UC3847 电流模式 PWM 控制器
UC3847 描述
The UC1846/7 family of control ICs provides all of the necessary features to implement fixed frequency, current mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel "power modules" while maintaining equal current sharing.
Protection circuitry includes built-in under-voltage lockout and programmable current limit in addition to soft start capability. A shut-down function is also available which can in itiate either a complete shutdown with automatic restart or latch the supply off.
| |
UC2847 |
UC3847 |
| Topology |
Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull |
Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull |
| Control Method |
Current Mode |
Current Mode |
| Duty Cycle(Max)(%) |
50 |
50 |
| Frequency(Max)(kHz) |
450 |
450 |
| UVLO Thresholds On/Off(V) |
7.7/6.95 |
7.7/6.95 |
| Pin/Package |
16PDIP, 16SOIC |
16PDIP, 16SOIC |
| Regulated Outputs(#) |
2 |
2 |
| Operating Temperature Range(°C) |
-40 to 85 |
0 to 70 |
| Rating |
Catalog |
Military |
UC3847 特性
- Automatic Feed Forward Compensation
- Programmable Pulse-by-Pulse Current Limiting
- Automatic Symmetry Correction in Push-pull Configuration
- Enhanced Load Response Characteristics
- Parallel Operation Capability for Modular Power Systems
- Differential Current Sense Amplifier with Wide Common Mode Range
- Double Pulse Suppression
- 500mA (Peak) Totem-pole Outputs
- ±1% Bandgap Reference
- Under-voltage Lockout
- Soft Start Capability
- Shutdown Terminal
- 500kHZ Operation
UC3847 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 |
| UC3847DW |
ACTIVE |
0 to 70 |
1.75 | 1ku |
SOIC (DW) | 16 |
40 | TUBE |
UC3847DW |
| UC3847DWG4 |
ACTIVE |
0 to 70 |
1.75 | 1ku |
SOIC (DW) | 16 |
40 | TUBE |
UC3847DW |
| UC3847DWTR |
ACTIVE |
0 to 70 |
1.70 | 1ku |
SOIC (DW) | 16 |
2000 | LARGE T&R |
UC3847DW |
| UC3847DWTRG4 |
ACTIVE |
0 to 70 |
1.70 | 1ku |
SOIC (DW) | 16 |
2000 | LARGE T&R |
UC3847DW |
| UC3847N |
ACTIVE |
0 to 70 |
1.75 | 1ku |
PDIP (N) | 16 |
25 | TUBE |
UC3847N |
| UC3847NG4 |
ACTIVE |
0 to 70 |
1.75 | 1ku |
PDIP (N) | 16 |
25 | TUBE |
UC3847N |
| UC3847Q |
ACTIVE |
0 to 70 |
2.10 | 1ku |
PLCC (FN) | 20 |
46 | TUBE |
UC3847Q |
| UC3847QG3 |
ACTIVE |
0 to 70 |
2.10 | 1ku |
PLCC (FN) | 20 |
46 | TUBE |
UC3847Q |
| UC3847QTR |
ACTIVE |
0 to 70 |
1.70 | 1ku |
PLCC (FN) | 20 |
1000 | LARGE T&R |
UC3847Q |
| UC3847QTRG3 |
ACTIVE |
0 to 70 |
1.70 | 1ku |
PLCC (FN) | 20 |
1000 | LARGE T&R |
UC3847Q |
UC3847 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 |
| UC3847DW |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
UC3847DW |
| UC3847DWG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
UC3847DWG4 |
UC3847DWG4 |
| UC3847DWTR |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
UC3847DWTR |
| UC3847DWTRG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
UC3847DWTRG4 |
UC3847DWTRG4 |
| UC3847N |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
|
UC3847N |
| UC3847NG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
UC3847NG4 |
UC3847NG4 |
| UC3847Q |
Green (RoHS & no Sb/Br) |
CU SN |
Level-2-260C-1 YEAR |
|
UC3847Q |
| UC3847QG3 |
Green (RoHS & no Sb/Br) |
CU SN |
Level-2-260C-1 YEAR |
|
UC3847QG3 |
| UC3847QTR |
Green (RoHS & no Sb/Br) |
CU SN |
Level-2-260C-1 YEAR |
|
UC3847QTR |
| UC3847QTRG3 |
Green (RoHS & no Sb/Br) |
CU SN |
Level-2-260C-1 YEAR |
|
UC3847QTRG3 |
UC3847 应用技术支持与电子电路设计开发资源下载
- UC3847 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)
UC3847 工具与软件