UC3841 可编程脱机 PWM 控制器
UC3841 描述
The UC1841 family of PWM controllers has been designed to increase the level of versatility while retaining all of the performance features of the earlier UC1840 devices. While still optimized for highly-efficient boot-strapped primary-side operation in forward or flyback power converters, the UC1841 is equally adept in implementing both low and high voltage input DC to DC converters. Important performance features include a low-current starting circuit, linear feed-forward for constant volt-second operation, and compatibility with either voltage or current mode topologies.
In addition to start-up and normal regulating PWM functions, these devices include built in protection from over-voltage, under-voltage, and over-current fault conditions with the option for either latch-off or automatic restart.
| |
UC2841 |
UC3841 |
| Topology |
Boost, Buck, Flyback, Forward |
Boost, Flyback, Forward |
| Control Method |
Current Mode, Voltage Mode |
Current Mode, Voltage Mode |
| Duty Cycle(Max)(%) |
95 |
95 |
| 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 |
Military |
Military |
UC3841 特性
- All Control, Driving, Monitoring, and Protection Functions Included
- Low-current, Off-line Start Circuit
- Voltage Feed Forward or Current Mode Control
- Guaranteed Duty Cycle Clamp
- 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
- PWM Output Switch Usable to 1A Peak Current
- 1% Reference Accuracy
- 500kHz Operation
- 18 Pin DIL Package
UC3841 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 |
| UC3841DW |
ACTIVE |
0 to 70 |
5.60 | 1ku |
SOIC (DW) | 18 |
40 | TUBE |
UC3841DW |
| UC3841DWG4 |
ACTIVE |
0 to 70 |
5.60 | 1ku |
SOIC (DW) | 18 |
40 | TUBE |
UC3841DW |
| UC3841DWTR |
ACTIVE |
0 to 70 |
5.60 | 1ku |
SOIC (DW) | 18 |
2000 | LARGE T&R |
UC3841DW |
| UC3841DWTRG4 |
ACTIVE |
0 to 70 |
5.60 | 1ku |
SOIC (DW) | 18 |
2000 | LARGE T&R |
UC3841DW |
| UC3841J |
OBSOLETE |
0 to 70 |
|
CDIP (J) | 18 |
|
UC3841J |
| UC3841N |
ACTIVE |
0 to 70 |
5.60 | 1ku |
PDIP (N) | 18 |
20 | TUBE |
UC3841N |
| UC3841NG4 |
ACTIVE |
0 to 70 |
5.60 | 1ku |
PDIP (N) | 18 |
20 | TUBE |
UC3841N |
UC3841 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 |
| UC3841DW |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
UC3841DW |
| UC3841DWG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
UC3841DWG4 |
UC3841DWG4 |
| UC3841DWTR |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
UC3841DWTR |
| UC3841DWTRG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
UC3841DWTRG4 |
UC3841DWTRG4 |
| UC3841N |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
|
UC3841N |
| UC3841NG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
UC3841NG4 |
UC3841NG4 |
UC3841 应用技术支持与电子电路设计开发资源下载
- UC3841 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)
UC3841 工具与软件