поискавой системы для электроныых деталей |
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LM2412A датащи(PDF) 6 Page - National Semiconductor (TI) |
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LM2412A датащи(HTML) 6 Page - National Semiconductor (TI) |
6 / 11 page Application Hints (Continued) NSC Demonstration Board Figures 11, 12 show routing and component placement on the NSC LM2202/2412 demonstration board. The schematic of the board is shown in Figure 10. This board provides a good example of a layout that can be used as a guide for future layouts. Note the location of the following compo- nents: • C47 -V CC bypass capacitor, located very close to pin 6 and ground pins. ( Figure 12) • C49 -V BB bypass capacitor, located close to pin 10 and ground. ( Figure 12) • C46 and C77 -V CC bypass capacitors, near LM2412A and V CC clamp diodes. Very important for arc protection. ( Figure 11) The routing of the LM2412A outputs to the CRT is very critical to achieving optimum performance. Figure 13 shows the routing and component placement from pin 1 to the blue cathode. Note that the components are placed so that they almost line up from the output pin of the LM2412A to the blue cathode pin of the CRT connector. This is done to minimize the length of the video path between these two components. The direct video path is shown in by a dark gray line through the components and the PCB traces. Note also that D24, D25, R58 and D19 are placed to keep the size of the video nodes to a minimum (R58 is located under D19). This mini- mizes parasitic capacitance in the video path and also en- hances the effectiveness of the protection diodes. The traces in the video nodes to these components are shown by the white line. The anode of protection diode D25 is connected directly to the ground plane giving a short and direct path to the LM2412A ground pins. The cathode of D24 is connected to V CC very close to decoupling capacitor C78 (Figure 13) which is connected to the same section of the ground plane as D25. The diode placement and routing is very important for minimizing the voltage stress on the LM2412A during an arc-over event. Lastly, notice that S3 is placed very close to the blue cathode and is tied directly to CRT ground. www.national.com 6 |
Аналогичный номер детали - LM2412A |
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Аналогичное описание - LM2412A |
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