TI,TI公司,TI代理商
TI(德州仪器)| TI产品型号搜索
专营TI元器件,强大的现货交付能力,解决您的采购难题
全流程提供TI现货供应链服务
当前位置:TI公司 > > TI芯片 >> UC2855A
UC2855A技术文档下载:
UC2855A技术文档产品手册下载
UC2855A - 产品图解:
UC2855A-高性能功率因素前置稳压器
承诺原装正品
专营TI,真正优化您的供应链
TI产品 - UC2855A介绍
UC2855A - 高性能功率因素前置稳压器

UC2855A是TI公司的一款功率因数校正产品,UC2855A是高性能功率因素前置稳压器,本页介绍了UC2855A的产品说明、应用、特性等,并给出了与UC2855A相关的TI元器件型号供参考。

UC2855A - 高性能功率因素前置稳压器 - 功率因数校正 - 离线隔离型DC/DC控制器和转换器 - TI公司(Texas Instruments,德州仪器)

产品描述

The UC3855A/B provides all the control features necessary for high power, high frequency PFC boost converters. The average current mode control method allows for stable, low distortion AC line current programming without the need for slope compensation. In addition, the UC3855 utilizes an active snubbing or ZVT (Zero Voltage Transition technique) to dramatically reduce diode recovery and MOSFET turn-on losses, resulting in lower EMI emissions and higher efficiency. Boost converter switching frequencies up to 500kHz are now realizable, requiring only an additional small MOSFET, diode, and inductor to resonantly soft switch the boost diode and switch. Average current sensing can be employed using a simple resistive shunt or a current sense transformer. Using the current sense transformer method, the internal current synthesizer circuit buffers the inductor current during the switch on-time, and reconstructs the inductor current during the switch off-time. Improved signal to noise ratio and negligible current sensing losses make this an attractive solution for higher power applications.

The UC3855A/B also features a single quadrant multiplier, squarer, and divider circuit which provides the programming signal for the current loop. The internal multiplier current limit reduces output power during low line conditions. An overvoltage protection circuit disables both controller outputs in the event of a boost output OV condition.

Low startup supply current, UVLO with hysteresis, a 1% 7.5V reference, voltage amplifier with softstart, input supply voltage clamp, enable comparator, and overcurrent comparator complete the list of features. Available packages include: 20 pin N, DW, Q, J, and L.

产品特性

  • Controls Boost PWM to Near Unity Power Factor
  • Fixed Frequency Average Current Mode Control Minimizes Line Current Distortion
  • Built-in Active Snubber (ZVT) Allows Operation to 500kHz, Improved EMI and Efficiency
  • Inductor Current Synthesizer allows Single Current Transformer Current Sense for Improved Efficiency and Noise Margin
  • Accurate Analog Multiplier with Line Compensator allows for Universal Input Voltage Operation
  • High Bandwidth (5MHz), Low Offset Current Amplifier
  • Overvoltage and Overcurrent protection
  • Two UVLO Threshold Options
  • 150&mirco;A Startup Supply Current Typical
  • Precision 1% 7.5V Reference

下面可能是您感兴趣的TI公司功率因数校正元器件
  • SN75LVDS391 - 四路 LVDS 发送器
  • TPS62263 - 采用 2x2mm SON/TSOT23 封装的 2.25MHz 600mA 降压转换器
  • ADS7952-Q1 - 汽车类 12位、1MSPS、12 通道单端微功耗串行接口 ADC
  • TPD1S514 - USB 充电器,VBUS_CON 引脚带过压、电涌和 ESD 保护
  • SN54HC4024 - 异步 7 位二进制计数器
  • TPS65252 - 具有 USB 开关的 4.5V 至 16V 输入、3A/2A 输出双路降压转换器
  • LM9070 - 具有保持连接开/关控制的低压降系统电压稳压器
  • LMP91051 - 用于 (NDIR) 遥感应用的 LMP91051 可配置 AFE
  • DAC7578 - 12 位、8 通道、超低短时脉冲波形干扰、电压输出、2 线接口 DAC
  • TPS3838K33-Q1 - 具有 10ms/200ms 可选择延迟时间的汽车类 220nA 监控器
  • 节约时间成本,提高采购效率,TI官网授权代理
    TI公司|TI德州仪器|德州仪器TI公司代理商|TI芯片代理商
    TI公司产品现货专家,订购TI公司产品不限最低起订量,TI产品大陆现货即时发货,香港库存3-5天发货,海外库存7-10天发货
    寻找全球TI代理商现货货源 - TI公司(德州仪器)电子元件在线订购