UC2848 平均电流模式 PWM 控制器
The UC3848 family of PWM control ICs makes primary side average current mode control practical for isolated switching converters. Average current mode control insures that both cycle by cycle peak switch current and maximum average inductor current are well defined and will not run away in a short circuit situation. The UC3848 can be used to control a wide variety of converter topologies.
In addition to the basic functions required for pulse width modulation, the UC3848 implements a patented technique of sensing secondary current in an isolated buck derived converter from the primary side. A current wave-form synthesizer monitors switch current and simulates the inductor current down slope so that the complete current waveform can be constructed on the primary side without actual secondary side measurement
| UC2848 | |
| Control Method | Current |
| Duty Cycle (Max) (%) | 100 |
| Frequency (Max) (kHz) | 450 |
| UVLO Thresholds On/Off (V) | 13/10 |
| Pin/Package | 16SOIC |
| Approx. Price (US$) | 4.05 | 1ku |
| Vin (Min) (V) | 10 |
| Vin (Max) (V) | 22 |
| Regulated Outputs (#) | 1 |
| Operating Temperature Range (C) | -40 to 85 |
| Rating | Military |
UC2848 特性
- Practical Primary Side Control of Isolated Power Supplies with IC Control of Secondary Side Current
- Accurate Programmable Maximum Duty Cycle Clamp
- Maximum Volt-Second Product Clamp to Prevent Core Saturation
- Practical Operation Up to 1MHz
- High Current (2A Pk) Totem Pole Output Driver
- Wide Bandwidth (8MHz) Current Error Amplifier
- Under Voltage Lockout Monitors VCC, VIN and VREF
- Output Active Low During UVLO
- Low Startup Current (500µA)
- Precision 5V Reference (1%)
UC2848 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 |
| UC2848DW | ACTIVE | -40 to 85 | 4.05 | 1ku | SOIC (DW) | 16 | 40 | TUBE | |
| UC2848DWG4 | ACTIVE | -40 to 85 | 4.05 | 1ku | SOIC (DW) | 16 | 40 | TUBE |
UC2848 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 |
| UC2848DW | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | UC2848DW | UC2848DW |
| UC2848DWG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | UC2848DWG4 | UC2848DWG4 |
UC2848 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 |
UC2848 应用技术支持与电子电路设计开发资源下载
- UC2848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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