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LCA05C Scheda tecnica(PDF) 4 Page - Protek Devices |
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LCA05C Scheda tecnica(HTML) 4 Page - Protek Devices |
4 / 5 page LCA05C thru LCA24C 4 05003.R7 2/07 www.protekdevices.com The LCA Series are low capacitance, bidirectional TVS arrays that are designed to protect I/O or high speed data lines from the damaging effects of ESD or EFT. This product series has a surge capability of 800 Watts P PP per line for an 8/20µs waveshape and offers ESD protection > 40kV. BIDIRECTIONAL COMMON-MODE CONFIGURATION (Figure 1) Ideal for use in USB applications, the LCA Series provides up to six (6) lines of protection in a common-mode configuration as depicted in Figure 1. Circuit connectivity is as follows: ✔ Pins 2, 3, 4, 5, 6, and 7 are connected to ground. ✔ Pins 15 and 14 connected to Port #1 D- and D+. ✔ Pins 13 and 12 connected to Port #2 D+ and D-. ✔ Pins 11 and 10 connected to Port #3 D+ and D-. CIRCUIT BOARD LAYOUT RECOMMENDATIONS Circuit board layout is critical for Electromagnetic Compatibility (EMC) protection. The following guidelines are recommended: ✔ The protection device should be placed near the input terminals or connectors. By placing the TVS close to the connectors, the device will divert the transient current immediately before it can be coupled into the nearby traces. ✔ The path length between the TVS devices and the protected line should be minimized ✔ All conductive loops including power and ground loops should be minimized ✔ The transient current return path to ground should be kept as short as possible to reduce parasitic inductance. ✔ Ground planes should be used whenever possible. For Multilayer PCBs, use ground vias. Figure1. Typical Common- Mode USB Protection Circuit D+ D- D+ D- D- D+ USB OUTPUT CONNECTOR USB IC USB OUTPUT CONNECTOR PORT #1 PORT #2 PORT #3 23 15 14 5 10 7 6 11 12 13 4 APPLICATION NOTE |
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