UC2855B_TI 具有 10.5V/10V UVLO 和零电压转换模式、温度范围为

UC2855B的基本参数

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 - 功率因数校正 (PFC) 控制器
功能描述：具有 10.5V/10V UVLO 和零电压转换模式、温度范围为 –40°C 至 85°C 的双极性 CCM PFC 控制器
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UC2855B的产品详情：

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.

UC2855B的优势和特性：

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

UC2855B的参数（英文）：

Topology
Boost
Control mode
CCM
Practical operating frequency (Max) (MHz)
0.5
UVLO thresholds on/off (V)
10.5/10
Device type
Controllers
Operating supply current (mA)
17
Features
> 750W Applications, Average Current Mode, Continuous Control Mode , Enable, OVP
Rating
Catalog
Operating temperature range (C)
-40 to 85

UC2855B具体的完整产品型号参数及价格（美元）：

UC2855B的完整型号有：UC2855BDW、UC2855BDWTR、UC2855BN，以下是这些产品的关键参数及官网采购报价：

UC2855BDW，工作温度：-40 to 85，封装：SOIC (DW)-20，包装数量MPQ：25个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UC2855BDW的批量USD价格：7.725（1000+）

UC2855BDWTR，工作温度：-40 to 85，封装：SOIC (DW)-20，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UC2855BDWTR的批量USD价格：6.622（1000+）

UC2855BN，工作温度：-40 to 85，封装：PDIP (N)-20，包装数量MPQ：20个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：NIPDAU，TI官网UC2855BN的批量USD价格：8.553（1000+）

UC2855B的评估套件：

UC2855B的电路图解：

UC2855B的评估套件：