通用开关稳压器子系统

概览

µA78S40 是一款开关稳压器子系统,包括温度补偿电压参比、带有源电流限值电路的受控占空比振荡器、比较器、高电流和高电压输出开关、能够实现 1.5 A 和 40 V 的引脚输入功率二极管,以及无承诺运算放大器,可以独立于集成电源电源进行通电或断电。该开关输出可在需要电压高于 40 V,或电流超过 1.5 A 时驱动外部 NPN 或 PNP 晶体管。功能包括宽电源电压范围、低待机电流、高能效和低漂移。µA78S40 提供商用(0 至 + 70 C)或汽车(-40 至 + 85 C)温度范围。某些应用包括步升、步降和反向稳压器,可在电池供电系统中实现极佳结果。

  • Output Adjustable from 1.25 V to 40 V
  • Peak Output Current of 1.5 A Without External Transistor
  • 80 dB Line and Load Regulation
  • Operation from 2.5 V to 40 V Supply
  • Low Standby Current Drain
  • High Gain, High Output Current, Uncommitted Op Amp Simplified Block Diagram

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