UCC28702
- < 30-mW No-Load Power for 5-Star Rating
- Primary-Side Regulation (PSR) Eliminates Opto-Coupler
- ±5% Voltage and Current Regulation
- 130-kHz Maximum Switching Frequency Enables High-Power
Density Charger Designs - Quasi-Resonant Valley-Switching Operation for Highest
Overall Efficiency - Patent-Pending Frequency-Jitter Scheme to Ease EMI
Compliance - Wide VDD Range Allows Small Bias Capacitor
- Clamped Gate-Drive Output for MOSFET
- Protection Functions: Overvoltage, Low-Line, and
Overcurrent - Programmable Cable Compensation (UCC28700 Only)
- NTC Resistor Interface (UCC28701, UCC28702 and UCC28703
Only) With Fixed Cable Compensation Options - SOT-23 Package
The UCC28700 family of flyback power supply controllers provides 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. Low start-up current, dynamically controlled operating states and a tailored modulation profile support very low standby power without sacrificing start-up time or output transient response.
Control algorithms in the UCC28700 family allow operating efficiencies to meet or exceed applicable standards. The output drive 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 controllers have a maximum switching frequency of 130 kHz and always maintain control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28700 allows the level of cable compensation to be programmed. The UCC28701, UCC28702, and UCC28703 devices allow remote temperature sensing using a Negative Temperature Coefficient (NTC) resistor while providing fixed cable-compensation levels.
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 | UCC2870x Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. A) | PDF | HTML | 2014/12/12 | ||
| 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 | Selecting Electrolitic Bus Capacitor for Universal Input | 2018/7/17 | ||||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 | ||||
| 應用說明 | Troubleshooting TI PSR controllers | 2016/10/3 | ||||
| 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 | ||||
| 應用說明 | UCC28700 5-W USB Flyback Design Review (Rev. C) | 2014/2/21 | ||||
| 更多文件說明 | Exposing the Inner Behavior of a Quasi-Resonant Flyback Converter | 2013/10/29 |
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)。
UCC28700EVM-068 — UCC28700 評估模組
SLUC381 — MathCAD Design Tool
SLUC408 — UCC28700 Excel 97 Design Tool
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |