UC3851 可编程脱机 PWM 控制器
UC3851 描述
The UC1851 family of PWM controllers are optimized for off-line primary side control. These devices include a high current totem pole output stage and a toggle flip-flop for absolute 50% duty cycle limiting. In all other respects this line of controllers is pin for pin compatible with the UC1841 series. Inclusion of all major housekeeping functions in these high performance controllers makes them ideal for use in cost sensitive applications.
Important features of these controllers include low current start-up, linear feed-forward for constant volt-second operation, and compatibility with both voltage or current mode control. In addition, these devices include a programmable start threshold, as well as programmable over-voltage, under-voltage, and over current fault thresholds.
|
UC2851 |
UC3851 |
| Topology |
Boost, Buck, Flyback, Forward |
Boost, Buck, Flyback, Forward |
| Control Method |
Current Mode |
Current Mode, Voltage Mode |
| Duty Cycle(Max)(%) |
50 |
50 |
| Frequency(Max)(kHz) |
450 |
450 |
| UVLO Thresholds On/Off(V) |
8/7.8 |
8/7.8 |
| Pin/Package |
18PDIP, 18SOIC |
18PDIP, 18SOIC |
| Regulated Outputs(#) |
1 |
1 |
| Operating Temperature Range(°C) |
-40 to 85 |
0 to 70 |
| Rating |
Catalog |
Catalog |
UC3851 特性
- All Control, Driving, Monitoring, and Protection Functions Included
- Low-Current Off Line Start Circuit
- Voltage Feed Forward or Current Mode Control
- High Current Totem Pole Output
- 50% Absolute Max Duty Cycle
- PWM Latch for Single Pulse Per Period
- Pulse-by-Pulse Current Limiting plus Shutdown for Over-Current Fault
- No Start-Up or Shutdown Transients
- Slow Turn-On Both Initially and After Fault Shutdown
- Shutdown Upon Over or Under Voltage Sensing
- Latch Off or Continuous Retry After Fault
- 1% Reference Accuracy
- 500kHz Operation
- 18 Pin DIL or 20 Pin PLCC Package
UC3851 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 |
| UC3851DW |
ACTIVE |
0 to 70 |
1.75 | 1ku |
SOIC (DW) | 16 |
25 | TUBE |
UC3851DW |
| UC3851DWG4 |
ACTIVE |
0 to 70 |
1.75 | 1ku |
SOIC (DW) | 16 |
25 | TUBE |
UC3851DW |
| UC3851DWTR |
ACTIVE |
0 to 70 |
1.70 | 1ku |
SOIC (DW) | 16 |
2000 | LARGE T&R |
UC3851DW |
| UC3851DWTRG4 |
ACTIVE |
0 to 70 |
1.70 | 1ku |
SOIC (DW) | 16 |
2000 | LARGE T&R |
UC3851DW |
| UC3851N |
ACTIVE |
0 to 70 |
1.75 | 1ku |
PDIP (N) | 16 |
20 | TUBE |
UC3851N |
| UC3851NG4 |
ACTIVE |
0 to 70 |
1.75 | 1ku |
PDIP (N) | 16 |
20 | TUBE |
UC3851N |
UC3851 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 |
| UC3851DW |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
UC3851DW |
| UC3851DWG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
UC3851DWG4 |
UC3851DWG4 |
| UC3851DWTR |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
UC3851DWTR |
| UC3851DWTRG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
UC3851DWTRG4 |
UC3851DWTRG4 |
| UC3851N |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
|
UC3851N |
| UC3851NG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
UC3851NG4 |
UC3851NG4 |
UC3851 应用技术支持与电子电路设计开发资源下载
- UC3851 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)
UC3851 工具与软件