汽车平均电流模式控制器

概览

NCV8851-1是一款可调输出、同步降压控制器,可驱动双 N 沟道 MOSFET,非常适合大功率应用。采用平均电流模式控制,基于较宽的输入电压和输出负载范围实现快速瞬变响应和严格的调节。该集成电路结合了内部固定 6.0 V 低漏线性稳压器 (LDO),可为开关模式电源 (SMPS) 的底部门极驱动器提供电荷,从而限制了因过多的门极驱动器而损失的功率。该集成电路设计为在较宽的输入电压范围(4.5 V 至 40 V)内运行,并且能够在 500 kHz 的频率下进行 10:1 的电压转换。控制器的其他特性包括欠压锁定、内部软启动、低静态电流睡眠模式、可编程频率、SYNC(同步)功能、平均电流限制、逐周期过流保护和高温关断。

  • Automotive systems requiring high current
  • Pre-regulated supply for low-voltage SMPSs and LDOs

  • Automotive systems

  • Average current mode control
  • 0.8 V 2% reference voltage
  • Wide input voltage range of 4.5 V to 40 V
  • 6.0 V low-dropout linear regulator (LDO)
  • Input UVLO (Undervoltage Lockout)
  • Internal soft-start
  • 1.0 µA maximum quiescent current in sleep mode
  • Adaptive non-overlap circuitry
  • Programmable fixed frequency 170 kHz to 500 kHz
  • External clock synchronization up to 600 kHz
  • Average current limiting (ACL)
  • Cycle-by-cycle overcurrent protection (OCP)
  • Thermal shutdown (TSD)

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