- 制造厂商:TI
- 产品类别:电源管理
- 技术类目:交流/直流和隔离式直流/直流开关稳压器 - PWM 控制器
- 功能描述:具有同步整流功能的绿色环保相移全桥控制器
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The UCC28950 enhanced phase-shifted controller builds upon Texas Instrument’s industry standard UCx895 phase-shifted controller family with enhancements that offer best in class efficiency in today’s high performance power systems. The UCC28950 implements advanced control of the full-bridge along with active control of the synchronous rectifier output stage.
The primary-side signals allow programmable delays to ensure ZVS operation over wide-load current and input voltage range, while the load current naturally tunes the secondary-side synchronous rectifiers switching delays, maximizing overall system efficiency.
The UCC28950 also offers multiple light-load management features including burst mode and dynamic SR on/off control when transitioning in and out of Discontinuous Current Mode (DCM) operation, ensuring ZVS operation is extended down to much lighter loads.
In addition, the UCC28950 includes support for current or voltage mode control. Programmable switching frequency up to 1 MHz and a wide set of protection features including cycle-by-cycle current limit, UVLO and thermal shutdown. A 90-degree phase-shifted interleaved synchronized operation can be easily arranged between two converters.
The UCC28950 is available in TSSOP-24 package.
For all available packages, see the orderable addendum at the end of the datasheet.- Enhanced Wide Range Resonant Zero Voltage Switching (ZVS) Capability
- Direct Synchronous Rectifier (SR) Control
- Light-Load Efficiency Management Including
- Burst Mode Operation
- Discontinuous Conduction Mode (DCM), Dynamic SR On and Off Control with Programmable Threshold
- Programmable Adaptive Delay
- Average or Peak Current Mode Control With Programmable Slope Compensation and Voltage Mode Control
- Naturally Handles Pre-Biased Start Up With DCM Mode
- Closed Loop Soft Start and Enable Function
- Programmable Switching Frequency up to 1 MHz with Bi-Directional Synchronization
- (±3%) Cycle-by-Cycle Current Limit Protection With Hiccup Mode Support
- 150-μA Start-Up Current
- VDD Undervoltage Lockout
- Wide Temperature Range –40°C to +125°C
- Topology
- Phase-Shifted Full-Bridge
- Duty cycle (Max) (%)
- 95
- Supply voltage (Max) (V)
- 17
- UVLO thresholds on/off (V)
- 7.3/6.75
- Features
- Adjustable Switching Frequency, Current Limiting, Error Amplifier, Light Load Efficiency, SR Logic, Soft Start, Soft Switching
- Operating temperature range (C)
- -40 to 125
- Rating
- Catalog
- Frequency (Max) (kHz)
- 1000
- Gate drive (Typ) (A)
- 0.2
UCC28950的完整型号有:UCC28950PW、UCC28950PWR,以下是这些产品的关键参数及官网采购报价:
UCC28950PW,工作温度:-40 to 125,封装:TSSOP (PW)-24,包装数量MPQ:60个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:NIPDAU,TI官网UCC28950PW的批量USD价格:2.772(1000+)
UCC28950PWR,工作温度:-40 to 125,封装:TSSOP (PW)-24,包装数量MPQ:2000个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:NIPDAU,TI官网UCC28950PWR的批量USD价格:2.31(1000+)
UCC27714EVM-551 — UCC27714 600W 相移全桥转换器评估模块
此 600W EVM 旨在展示如何在相移全桥转换器中使用 UCC28950 控制 IC、UCC27524A 和 UCC27714 栅极驱动器实现 50% 至 100% 负载的 ZVS。
UCC28950 and UCC28951 PSpice Transient Model (Rev. B)
这是一种 350W 高速全桥相移 ZVT 同步整流直流/直流参考设计。此设计适用于电信应用,用于提供射频功率放大器级。此设计采用 UCC28950 电压模式正向和平均电流限制反向转换器(二象限转换器)。此设计可在 200us 内调制 20V 至 32V 输出电压(最高 200uF 的电容负载),因此称为:慢漏调制。该转换器还具有满载步进功能。这是一种适用于高度精密型电信应用的极小设计。这套系统还可用于所有其他二象限应用。输 入电压范围:36VDC-60VDC;输出电压:20VDC…32VDC(可调);输出电流:12A(18A 峰值)。PMP8606 — 300W 全桥相移 (FBPS) DC/DC 电源参考设计
这项设计是一款工作在电压模式下的 100kHz FBPS 转换器。该设计支持 400Vdc 到 750Vdc 的输入电压范围,并能提供已调节 24V/12A 电源。TI 的 UCC28950 器件可在高输入电压下实现高效率。PMP5568 — 350W 高性能、高速电源
该项目是一个完整的 350W、高性能、高速离线电源解决方案。它包含一个由微控制器驱动的新颖同步桥接整流器、一个两相交错 PFC 阶段以及一个作为降压转换器的相移全桥。它具有通用输入(85 至 265V AC),且输出电压可在 12V 至 14V 之间调节。连续输出电流为 25A,峰值电流为 27A。第二台微控制器可监控多个值(输入电压、PFC 电压、输出电压、输出电流、温度)、可作为用户界面(LCD、按钮)、可调节输出电压并同步所有转换器的开关频率。PMP6712 — 适用于 PoE 电源设备 (PSE) 的双通道全桥转换器参考设计 (54V @ 30A)
此设计是一种相移全桥转换器参考设计,能够提供 1600W 隔离型输出功率,实现超过 96% 的效率。该设计在双相主要/次要配置中使用 UCC28950 控制器。LM5017 恒定导通时间同步降压稳压器为使用具有隔离型反激式绕组的耦合线圈的初级和次级侧电路提供偏置电源。隔离电压指定为 2250VDC,使该设计可以在以太网供电和其他电信应用中用作系统电源。