UC3844A 电流模式 PWM 控制器
UC3844A 描述
The UC1842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC3842/3/4/5 family. Providing the necessary features to control current mode switched mode power supplies, this family has the following improved features. Start up current is guaranteed to be less than 0.5mA. Oscillator discharge is trimmed to 8.3mA. During under voltage lockout, the output stage can sink at least 10mA at less than 1.2V for VCC over 5V.
| |
UC1844A |
UC2844A |
UC3844A |
| Topology |
Boost, Flyback, Forward |
Boost, Buck, Flyback, Forward |
Boost, Buck, Flyback, Forward |
| Control Method |
Current Mode |
Current Mode |
Current Mode |
| Duty Cycle(Max)(%) |
50 |
50 |
50 |
| Frequency(Max)(kHz) |
450 |
450 |
450 |
| UVLO Thresholds On/Off(V) |
16/10 |
16/10 |
16/10 |
| Pin/Package |
20LCCC, 8CDIP |
14SOIC, 8PDIP, 8SOIC |
14SOIC, 8PDIP, 8SOIC |
| Regulated Outputs(#) |
1 |
1 |
1 |
| Operating Temperature Range(°C) |
-55 to 125 |
-40 to 125,-40 to 85 |
0 to 70 |
| Rating |
Military |
Catalog |
Catalog |
UC3844A 特性
- Optimized for Off-line and DC to DC Converters
- Low Start Up Current (<0.5mA)
- Trimmed Oscillator Discharge Current
- Automatic Feed Forward Compensation
- Pulse-by-Pulse Current Limiting
- Enhanced Load Response Characteristics
- Under-Voltage Lockout With Hysteresis
- Double Pulse Suppression
- High Current Totem Pole Output
- Internally Trimmed Bandgap Reference
- 500kHz Operation
- Low RO Error Amp
UC3844A 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 |
| UC3844AD |
ACTIVE |
0 to 70 |
0.90 | 1ku |
SOIC (D) | 14 |
50 | TUBE |
UC3844AD |
| UC3844AD8 |
ACTIVE |
0 to 70 |
0.90 | 1ku |
SOIC (D) | 8 |
75 | TUBE |
UC3844AD |
| UC3844AD8G4 |
ACTIVE |
0 to 70 |
0.90 | 1ku |
SOIC (D) | 8 |
75 | TUBE |
UC3844AD |
| UC3844AD8TR |
ACTIVE |
0 to 70 |
0.90 | 1ku |
SOIC (D) | 8 |
2500 | LARGE T&R |
UC3844AD |
| UC3844AD8TRG4 |
ACTIVE |
0 to 70 |
0.90 | 1ku |
SOIC (D) | 8 |
2500 | LARGE T&R |
UC3844AD |
| UC3844ADG4 |
ACTIVE |
0 to 70 |
0.90 | 1ku |
SOIC (D) | 14 |
50 | TUBE |
UC3844AD |
| UC3844ADTR |
ACTIVE |
0 to 70 |
0.90 | 1ku |
SOIC (D) | 14 |
2500 | LARGE T&R |
UC3844AD |
| UC3844ADTRG4 |
ACTIVE |
0 to 70 |
0.90 | 1ku |
SOIC (D) | 14 |
2500 | LARGE T&R |
UC3844AD |
| UC3844AN |
ACTIVE |
0 to 70 |
0.90 | 1ku |
PDIP (P) | 8 |
50 | TUBE |
UC3844AN |
| UC3844ANG4 |
ACTIVE |
0 to 70 |
0.90 | 1ku |
PDIP (P) | 8 |
50 | TUBE |
UC3844AN |
| UC3844AP |
OBSOLETE |
0 to 70 |
|
PDIP (P) | 8 |
|
UC3844AP |
UC3844A 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 |
| UC3844AD |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
|
UC3844AD |
| UC3844AD8 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
|
UC3844AD8 |
| UC3844AD8G4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
UC3844AD8G4 |
UC3844AD8G4 |
| UC3844AD8TR |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
|
UC3844AD8TR |
| UC3844AD8TRG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
UC3844AD8TRG4 |
UC3844AD8TRG4 |
| UC3844ADG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
UC3844ADG4 |
UC3844ADG4 |
| UC3844ADTR |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
|
UC3844ADTR |
| UC3844ADTRG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
UC3844ADTRG4 |
UC3844ADTRG4 |
| UC3844AN |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
|
UC3844AN |
| UC3844ANG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
UC3844ANG4 |
UC3844ANG4 |
UC3844A 应用技术支持与电子电路设计开发资源下载
- UC3844A 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)
UC3844A 工具与软件
