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  • Closed-loop System

    Underfill closed-loop control & spray nozzle

    The goal of any electrical or electronic control system is to measure, monitor, and control a process and one way in which we can accurately control the process is by monitoring its output and “feeding” some of it back to compare the actual output with the desired output so as to reduce the error and if disturbed, bring the output of the system back to the original or desired response.

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    Closed-loop System

    The quantity of the output being measured is called the “feedback signal”, and the type of control system which uses feedback signals to both control and adjust itself is called a Closed-loop System.

    Close loop system thumbnail 02 - Closed-loop System
    Quality at source thumbnail 02 - Closed-loop System

    The Underfill process

    The Underfill process consists of dispensing a void-free fluid to encapsulate the bottom side of a silicon die or BGA device. Encapsulation covers the top surface, typically where fragile interconnects are located, but in the case of Underfill, the fragile interconnects are located on the underside of the component.

    Spray nozzles

    Underfilling in combination with the best in class spray nozzles enhances the connection strength of electrical contacts and compensates for differences in thermal expansion rates of the two joining materials that could lead to product failure. Underfill is typically used for applications in high shock environments or when consistent reliability is required.

    Close loop system thumbnail 03 1 - Closed-loop System

    Related Case Studies

    Case Study 1

    Case Study 2

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