VMIVME-7696-650工控机器人备件
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提交文档反馈版权所有©–德克萨斯仪器公司功能框图（续）图功能图图功能图文件夹链接： 版权所有©–德州仪器公司提交文档反馈功能描述启用具有启用引脚允许外部控制信号打开和关闭调节器输出启用开/关阈值没有滞后电压信号必须在接通和断开电压阈值范围内快速干净地上升和下降引脚电压必须高于阈值以确保设备在所有操作条件下都能完全启用引脚电压必须低于阈值以确保设备完全禁用启用引脚没有内部上拉或下拉来建立默认条件因此该引脚必须主动或被动终止如果启用引脚由主动拉高和拉低
电源驱动
则不应允许驱动电压低于接地电位或高于如果应用程序不需要启用功能则引脚应直接连接到引脚热关机保护当结温升至约°时热关机将禁用输出从而使设备冷却当结温度冷却至约°时输出电路启用根据功率分布热阻和环境温度热保护电路可能会循环打开和关闭这种热循环限制了调节器的分布并防止其因过热而损坏的电路设计用于防止临时热过载情况电路不打算取代适当的散热将设备连续运行至热关机会降低设备可靠性折叠电流限制折叠电流限制内置于和中可在输出电压降低时减少可提供的输出电流量负载电流的量取决于和之间的差分电压通常当该差分电压超过
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Submit document feedback Copyright ©– Texas Instruments Functional Block Diagram (continued) Functional Diagram Functional Diagram Folder Link: Copyright ©– Texas Instruments submitted documents Feedback function description Enable with enable pin allows external control signal to open and close regulator output Enable on/off threshold No hysteresis Voltage signal must be within the threshold range of on and off voltage Fast and clean rise and fall pin voltage must be higher than the threshold to ensure that the device can be fully enabled under all operating conditions Pin voltage must be lower than the threshold to ensure that the device can be completely disabled Enable The pin has no internal pull-up or pull-down to establish the default condition, so the pin must be actively or passively terminated if the enabled pin is actively pulled up and pulled down
Power drive
The drive voltage should not be allowed to be lower than the ground potential or higher than the ground potential. If the application does not need to enable the function, the pin should be directly connected to the pin. The thermal shutdown protection will disable the output when the junction temperature rises to about °, so that the equipment can be cooled. When the junction temperature cools to about °, the output circuit is enabled. According to the power distribution, the thermal resistance and the ambient temperature, the thermal protection circuit may cycle to open and close. This thermal cycle limits the distribution of the regulator and prevents its failure The circuit damaged by overheating is designed to prevent temporary thermal overload. The circuit is not intended to replace proper heat dissipation. It can continuously operate the equipment to the thermal shutdown. The reliability of the equipment is reduced. The folding current limit is built into and. It can reduce the available output current when the output voltage is reduced. The amount of load current depends on the differential voltage between and usually when the differential voltage exceeds
