UC2854B 增强型高功率因子前置稳压器
UC2854B 描述
The UC3854A/B products are pin compatibleenhanced versions of the UC3854. Like the UC3854, 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 UC3854A/B 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 amplifierwith soft-start, line voltage feedforward (VRMS squarer), input supply voltage clamp, and over current comparator round out the lilst of feataures.
|
UC2854B |
UC3854B |
| UVLO Thresholds On/Off(V) |
10.5/10 |
10.5/10 |
| Operating Supply(Max)(V) |
20 |
20 |
| Startup Current(mA) |
0.25 |
0.25 |
| Operating Supply Current(mA) |
12 |
12 |
| Vref(V) |
7.5 |
7.5 |
| Vref tol(%) |
1.3 |
1.3 |
| Duty Cycle(Max)(%) |
95 |
95 |
| Practical Operating Frequency(Max)(MHz) |
0.2 |
0.2 |
| Pin/Package |
16PDIP, 16SOIC, 20PLCC |
16PDIP, 16SOIC |
| Rating |
Catalog |
Catalog |
UC2854B 特性
- 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 芯片订购指南
| 器件 |
状态 |
温度 (oC) |
价格（美元） |
封装 | 引脚 |
封装数量 | 封装载体 |
丝印标记 |
| UC2854BDW |
ACTIVE |
-40 to 85 |
1.70 | 1ku |
SOIC (DW) | 16 |
40 | TUBE |
UC2854BDW |
| UC2854BDWG4 |
ACTIVE |
-40 to 85 |
1.70 | 1ku |
SOIC (DW) | 16 |
40 | TUBE |
UC2854BDW |
| UC2854BDWTR |
ACTIVE |
-40 to 85 |
1.65 | 1ku |
SOIC (DW) | 16 |
2000 | LARGE T&R |
UC2854BDW |
| UC2854BDWTRG4 |
ACTIVE |
-40 to 85 |
1.65 | 1ku |
SOIC (DW) | 16 |
2000 | LARGE T&R |
UC2854BDW |
| UC2854BN |
ACTIVE |
-40 to 85 |
1.70 | 1ku |
PDIP (N) | 16 |
25 | TUBE |
UC2854BN |
| UC2854BNG4 |
ACTIVE |
-40 to 85 |
1.70 | 1ku |
PDIP (N) | 16 |
25 | TUBE |
UC2854BN |
UC2854B 质量与无铅数据
| 器件 |
环保计划* |
铅/焊球涂层 |
MSL 等级/回流焊峰 |
环保信息与无铅 (Pb-free) |
DPPM / MTBF / FIT 率 |
| UC2854BDW |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
UC2854BDW |
| UC2854BDWG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
UC2854BDWG4 |
UC2854BDWG4 |
| UC2854BDWTR |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
UC2854BDWTR |
| UC2854BDWTRG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
UC2854BDWTRG4 |
UC2854BDWTRG4 |
| UC2854BN |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
|
UC2854BN |
| UC2854BNG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
UC2854BNG4 |
UC2854BNG4 |
UC2854B 应用技术支持与电子电路设计开发资源下载
- UC2854B 数据资料 dataSheet 下载.PDF
- TI 德州仪器AC/DC 和 DC/DC 电源产品选型与价格参考 . xls
- Dual MOSFET Driver
(PDF 498 KB)
- 标准线性产品交叉参考 (Rev. D)
(PDF 1058 KB)
- 模数规格和性能特性术语表 (Rev. A) (PDF 1993 KB)
- 所选封装材料的热学和电学性质 (PDF 645 KB)
- 高速数据转换 (PDF 1967 KB)
- Shelf-Life Evaluation of Lead-Free Component Finishes (PDF
1305 KB)
- Analog-to-Digital Converter Grounding Practices Affect System
Performance (PDF 56 KB)
- Principles of Data Acquisition and Conversion (PDF 50 KB)
- Interleaving Analog-to-Digital Converters (PDF 64 KB)
- What
Designers Should Know About Data Converter Drift (PDF 95 KB)
- Giving Delta-Sigma Converters a Gain Boost with a Front End
Analog Gain Stage (PDF 70 KB)
- Programming Tricks for Higher Conversion Speeds Utilizing Delta
Sigma Converters (PDF 105 KB)
UC2854B 工具与软件
