UC2854B-EP_TI 增强型产品高级高功率因数前置稳压器

UC2854B-EP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：增强型产品高级高功率因数前置稳压器
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UC2854B-EP的产品详情：

The UC2854B products are pin compatible enhanced versions of the UC2854. Like the UC2854, these products provide all of the functions necessary for active power factor corrected preregulators. The controller achieves near unity power factor by shaping the ac-input line current waveform to correspond to the ac-input line voltage. To do this the UC2854B uses average current mode control. Average current mode control maintains stable, low distortion sinusoidal line current without the need for slope compensation, unlike peak current mode control.

A 1% 7.5-V reference, fixed frequency oscillator, PWM, voltage amplifier with soft-start, line voltage feedforward (VRMS squarer), input supply voltage clamp, and over current comparator round out the list of features.

The UC2854B is available in a DW (SOIC-wide) package.

The UC2854A/B products improve upon the UC2854 by offering a wide bandwidth, low offset current amplifier, a faster responding and improved accuracy enable comparator, a VREF GOOD comparator, UVLO threshold options (16 V/10 V for offline, 10.5 V/10 V for startup from an auxiliary 12-V regulator), lower startup supply current, and an enhanced multiply/divide circuit.

New features like the amplifier output clamps, improved amplifier current sinking capability, and low offset VAC pin reduce the external component count while improving performance. Improved common mode input range of the multiplier output/current amplifier input allow the designer greater flexibility in choosing a method for current sensing. Unlike its predecessor, RSET controls only oscillator charging current and has no effect on clamping the maximum multiplier output current. This current is now clamped to a maximum of 2 × IAC at all times which simplifies the design process and provides foldback power limiting during brownout and extreme low line conditions.

UC2854B-EP的优势和特性：

Controlled Baseline
- One Assembly/Test Site, One Fabrication Site
Extended Temperature Performance of -55°C to 125°C
Enhanced Diminishing Manufacturing Sources (DMS) Support
Enhanced Product-Change Notification
Qualification Pedigree(1)
Controls Boost PWM to Near-Unity Power Factor
Limits Line Current Distortion to <3%
World-Wide Operation Without Switches
Accurate Power Limiting
Fixed-Frequency Average Current-Mode Control
High Bandwidth (5 MHz), Low-Offset Current Amplifier
Integrated Current- and Voltage Amplifier Output Clamps
Multiplier Improvements: Linearity, 500 mV VAC Offset (Eliminates External Resistor), 0 V to 5 V Multout Common-Mode Range
VREF GOOD Comparator
Faster and Improved Accuracy ENABLE Comparator
UVLO Options (16 V/10 V or 10.5 V/10 V)
300-μA Start-Up Supply Current

UC2854B-EP的参数（英文）：

Topology
Boost
Control mode
CCM
Practical operating frequency (Max) (MHz)
0.2
UVLO thresholds on/off (V)
10.5/10
Device type
Controllers
Operating supply current (mA)
12
Features
> 750W Applications, Average Current Mode, Continuous Control Mode , Enable
Rating
HiRel Enhanced Product
Operating temperature range (C)
-55 to 125

UC2854B-EP具体的完整产品型号参数及价格（美元）：

UC2854B-EP的完整型号有：UC2854BMDWREP、UC2854BMDWREPG4、V62/06612-01XE，以下是这些产品的关键参数及官网采购报价：

UC2854BMDWREP，工作温度：-55 to 125，封装：SOIC (DW)-16，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UC2854BMDWREP的批量USD价格：7.04（1000+）

UC2854BMDWREPG4，工作温度：-55 to 125，封装：SOIC (DW)-16，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UC2854BMDWREPG4的批量USD价格：7.04（1000+）

V62/06612-01XE，工作温度：-55 to 125，封装：SOIC (DW)-16，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V62/06612-01XE的批量USD价格：7.04（1000+）

UC2854B-EP的评估套件：

UC2854B-EP的电路图解：

UC2854B-EP的评估套件：