UC2855B 高性能功率因素前置稳压器
UC2855B 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.
|
UC2855B |
UC3855B |
| UVLO Thresholds On/Off(V) |
10.5/10 |
10.5/10 |
| Operating Supply(Max)(V) |
20 |
20 |
| Startup Current(mA) |
0.15 |
0.15 |
| Operating Supply Current(mA) |
17 |
17 |
| Vref(V) |
7.5 |
7.5 |
| Vref tol(%) |
1.5 |
1.5 |
| Duty Cycle(Max)(%) |
95 |
95 |
| Practical Operating Frequency(Max)(MHz) |
0.5 |
0.5 |
| Pin/Package |
20PDIP, 20SOIC |
20PDIP, 20SOIC |
| Rating |
Catalog |
Catalog |
UC2855B 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 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 |
| UC2855BDW |
ACTIVE |
-40 to 85 |
1.70 | 1ku |
SOIC (DW) | 20 |
40 | TUBE |
UC2855BDW |
| UC2855BDWG4 |
ACTIVE |
-40 to 85 |
1.70 | 1ku |
SOIC (DW) | 20 |
40 | TUBE |
UC2855BDW |
| UC2855BN |
ACTIVE |
-40 to 85 |
1.70 | 1ku |
PDIP (N) | 20 |
25 | TUBE |
UC2855BN |
| UC2855BNG4 |
ACTIVE |
-40 to 85 |
1.70 | 1ku |
PDIP (N) | 20 |
25 | TUBE |
UC2855BN |
UC2855B 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 |
| UC2855BDW |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
UC2855BDW |
| UC2855BDWG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
UC2855BDWG4 |
UC2855BDWG4 |
| UC2855BN |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
|
UC2855BN |
| UC2855BNG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
UC2855BNG4 |
UC2855BNG4 |
UC2855B 应用技术支持与电子电路设计开发资源下载
- UC2855B 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)
UC2855B 工具与软件
