Important Notes for TVS placement in the Circuit
Important Notes for TVS placement in the Circuit
1. Grounding, Rules of Thumb
• Use Multilayer PCB w/ internal ground planes
• Ground Rings: > 2.5 mm wide
• Power traces next to ground traces
• Connect power ground to edge connector
• Design low impedance grounds
• Use TVS from power pin to PCB ground
2. Shielding Material:
• Metal Enclosure / Case
• Conductive Filled Plastics
• Conductive Paint
3.) PCB Trace Design (layout)
• 120V = > 1.5mm
• 1500V = > 2.2 mm
• 20000V = > 20 mm
4.) PCB Connectors
• Recommend Shielded Female type
• Mount in center of card edge
• Connect cable shield to circuit ground
5.) EMC / EMI Coupling Path
• Minimize Current Loop areas
• Reduce……
