| Technical article | 緩衝返馳式轉換器 | PDF | HTML | 2024年 3月 20日 | |
| Application brief | Flyback Selection Guide | PDF | HTML | 2022年 6月 23日 | |
| Application note | Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips | PDF | HTML | 2021年 8月 31日 | |
| More literature | PCB layout guidelines to optimize power supply performance | 2021年 3月 23日 | ||
| Application note | Minimize Standby Consumption for UCC287XX Family | 2019年 8月 1日 | ||
| Technical article | Choosing the right flyback controller for your design | PDF | HTML | 2018年 8月 24日 | |
| Application note | Selecting Electrolitic Bus Capacitor for Universal Input | 2018年 7月 17日 | ||
| EVM User's guide | Using the UCC28742EVM-001 (Rev. B) | 2018年 6月 6日 |
設計與開發
如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。
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。
| 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
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點