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TL2844B TL284xB, TL384xB

TL2844B 描述

The TL284xB and TL384xB series of control integrated circuits provide the features that are necessary to implement off-line or dc-to-dc fixed-frequency current-mode control schemes, with a minimum number of external components. Internally implemented circuits include an undervoltage lockout (UVLO) and a precision reference that is trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The TL284xB and TL384xB series are pin compatible with the standard TL284x and TL384x with the following improvements. The start-up current is specified to be 0.5 mA (max), while the oscillator discharge current is trimmed to 8.3 mA (typ). In addition, during undervoltage lockout conditions, the output has a maximum saturation voltage of 1.2 V while sinking 10 mA (VCC = 5 V).

Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges. Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TLx842B and TLx844B devices make them ideally suited to off-line applications. The corresponding typical thresholds for the TLx843B and TLx845B devices are 8.4 V (on) and 7.6 V (off). The TLx842B and TLx843B devices can operate to duty cycles approaching 100%. A duty-cycle range of 0% to 50% is obtained by the TLx844B and TLx845B by the addition of an internal toggle flip-flop, which blanks the output off every other clock cycle.The TL284xB-series devices are characterized for operation from -40°C to 85°C. The TL384xB-series devices are characterized for operation from 0°C to 70°C.

TL2842B TL2843B TL2844B TL2845B
Topology Boost, Flyback, Forward Boost, Flyback, Forward Boost, Flyback, Forward Boost, Flyback, Forward
Control Method Current Mode Current Mode Current Mode Current Mode
Duty Cycle(Max)(%) 100 100 50 50
Frequency(Max)(kHz) 500 500 500 500
UVLO Thresholds On/Off(V) 16/10 8.4/7.6 16/10 8.4/7.6
Pin/Package 14SOIC, 8PDIP, 8SOIC 14SOIC, 8SOIC, 8PDIP 14SOIC, 8PDIP, 8SOIC 14SOIC, 8PDIP, 8SOIC
Regulated Outputs(#) 1 1 1 1
Operating Temperature Range(°C) -40 to 85 -40 to 85 -40 to 85 -40 to 85
Rating Catalog Catalog Catalog Catalog
TL2844B 特性
TL2844B 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
TL2844BD ACTIVE -40 to 85 0.44 | 1ku SOIC (D) | 14 50 | TUBE TL2844BD
TL2844BD-8 ACTIVE -40 to 85 0.49 | 1ku SOIC (D) | 8 75 | TUBE TL2844BD
TL2844BDE4 ACTIVE -40 to 85 0.44 | 1ku SOIC (D) | 14 50 | TUBE TL2844BD
TL2844BDE4-8 ACTIVE -40 to 85 0.49 | 1ku SOIC (D) | 8 75 | TUBE TL2844BD
TL2844BDG4 ACTIVE -40 to 85 0.44 | 1ku SOIC (D) | 14 50 | TUBE TL2844BD
TL2844BDG4-8 ACTIVE -40 to 85 0.49 | 1ku SOIC (D) | 8 75 | TUBE TL2844BD
TL2844BDR ACTIVE -40 to 85 0.40 | 1ku SOIC (D) | 14 2500 | LARGE T&R TL2844BD
TL2844BDR-8 ACTIVE -40 to 85 0.40 | 1ku SOIC (D) | 8 2500 | LARGE T&R TL2844BD
TL2844BDRE4 ACTIVE -40 to 85 0.40 | 1ku SOIC (D) | 14 2500 | LARGE T&R TL2844BD
TL2844BDRE4-8 ACTIVE -40 to 85 0.40 | 1ku SOIC (D) | 8 2500 | LARGE T&R TL2844BD
TL2844BDRG4 ACTIVE -40 to 85 0.40 | 1ku SOIC (D) | 14 2500 | LARGE T&R TL2844BD
TL2844BDRG4-8 ACTIVE -40 to 85 0.40 | 1ku SOIC (D) | 8 2500 | LARGE T&R TL2844BD
TL2844BP ACTIVE -40 to 85 0.48 | 1ku PDIP (P) | 8 50 | TUBE TL2844BP
TL2844BPE4 ACTIVE -40 to 85 0.48 | 1ku PDIP (P) | 8 50 | TUBE TL2844BP
TL2844B 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
TL2844BD Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR   TL2844BD
TL2844BD-8 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR   TL2844BD-8
TL2844BDE4 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR   TL2844BDE4
TL2844BDE4-8 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR   TL2844BDE4-8
TL2844BDG4 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TL2844BDG4 TL2844BDG4
TL2844BDG4-8 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR   TL2844BDG4-8
TL2844BDR Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR   TL2844BDR
TL2844BDR-8 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR   TL2844BDR-8
TL2844BDRE4 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR   TL2844BDRE4
TL2844BDRE4-8 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR   TL2844BDRE4-8
TL2844BDRG4 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TL2844BDRG4 TL2844BDRG4
TL2844BDRG4-8 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR   TL2844BDRG4-8
TL2844BP Pb-Free (RoHS) CU NIPDAU N/A for Pkg Type   TL2844BP
TL2844BPE4 Pb-Free (RoHS) CU NIPDAU N/A for Pkg Type   TL2844BPE4
TL2844B 应用技术支持与电子电路设计开发资源下载
  1. TL2844B 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)
TL2844B 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
TL2844B 评估模块 TL2844BEVM 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