LT1249 Power Factor Controller
The 8-pin LT®1249 provides active power factor correction for universal offline power systems with very few external parts. By using fixed high frequency PWM current averaging without the need for slope compensation, the LT1249 achieves far lower line current distortion, with a smaller magnetic element than systems that use either peak current detection or zero current switching approach, in both continuous and discontinuous modes of operation.
The LT1249 uses a multiplier containing a square gain function from the voltage amplifier to reduce the AC gain at light output load and thus maintains low line current distortion and high system stability. The LT1249 also provides filtering capability to reject line switching noise which can cause instability when fed into the multiplier. Line current dead zone is minimized with low bias voltage at the current input to the multiplier.
The LT1249 provides many protection features including peak current limiting and overvoltage protection. The switching frequency is internally set at 100kHz.
While the LT1249 simplifies PFC design with minimal parts count, the LT1248 provides flexibilities in switching frequency, overvoltage and current limit
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LT1249 订购信息和价格参考Package Variations and Pricing
| 器件型号 | 封装 | 引脚 | 温度 | 价格 (以 1 ~ 99 片为批量) | 价格 (以 1000 片为批量) * |
| LT1249CN8 | PDIP | 8 | C | $4.17 | $3.25 |
| LT1249CN8#PBF | PDIP | 8 | C | $4.17 | $3.25 |
| LT1249CS8 | SO | 8 | C | $4.50 | $3.50 |
| LT1249CS8#PBF | SO | 8 | C | $4.50 | $3.50 |
| LT1249CS8#TR | SO | 8 | C | $3.56 | |
| LT1249CS8#TRPBF | SO | 8 | C | $3.56 | |
| LT1249IN8 | PDIP | 8 | I | $4.75 | $3.70 |
| LT1249IN8#PBF | PDIP | 8 | I | $4.75 | $3.70 |
| LT1249IS8 | SO | 8 | I | $5.56 | $4.00 |
| LT1249IS8#PBF | SO | 8 | I | $5.56 | $4.00 |
| LT1249IS8#TR | SO | 8 | I | $4.06 | |
| LT1249IS8#TRPBF | SO | 8 | I | $4.06 |
LT1249 数据手册及相关资料下载
- 数据手册(英文) : LT1249 - Power Factor Controller.PDF
- 可靠性数据 : R293 Reliability Data .PDF
