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UC3856 改进的电流模式 PWM 控制器

UC3856 描述

The UC3856 is a high performance version of the popular UC3846 series of current mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input to output delays have been minimized, and the current sense output is slew rate limited to reduce noise sensitivity. Fast 1.5A peak output stages have been added to allow rapid switching of power FETs.

A low impedance TTL compatible sync output has been implemented with a tri-state function when used as a sync input.

Internal chip grounding has been improved to minimize internal \x93noise\x94 caused when driving large capacitive loads. This, in conjunction with the improved differential current sense amplifier results in enhanced noise immunity.

UC1856 UC2856 UC3856
Topology Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull   Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull   Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull  
Control Method Current Mode   Current Mode   Current Mode  
Duty Cycle(Max)(%) 50   50   50  
Frequency(Max)(kHz) 1000   1000   1000  
UVLO Thresholds On/Off(V) 7.7/7   7.7/7   7.7/7  
Pin/Package 16CDIP, 20LCCC   16PDIP, 16SOIC   16PDIP, 16SOIC, 20PLCC  
Regulated Outputs(#) 2   2   2  
Operating Temperature Range(°C) -55 to 125   -40 to 85   0 to 70  
Rating Military   Catalog   Catalog 
UC3856 特性
UC3856 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
UC3856DW ACTIVE 0 to 70 1.90 | 1ku SOIC (DW) | 16 40 | TUBE UC3856DW
UC3856DWG4 ACTIVE 0 to 70 1.90 | 1ku SOIC (DW) | 16 40 | TUBE UC3856DW
UC3856DWTR ACTIVE 0 to 70 1.70 | 1ku SOIC (DW) | 16 2000 | LARGE T&R UC3856DW
UC3856DWTRG4 ACTIVE 0 to 70 1.70 | 1ku SOIC (DW) | 16 2000 | LARGE T&R UC3856DW
UC3856N ACTIVE 0 to 70 1.90 | 1ku PDIP (N) | 16 25 | TUBE UC3856N
UC3856NG4 ACTIVE 0 to 70 1.90 | 1ku PDIP (N) | 16 25 | TUBE UC3856N
UC3856Q ACTIVE 0 to 70 2.25 | 1ku PLCC (FN) | 20 46 | TUBE UC3856Q
UC3856QG3 ACTIVE 0 to 70 2.25 | 1ku PLCC (FN) | 20 46 | TUBE UC3856Q
UC3856 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
UC3856DW Green (RoHS & no Sb/Br)  CU NIPDAU  Level-2-260C-1 YEAR   UC3856DW
UC3856DWG4 Green (RoHS & no Sb/Br)  CU NIPDAU  Level-2-260C-1 YEAR UC3856DWG4 UC3856DWG4
UC3856DWTR Green (RoHS & no Sb/Br)  CU NIPDAU  Level-2-260C-1 YEAR   UC3856DWTR
UC3856DWTRG4 Green (RoHS & no Sb/Br)  CU NIPDAU  Level-2-260C-1 YEAR UC3856DWTRG4 UC3856DWTRG4
UC3856N Green (RoHS & no Sb/Br)  CU NIPDAU  N/A for Pkg Type   UC3856N
UC3856NG4 Green (RoHS & no Sb/Br)  CU NIPDAU  N/A for Pkg Type UC3856NG4 UC3856NG4
UC3856Q Green (RoHS & no Sb/Br)  CU SN  Level-2-260C-1 YEAR   UC3856Q
UC3856QG3 Green (RoHS & no Sb/Br)  CU SN  Level-2-260C-1 YEAR   UC3856QG3
UC3856 应用技术支持与电子电路设计开发资源下载
  1. UC3856 数据资料 dataSheet 下载.PDF
  2. TI 德州仪器AC/DC 和 DC/DC 电源产品选型与价格参考 . xls
  3. Dual MOSFET Driver (PDF  498 KB)
  4. 标准线性产品交叉参考 (Rev. D)   (PDF  1058 KB)
  5. 模数规格和性能特性术语表 (Rev. A) (PDF 1993 KB)
  6. 所选封装材料的热学和电学性质 (PDF 645 KB)
  7. 高速数据转换 (PDF 1967 KB)
  8. Shelf-Life Evaluation of Lead-Free Component Finishes (PDF 1305 KB)
  9. Analog-to-Digital Converter Grounding Practices Affect System Performance (PDF 56 KB)
  10. Principles of Data Acquisition and Conversion (PDF 50 KB)
  11. Interleaving Analog-to-Digital Converters (PDF 64 KB)
  12. What Designers Should Know About Data Converter Drift (PDF 95 KB)
  13. Giving Delta-Sigma Converters a Gain Boost with a Front End Analog Gain Stage (PDF 70 KB)
  14. Programming Tricks for Higher Conversion Speeds Utilizing Delta Sigma Converters (PDF 105 KB)
UC3856 工具与软件
名称 型号 公司 工具/软件类型
音频的快速搜索选择工具 AUDIO_SELECTION_TOOL Texas Instruments 免费评估工具
UC3856 评估模块 UC3856EVM Texas Instruments 开发电路板/EVM
用于音频转换器的软件驱动程序 CODECDRIVERS-SW Texas Instruments  应用软件