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 | UCC28720 Constant-Voltage, Constant-Current Controller With Primary-Side Regulation 数据表 (Rev. B) | PDF | HTML | 2015-9-30 | ||
| 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 | ||||
| 应用手册 | Maximum Output Power and Thermal Considerations for UCC28720 and UCC28722 | 2017-12-6 | ||||
| 应用手册 | Troubleshooting TI PSR controllers | 2016-10-3 | ||||
| 技术文章 | Slim down your flyback; lose that excess snubber | PDF | HTML | 2016-2-15 | |||
| 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 | ||||
| 技术文章 | Designing multiple output converters with primary side sensing | PDF | HTML | 2015-8-4 | |||
| 应用手册 | 低功耗无Y电容原边调整充电器的设计 | 2014-1-16 | ||||
| 应用手册 | 5-W USB Flyback Design Example Using the UCC28722 | 2014-1-8 |
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）。
UCC28720EVM-212 — 用于 USB 离线适配器的 UCC28720EVM-212 5W 评估模块
PMP9622 — 350W 恒压 - 恒流 (CVCC) 相移全桥参考设计
该参考设计使用 UCC3895 相移全桥控制器来实现高效、120VAC 输入到 44VDC 高达 8A 输出。 电源设置为恒压恒流。 电压和电流由固定的电阻值设置，并可由实际产品中的微处理器设置。 该设计通过用 UCC28720 PWM 控制器的低成本 BJT 反激进行偏置。
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| SOIC (D) | 7 | Ultra Librarian |
订购和质量
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