UCC28250
- Prebiased Start-up
- Synchronous Rectifier Control Outputs With Programmable Delays (Including Zero Delay Support)
- Voltage Mode Control With Input Voltage Feed-Forward or Current Mode Control
- Primary or Secondary-Side Control
- 3.3-V, 1.5% Accurate Reference Output
- 1-MHz Capable Switching Frequency
- 1% Accurate Cycle-by-Cycle Overcurrent Protection with Matched Duty Cycle Outputs
- Programmable Soft-Start and Hiccup Restart Timer
- Thermally Enhanced 4-mm × 4-mm QFN-20 Package and 20-pin TSSOP Package
The UCC28250 PWM controller is designed for high power density applications that may have stringent prebiased start-up requirements. The integrated synchronous rectifier control outputs target high-efficiency and high-performance topologies such as half-bridge, full-bridge, interleaved forward, and push-pull. The UCC27200 half-bridge drivers and UCC2732X MOSFET drivers used in conjunction with the UCC28250 provide a complete power converter solution.
Externally programmable soft-start, used in conjunction with an internal prebiased start-up circuit, allows the controller to gradually reach a steady-state operating point under all output conditions. The UCC28250 can be configured for primary or secondary-side control and either voltage or current mode control can be implemented.
The oscillator operates at frequencies up to 2 MHz, and can be synchronized to an external clock. Input voltage feedforward, cycle-by-cycle current limit, and a programmable hiccup timer allow the system to stay within a safe operation range. Input voltage, output voltage and temperature protection can be implemented. Dead time between primary-side switch and secondary-side synchronous rectifiers can be independently programmed.
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 | UCC28250 Advanced PWM Controller With Prebias Operation 数据表 (Rev. D) | PDF | HTML | 2015-6-28 | ||
| 选择指南 | 电源管理指南 2018 | 2018-7-31 | ||||
| 应用手册 | Differences Between the UCC28251 and UCC28250 and Evaluation of the UCC28251 in (Rev. A) | 2013-2-15 | ||||
| 应用手册 | 如何调整UCC28250打嗝重启时间和逐周期过流保护延迟时间之间的固定比例关系 | 2012-1-13 | ||||
| 应用手册 | Designing UCC28250 as a Secondary Side Control with a Pre-Bias Condition | 2010-11-24 |
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）。
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SLUC260 — UCC28250 Excel Design Tool
PMP8878 — 基于 UCC28250 的 1/8 砖型隔离式 DC/DC 电信电源模块
PMP8878 是基于 UCC28250 高级 PWM 控制器的全功能 1/8 砖型隔离式直流/直流电信电源模块。参考设计采用次级侧控制和硬开关全桥电源拓扑，可在 40V-75V 输入源宽范围内运行时提供 12V/180W 输出功率。该参考设计的亮点包括：95% 峰值效率、预偏置启动、过热保护和过流保护（间断模式）。偏置电源块采用 UCC25230，而该设计中采用的闸极驱动器包括用于驱动 SR MOSFET 的 UCC27324 和用于驱动初级侧半桥 MOSFET 的 UCC27201。
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| TSSOP (PW) | 20 | Ultra Librarian |
| VQFN (RGP) | 20 | Ultra Librarian |
订购和质量
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