Linear LTC2975四路PMBus电源系统管理方案

Linear公司的LTC2975是四路PMBus电源系统管理器,具有精确的输入电流和能量测量,用来确序,调整(伺服),留余量,监测,管理故障,和提供遥测和创建故障记录.I2C/SMBus串口, 3.3V或4.5V-15V供电,主要用在计算机和网络服务器,工业测试和测量,高可靠系统,视频和医疗图像.本文介绍了LTC2975主要特性,框图和应用电路,以及评估系统DC2022A 主要特性, 简化框图,电路图和材料清单,PCB元件布局图.
The LTC®2975 is a 4-channel Power System Manager used to sequence, trim (servo), margin, supervise, manage faults, provide telemetry and create fault logs. PMBus commands support power supply sequencing, precision point-of-load voltage adjustment and margining. DACs use a proprietary soft-connect algorithm to minimize supply disturbances. Supervisory functions include over and under current, voltage and temperature threshold limits for four power supply output channels as well as over and under voltage threshold limits for a single power supply input channel. Programmable fault responses can disable the power supplies with optional retry after a fault is detected.
Faults that disable a power supply can automatically trigger black box EEPROM storage of fault status and associated telemetry. An internal 16-bit ADC monitors four output voltages, four output currents, four external temperatures, input voltage and current, and die temperature. Input power, energy, and output power is also calculated. A programmable watchdog timer monitors microprocessor activity for a stalled condition and resets the microprocessor if necessary. A single wire bus synchronizes power supplies across multiple LTC Power System Management (PSM) devices. Configuration EEPROM supports autonomous operation without additional software.
LTC2975主要特性:
 Sequence, Trim, Margin and Supervise Four Power Supplies
 Manage Faults, Monitor Telemetry and Create Fault Logs
 PMBus™ Compliant Command Set
 Supported by LTpowerPlay™ GUI
 Margin or Trim Supplies to Within 0.25% of Target
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