TL2845B TL284xB, TL384xB
TL2845B 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 |
TL2845B 特性
- Low Start-Up Current (<0.5 mA)
- Trimmed Oscillator Discharge Current
- Current Mode Operation to 500 kHz
- Automatic Feed-Forward Compensation
- Latching PWM for Cycle-by-Cycle Current Limiting
- Internally Trimmed Reference With Undervoltage Lockout
- High-Current Totem-Pole Output Undervoltage Lockout With Hysteresis
- Double-Pulse Suppression
TL2845B 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 |
| TL2845BD |
ACTIVE |
-40 to 85 |
0.44 | 1ku |
SOIC (D) | 14 |
50 | TUBE |
TL2845BD |
| TL2845BD-8 |
ACTIVE |
-40 to 85 |
0.49 | 1ku |
SOIC (D) | 8 |
75 | TUBE |
TL2845BD |
| TL2845BDE4 |
ACTIVE |
-40 to 85 |
0.44 | 1ku |
SOIC (D) | 14 |
50 | TUBE |
TL2845BD |
| TL2845BDE4-8 |
ACTIVE |
-40 to 85 |
0.49 | 1ku |
SOIC (D) | 8 |
75 | TUBE |
TL2845BD |
| TL2845BDG4 |
ACTIVE |
-40 to 85 |
0.44 | 1ku |
SOIC (D) | 14 |
50 | TUBE |
TL2845BD |
| TL2845BDG4-8 |
ACTIVE |
-40 to 85 |
0.49 | 1ku |
SOIC (D) | 8 |
75 | TUBE |
TL2845BD |
| TL2845BDR |
ACTIVE |
-40 to 85 |
0.40 | 1ku |
SOIC (D) | 14 |
2500 | LARGE T&R |
TL2845BD |
| TL2845BDR-8 |
ACTIVE |
-40 to 85 |
0.40 | 1ku |
SOIC (D) | 8 |
2500 | LARGE T&R |
TL2845BD |
| TL2845BDRE4 |
ACTIVE |
-40 to 85 |
0.40 | 1ku |
SOIC (D) | 14 |
2500 | LARGE T&R |
TL2845BD |
| TL2845BDRE4-8 |
ACTIVE |
-40 to 85 |
0.40 | 1ku |
SOIC (D) | 8 |
2500 | LARGE T&R |
TL2845BD |
| TL2845BDRG4 |
ACTIVE |
-40 to 85 |
0.40 | 1ku |
SOIC (D) | 14 |
2500 | LARGE T&R |
TL2845BD |
| TL2845BDRG4-8 |
ACTIVE |
-40 to 85 |
0.40 | 1ku |
SOIC (D) | 8 |
2500 | LARGE T&R |
TL2845BD |
| TL2845BP |
ACTIVE |
-40 to 85 |
0.48 | 1ku |
PDIP (P) | 8 |
50 | TUBE |
TL2845BP |
| TL2845BPE4 |
ACTIVE |
-40 to 85 |
0.48 | 1ku |
PDIP (P) | 8 |
50 | TUBE |
TL2845BP |
TL2845B 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 |
| TL2845BD |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845BD |
| TL2845BD-8 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845BD-8 |
| TL2845BDE4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845BDE4 |
| TL2845BDE4-8 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845BDE4-8 |
| TL2845BDG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
TL2845BDG4 |
TL2845BDG4 |
| TL2845BDG4-8 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845BDG4-8 |
| TL2845BDR |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845BDR |
| TL2845BDR-8 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845BDR-8 |
| TL2845BDRE4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845BDRE4 |
| TL2845BDRE4-8 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845BDRE4-8 |
| TL2845BDRG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
TL2845BDRG4 |
TL2845BDRG4 |
| TL2845BDRG4-8 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845BDRG4-8 |
| TL2845BP |
Pb-Free (RoHS) |
CU NIPDAU |
N/A for Pkg Type |
|
TL2845BP |
| TL2845BPE4 |
Pb-Free (RoHS) |
CU NIPDAU |
N/A for Pkg Type |
|
TL2845BPE4 |
TL2845B 应用技术支持与电子电路设计开发资源下载
- TL2845B 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)
TL2845B 工具与软件