UCC28720
- < 10-mW No-Load Power
- Primary-Side Regulation (PSR) Eliminates Opto-
Coupler - ±5% Voltage and Current Regulation Across Line
and Load - 700-V Start-Up Switch
- 80-kHz Maximum Switching Frequency Enables
High-Power Density Charger Designs - Quasi-Resonant Valley-Switching Operation for
Highest Overall Efficiency - Wide VDD Range Allows Small Bias Capacitor
- Dynamic BJT Drive
- Overvoltage, Low-Line, and Overcurrent
Protection Functions - Programmable Cable Compensation
- SOIC-7 Package
The UCC28720 flyback power supply controller provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.
An internal 700-V start-up switch, dynamically-controlled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response.
Control algorithms in the UCC28720 allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a bipolar transistor 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. Protection features help keep primary and secondary component stresses in check. The UCC28720 allows compensation for voltage drop in the cable to be programmed with an external resistor.
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 | UCC28720 Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. B) | PDF | HTML | 2015/9/30 | ||
| 應用說明 | Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips | PDF | HTML | 2021/8/31 | |||
| 應用說明 | Minimize Standby Consumption for UCC287XX Family | 2019/8/1 | ||||
| 應用說明 | Maximum Output Power and Thermal Considerations for UCC28720 and UCC28722 | 2017/12/6 | ||||
| 應用說明 | Troubleshooting TI PSR controllers | 2016/10/3 | ||||
| 技術文章 | Slim down your flyback; lose that excess snubber | PDF | HTML | 2016/2/15 | |||
| 白皮書 | Control Challenges for Low Power AC/DC Converters | 2015/10/2 | ||||
| 白皮書 | Control Challenges for Low Power AC/DC Converters (PPT) | 2015/10/2 | ||||
| 技術文章 | Designing multiple output converters with primary side sensing | PDF | HTML | 2015/8/4 | |||
| 應用說明 | 5-W USB Flyback Design Example Using the UCC28722 | 2014/1/8 |
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)。
UCC28720EVM-212 — 適用於 USB 離線適配器的 UCC28720EVM-212 5W 評估模組
PMP9622 — 350W 恆壓 - 定電流 (CVCC) 相移全橋參考設計
此參考設計使用 UCC3895 相移全橋控制器，以實作高效率的 120VAC 輸入至 44Vdc，最高可達 8A 輸出。 電源供應設定為恆定電壓恆定電流。 電壓和電流由固定電阻值設定，可由實際產品中的微處理器設定。 此設計採用 UCC28720 PWM 控制器的低成本 BJT 返馳提供偏壓電源。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOIC (D) | 7 | 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。