UC1844A 电流模式 PWM 控制器
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 | |
| Topology | Boost, Flyback, Forward |
| Control Method | Current |
| Duty Cycle (Max) (%) | 50 |
| Frequency (Max) (kHz) | 450 |
| UVLO Thresholds On/Off (V) | 16/10 |
| Pin/Package | 20LCCC, 8CDIP |
| Vin (Min) (V) | 10 |
| Vin (Max) (V) | 30 |
| Regulated Outputs (#) | 1 |
| Operating Temperature Range (C) | -55 to 125 |
| Rating | Military |
UC1844A 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
UC1844A 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 |
| 5962-8670407PA | ACTIVE | -55 to 125 | 9.85 | 100u | CDIP (JG) | 8 | 1 | TUBE | |
| 5962-8670407XA | ACTIVE | -55 to 125 | 16.21 | 100u | LCCC (FK) | 20 | 1 | TUBE | |
| UC1844AJ | ACTIVE | -55 to 125 | 6.06 | 100u | CDIP (JG) | 8 | 1 | TUBE | |
| UC1844AJ883B | ACTIVE | -55 to 125 | 9.85 | 100u | CDIP (JG) | 8 | 1 | TUBE | |
| UC1844AL883B | ACTIVE | -55 to 125 | 16.21 | 100u | LCCC (FK) | 20 | 1 | TUBE |
UC1844A 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 |
| 5962-8670407PA | TBD | Call TI | Call TI | 5962-8670407PA | 5962-8670407PA |
| 5962-8670407XA | TBD | Call TI | Call TI | 5962-8670407XA | 5962-8670407XA |
| UC1844AJ | TBD | A42 | N/A for Pkg Type | UC1844AJ | UC1844AJ |
| UC1844AJ883B | TBD | A42 | N/A for Pkg Type | UC1844AJ883B | UC1844AJ883B |
| UC1844AL883B | TBD | POST-PLATE | N/A for Pkg Type | UC1844AL883B | UC1844AL883B |
UC1844A 工具与软件
| 培训内容 | 型号 | 软件/工具类型 |
| 最常用开关模式电源的功率级设计器 | POWERSTAGE-DESIGNER | 分析软件 |
UC1844A 应用技术支持与电子电路设计开发资源下载
- UC1844A数据资料 dataSheet 下载.PDF
- TI 德州仪器电源管理选型与价格参考 . xls
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- U-111, Practical Considerations in Current Mode Power Supplies
- DN-54 Innovative Buck Regulator Uses High Side N-Channel Switch Without Complex
- DN-46 Highly Efficient Low Power DC to DC Inverter Converts +5V Input to -3V Out
