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LM1279 データシート(PDF) 10 Page - Texas Instruments |
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LM1279 データシート(HTML) 10 Page - Texas Instruments |
10 / 20 page OBSOLETE LM1279 SNOS020B – SEPTEMBER 1998 – REVISED APRIL 2013 www.ti.com The ESD cells of the LM1279 also gives good tolerance against arc-over. Once again the monitor designer must be careful in his PCB layout for good arc-over protection. In the video chain only the outputs of the CRT driver are directly exposed to the voltages that may occur during arc-over. A good PCB layout is the best protection for the video pre-amp against arc-over. The pre-amp vulnerability is mainly through the ground traces on the PCB. For proper operation all ground connections associated with the video pre-amp, including the grounds to the bypass capacitors, must have short returns to the ground pins. A significant ground plane should be used to connect all the pre-amp grounds. Figure 16, the demo board layout, is an excellent example on an effective ground plane, yet using only a single sided PCB layout. Here is a check list to make sure a PC board layout has good grounding: • All associated grounds with the video pre-amp are connected together through a large ground plane. • CRT driver ground is connected to the video pre-amp ground at one point. • CRT and arc protection grounds are connected directly to chassis, or the main ground. There is no arc-over current flow from these grounds through the pre-amp or CRT driver grounds. If any one of the above suggestions are not followed, then the LM1279 may become vulnerable to arc-over. Improper grounding is by far the most common cause of a video pre-amp failure during arc-over. Figure 6. Recommended Video Input ESD Protection 10 Submit Documentation Feedback Copyright © 1998–2013, Texas Instruments Incorporated Product Folder Links: LM1279 |
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同様の説明 - LM1279 |
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