The UC1854 provides active-power factor correction for power systems that otherwise would draw non-sinusoidal current from sinusoidal power lines. This device implements all the control functions necessary to build a power supply capable of optimally using available power-line current while minimizing line-current distortion. To do this, the UC1854 contains a voltage amplifier, an analog multiplier and divider, a current amplifier, and a fixed-frequency PWM.

In addition, the UC1854 contains a power MOSFET-compatible gate driver, 7.5-V reference, line anticipator, load-enable comparator, low-supply detector, and overcurrent comparator.

The UC1854 uses average current-mode control to accomplish fixed-frequency current control with stability and low distortion. Unlike peak current-mode, average current control accurately maintains sinusoidal line current without slope compensation and with minimal response to noise transients.

The high reference voltage and high oscillator amplitude of the UC1854 minimize noise sensitivity while fast PWM elements permit chopping frequencies above 200 kHz. The UC1854 is used in single-phase and three-phase systems with line voltages that vary from 75 V to 275 V and line frequencies across the 50-Hz to 400-Hz range. To reduce the burden on the circuitry that supplies power to this device, the UC1854 features low starting supply current.

These devices are available packaged in 16-pin plastic and ceramic dual in-line packages, and a variety of surface-mount packages.

• Control Boost PWM to 0.99 Power Factor
• Limit Line-Current Distortion to < 5%
• World-Wide Operation Without Switches
• Feedforward Line Regulation
• Average Current-Mode Control
• Low Noise Sensitivity
• Low Startup Supply Current
• Fixed-Frequency PWM Drive
• Low-Offset Analog Multiplier and Divider
• 1-A Totem-Pole Gate Driver
• Precision Voltage Reference

• Topology
• Boost
• Control mode
• CCM
• Practical operating frequency (Max) (MHz)
• 0.2
• UVLO thresholds on/off (V)
• 16/10
• Device type
• Controllers
• Operating supply current (mA)
• 10
• Features
• > 750W Applications, Average Current Mode, Continuous Control Mode , Enable
• Rating
• Military
• Operating temperature range (C)
• -40 to 85

UC2854BM的完整型号有：UC2854BJ，以下是这些产品的关键参数及官网采购报价：

UC2854BJ，工作温度：-40 to 85，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网UC2854BJ的批量USD价格：23.184（1000+）

UC2854BJ，工作温度：-40 to 85，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网UC2854BJ的批量USD价格：23.184（1000+）