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LM2462 Scheda tecnica(PDF) 7 Page - National Semiconductor (TI) |
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LM2462 Scheda tecnica(HTML) 7 Page - National Semiconductor (TI) |
7 / 11 page Application Hints (Continued) NSC DEMONSTRATION BOARD Figure 12 shows the routing and component placement on the NSC LM126X/246X demonstration board. The sche- matic of the board is shown in Figure 10 and Figure 11. This board provides a good example of a layout that can be used as a guide for future layouts. Note the location of the follow- ing components: • C16, C19 — V CC bypass capacitor, located very close to pin 4 and ground pins • C17, C20 — V BB bypass capacitors, located close to pin 8 and ground • C46, C47, C48 — V CC bypass capacitors, near LM2462 and V CC clamp diodes. Very important for arc protection. The routing of the LM2462 outputs to the CRT is very critical to achieving optimum performance. Figure 13 shows the routing and component placement from pin 1 of the LM2462 to the blue cathode. The white line through the PCB traces show the path of the blue video. Note that the components are placed so that they almost line up from the output pin of the LM2462 to the blue cathode pin of the CRT connector. This is done to minimize the length of the video path be- tween these two components. Note also that D8, D9, R24 and D6 are placed to minimize the size of the video nodes that they are attached to. This minimizes parasitic capaci- tance 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 ground plane that has a short and direct path to the LM2462 ground pins. The cathode of D9 is connected to V CC very close to decoupling capacitor C48 (see Figure 13) which is connected to the same section of the ground plane as D8. The diode place- ment and routing is very important for minimizing the voltage stress on the LM2462 during an arc-over event. Lastly, no- tice that S3 is placed very close to the blue cathode and is tied directly to CRT ground. www.national.com 7 |
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