Offline Controllers | UC3842A
概览
UC3842A、UC3843A 系列高性能固定频率电流模式控制器专门针对离线和 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。这些集成电路具有实现精确占空比控制的微调振荡器、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，包括输入和参考欠压锁定且全部带有磁滞、按周期电流限制、可编程输出停滞时间和用于单脉冲计量的锁存。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。UCX842A 的 UVLO 阈值为 16 V（开）和 10 V（关），适用于离线转换器。UCX843A 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。
- Trimmed Oscillator Discharge Current for Precise Duty Cycle Control
- Current Mode Operation to 500 kHz
- Automatic Feed Forward Compensation
- Latching PWM for Cycle-By-Cycle Current Limiting
- Internally Trimmed Reference with Undervoltage Lockout
- High Current Totem Pole Output
- Undervoltage Lockout with Hysteresis
- Low Startup and Operating Current
- Direct Interface with ON Semiconductor SENSEFET Products
- Pb-Free Packages are Available
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