TL2845 电流模式 PWM 控制器
TL2845 描述
The TL284x and TL384x 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. Some of the internally implemented circuits are an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference 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.
|
TL2842 |
TL2843 |
TL2844 |
TL2845 |
| 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, 8PDIP, 8SOIC |
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 |
TL2845 特性
- Optimized for Off-Line and dc-to-dc Converters
- Low Start-Up Current (<1 mA)
- Automatic Feed-Forward Compensation
- Pulse-by-Pulse Current Limiting
- Enhanced Load-Response Characteristics
- Undervoltage Lockout With Hysteresis
- Double-Pulse Suppression
- High-Current Totem-Pole Output
- Internally Trimmed Bandgap Reference
- 500-kHz Operation
- Error Amplifier With Low Output Resistance
- Designed to Be Interchangeable With UC2842 and UC3842 Series
TL2845 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 |
| TL2845D |
ACTIVE |
-40 to 85 |
0.44 | 1ku |
SOIC (D) | 14 |
50 | TUBE |
TL2845D |
| TL2845D-8 |
ACTIVE |
-40 to 85 |
0.49 | 1ku |
SOIC (D) | 8 |
75 | TUBE |
TL2845D |
| TL2845DE4 |
ACTIVE |
-40 to 85 |
0.44 | 1ku |
SOIC (D) | 14 |
50 | TUBE |
TL2845D |
| TL2845DE4-8 |
ACTIVE |
-40 to 85 |
0.49 | 1ku |
SOIC (D) | 8 |
75 | TUBE |
TL2845D |
| TL2845DG4 |
ACTIVE |
-40 to 85 |
0.44 | 1ku |
SOIC (D) | 14 |
50 | TUBE |
TL2845D |
| TL2845DG4-8 |
ACTIVE |
-40 to 85 |
0.49 | 1ku |
SOIC (D) | 8 |
75 | TUBE |
TL2845D |
| TL2845DR |
ACTIVE |
-40 to 85 |
0.40 | 1ku |
SOIC (D) | 14 |
2500 | LARGE T&R |
TL2845D |
| TL2845DR-8 |
ACTIVE |
-40 to 85 |
0.40 | 1ku |
SOIC (D) | 8 |
2500 | LARGE T&R |
TL2845D |
| TL2845DRE4 |
ACTIVE |
-40 to 85 |
0.40 | 1ku |
SOIC (D) | 14 |
2500 | LARGE T&R |
TL2845D |
| TL2845DRE4-8 |
ACTIVE |
-40 to 85 |
0.40 | 1ku |
SOIC (D) | 8 |
2500 | LARGE T&R |
TL2845D |
| TL2845DRG4 |
ACTIVE |
-40 to 85 |
0.40 | 1ku |
SOIC (D) | 14 |
2500 | LARGE T&R |
TL2845D |
| TL2845DRG4-8 |
ACTIVE |
-40 to 85 |
0.40 | 1ku |
SOIC (D) | 8 |
2500 | LARGE T&R |
TL2845D |
| TL2845P |
ACTIVE |
-40 to 85 |
0.48 | 1ku |
PDIP (P) | 8 |
50 | TUBE |
TL2845P |
| TL2845PE4 |
ACTIVE |
-40 to 85 |
0.48 | 1ku |
PDIP (P) | 8 |
50 | TUBE |
TL2845P |
TL2845 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 |
| TL2845D |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845D |
| TL2845D-8 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845D-8 |
| TL2845DE4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845DE4 |
| TL2845DE4-8 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845DE4-8 |
| TL2845DG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
TL2845DG4 |
TL2845DG4 |
| TL2845DG4-8 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845DG4-8 |
| TL2845DR |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845DR |
| TL2845DR-8 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845DR-8 |
| TL2845DRE4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845DRE4 |
| TL2845DRE4-8 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845DRE4-8 |
| TL2845DRG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
TL2845DRG4 |
TL2845DRG4 |
| TL2845DRG4-8 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
TL2845DRG4-8 |
| TL2845P |
Pb-Free (RoHS) |
CU NIPDAU |
N/A for Pkg Type |
|
TL2845P |
| TL2845PE4 |
Pb-Free (RoHS) |
CU NIPDAU |
N/A for Pkg Type |
|
TL2845PE4 |
TL2845 应用技术支持与电子电路设计开发资源下载
- TL2845 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)
TL2845 工具与软件
