高性能电流模式控制器

概览

UC3842B、UC3843B 系列为高性能固定频率电流模式控制器。此类器件专门针对离线和 DC-DC 转换器应用而设计,为设计人员提供了外部部件极少的成本高效方案。这些集成电路具有振荡器、温度补偿参考、高增益误差放大器、电流传感比较器和高电流图腾柱输出,适用于驱动功率 MOSFET。还包括了保护功能,有输入和参考欠压锁定且均具有迟滞、按周期电流限制、用于单脉冲计量的锁存,以及每隔一个振荡器周期即对输出进行间隔关断的触发器,可将输出停滞时间编程为 50% 到 70%。此类器件采用 8 引脚双列直插塑料封装以及 14 引脚塑料表面贴装 (SO-14) 封装。SO-14 封装具有单独的电源和接地引脚用于图腾柱输出级。UCX844 的 UVLO 阈值为 16 V(开)和 10 V(关),适用于离线转换器。UCX845 针对 UVLO 阈值为 8.5 V(开)和 7.6 V(关)的低电压阈值而量身定制。

  • Current Mode Operation to 500 kHz Output Switching Frequency
  • Output Deadtime Adjustable from 50% to 70%
  • Automatic Feed Forward Compensation
  • Latching PWM for Cycle-By-Cycle Current Limiting
  • Internally Trimmed Reference with Undervoltage Lockout
  • High Current Totem Pole Output
  • Input Undervoltage Lockout with Hysteresis
  • Low Startup and Operating Current
  • Pb-Free Packages are Available

Tools and Resources

Product services, tools and other useful resources related to UC3844

Buy/Parametrics Table

搜寻

Close Search

产品:

0

分享

产品系列:

可订购器件:

0

产品

状态

CAD Models

Hmmm...
We're sorry, we couldn't find any matches for that search term.
Double check your search for any typos or spelling errors or try a different search term.

Show More

1-25 of 25

Products per page

Jump to :

contact sales icon

Support on the go

Find and compare products, get support and connect with onsemi sales team.