Circuit Break - A MacroFab Podcast

MEP EP#262: Flex PCB Primers

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MEP EP#262: Flex PCB Primers

Parker

  • Robert Feranec
    • Published a video about what to consider when selecting chips for your new board design.
      • Don’t want to steal Robert's content so go check him out.
      • Hardware design and PCB Layout online course
      • Comprehensive Power Supply System Designs for Harsh Automotive Environments Consume Minimal Space, Preserve Battery Charge, Feature Low EMI
        • Analog engineer Bin Wu and previous Linear Tech engineer Zhongming Ye writing an application note with linear tech devices.
        • ‘An Ideal Diode Satisfies Automotive Immunity Norms’
          • LT8672
            • Active rectifier controller
            • Why is all this needed?
              • Car power is dirty
                • Load dumps
                • Cold cranking
                • Pulses
                  • ISO 7632-2 is a negative spike whose peak voltage exceeds −220 V!
                  • Reverse Polarity
                  • AC Ripple

                    • Stephen

                    • Wurth Elektronik on Flex PCBs
                      • Basically Polyimide foil with deposited copper
                      • 3 ways to create a system (from page 2)
                        • Heterogeneous
                        • Homogeneous
                        • Partial Homogeneous
                        • Full flex and Semiflex
                        • Much Much easier way to create a 3d system design
                        • Added benefit of having a full panelized system
                          • Can test a full panel of designs all at once
                          • Test points can technically be on the flex
                          • Break and make
                            • Take the rails off of the PCB
                            • Flex-rigid boards
                              • Can be bonded to external layers
                              • Can be internal
                              • Can be rigid on one side or both
                              • Can be multiple layers
                              • Layout and routing
                                • Create a new layer in your EDA tool to define the Flex portion
                                • No vias in flex portion
                                • Use teardrops for added rigidity
                                • Use wider tracks where possible for added strength
                                • Do not change width in bend area
                                • Distribute conductors evenly
                                • Documentation
                                  • Do it... Do it a lot
                                  • In addition to the PCB gerber or ODB++ files include drawings
                                  • A fab drawing that defines the flex pcb is very helpful
                                    • ...more
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                                    Circuit Break - A MacroFab PodcastBy MacroFab, Inc.
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