Linear LTC3511高压开关稳压电源解决方案

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  Linear 公司的LTC3511是高压单片开关稳压电源,主要为隔离的反激拓扑而设计.输入电压4.5V到100V,输出功率达2.5W,器件集成了240mA/150V的功率开关,不需要变压器的第三个绕组或光隔离器,也不需要外接起动电阻,主要用在隔离的通信电源,家庭电源和隔离的工业,汽车和医疗电源.本文介绍了LTC3511主要特性,方框图,以及多种典型的应用电路.

  The LT3511 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology.

  No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform. The device integrates a 240mA, 150V power switch, high voltage circuitry, and control into a high voltage 16-lead MSOP package with four leads removed.

  The LT3511 operates from an input voltage range of 4.5V to 100V and delivers up to 2.5W of isolated output power. Two external resistors and the transformer turns ratio easily set the output voltage. Off-the-shelf transformers are available for several applications. The high level of integration and the use of boundary mode operation results in a simple, clean, tightly regulated application solution to the traditionally tough problem of isolated power delivery.

  LTC3511主要特性:

  4.5V to 100V Input Voltage Range

  Internal 240mA, 150V Power Switch

  Boundary Mode Operation

  No Transformer Third Winding or Opto-Isolator Required for Regulation

  Improved Primary-Side Winding Feedback Load Regulation

  VOUT Set with Two External Resistors

  BIAS Pin for Internal Bias Supply and Power Switch Driver

  No External Start-Up Resistor

  16-Lead MSOP Package

  LTC3511应用:

  Isolated Telecom Power Supplies

  Isolated Auxiliary/Housekeeping Power Supplies

  Isolated Industrial, Automotive and Medical Power Supplies

图1.LTC3511方框图

图2.LTC3511输入48V输出5V隔离反激转换器电路图

图3.LTC3511输入48V输出15V隔离反激转换器电路图

图4.LTC3511输入48V输出24V隔离反激转换器电路图

图5.LTC3511输入24V输出5V隔离反激转换器电路图

图6.LTC3511输入24V输出15V隔离反激转换器电路图

图7.LTC3511输入12V输出15V隔离反激转换器电路图

图8.LTC3511输入12V输出+/-70V隔离反激转换器电路图

图9.LTC3511输入43V输出3.3V非隔离反激转换器电路图

图10.LTC3511输入48V输出12V隔离反激转换器电路图

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