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.
技术文档
| 顶层文档 | 类型 | 标题 | 格式选项 | 下载最新的英语版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 数据表 | UCC2870x Constant-Voltage, Constant-Current Controller With Primary-Side Regulation 数据表 (Rev. A) | PDF | HTML | 2014-12-12 | ||
| 应用手册 | Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips | PDF | HTML | 2021-8-31 | |||
| 应用手册 | Minimize Standby Consumption for UCC287XX Family | 2019-8-1 | ||||
| 选择指南 | 电源管理指南 2018 | 2018-7-31 | ||||
| 应用手册 | Selecting Electrolitic Bus Capacitor for Universal Input | 2018-7-17 | ||||
| 应用手册 | Troubleshooting TI PSR controllers | 2016-10-3 | ||||
| 白皮书 | Control Challenges for Low Power AC/DC Converters | 2015-10-2 | ||||
| 白皮书 | Control Challenges for Low Power AC/DC Converters (PPT) | 2015-10-2 | ||||
| 应用手册 | UCC28700 5-W USB Flyback Design Review (Rev. C) | 2014-2-21 | ||||
| 更多文献资料 | Exposing the Inner Behavior of a Quasi-Resonant Flyback Converter | 2013-10-29 |
设计与开发
如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。
UCC28700EVM-068 — UCC28700 评估模块
SLUC381 — MathCAD Design Tool
SLUC408 — UCC28700 Excel 97 Design Tool
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |