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LM2467 Fiches technique(PDF) 7 Page - National Semiconductor (TI) |
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LM2467 Fiches technique(HTML) 7 Page - National Semiconductor (TI) |
7 / 12 page Application Hints (Continued) provides a good example of a layout that can be used as a guide for future layouts. Note the location of the following components: • C19—V CC bypass capacitor, located very close to pin 4 and ground pins • C20—V BB bypass capacitors, located close to pin 8 and ground • C46, C47, C48 — V CC bypass capacitors, near LM2467 and V CC clamp diodes. Very important for arc protection. The routing of the LM2467 outputs to the CRT is very critical to achieving optimum performance. Figure 13 shows the routing and component placement from pin 1 of the LM2467 to the blue cathode. Note that the components are placed so that they almost line up from the output pin of the LM2467 to the blue cathode pin of the CRT connector. This is done to minimize the length of the video path between these two components. Note also that D8, D9, R24 and D6 are placed to minimize the size of the video nodes that they are at- tached to. This minimizes parasitic capacitance in the video path and also enhances the effectiveness of the protection diodes. The anode of protection diode D8 is connected directly to a section of the the ground plane that has a short and direct path to the LM2467 ground pins. The cathode of D9 is connected to V CC very close to decoupling capacitor C19 (see Figure 13) which is connected to the same section of the ground plane as D8. The diode placement and routing is very important for minimizing the voltage stress on the LM2467 during an arcover event. Lastly, notice that S3 is placed very close to the blue cathode and is tied directly to CRT ground. www.national.com 7 |
Numéro de pièce similaire - LM2467 |
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Description similaire - LM2467 |
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