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LM2438T Folha de dados(PDF) 7 Page - National Semiconductor (TI) |
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LM2438T Folha de dados(HTML) 7 Page - National Semiconductor (TI) |
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7 / 11 page  Application Hints (Continued) NSC DEMONSTRATION BOARD Figure 12 shows the routing and component placement on the NSC LM1279/2438 demonstration board. The schematic of the board is shown in Figure 11. This board provides a good example of a layout that can be used as a guide for fu- ture layouts. Note the location of the following components: • C54, C56 — V CC bypass capacitor, located very close to pin 4 and ground pins • C43, C44 — V BB bypass capacitors, located close to pin 8 and ground • C53, C55 — Additional V CC bypass capacitors, near LM2438 and V CC clamp diodes. Very important for arc protection. The routing of the LM2438 outputs to the CRT is very critical to achieving optimum performance. Figure 13 shows the routing and component placement from pin 1 of the LM2438 to the red cathode. Note that the components are placed so that they almost line up from the output pin of the LM2438 to the red cathode pin of the CRT connector. This is done to minimize the length of the video path between these two components. Note also that D16, D17, R21 and D9 are placed to minimize the size of the video nodes that they are attached to. This minimizes parasitic capacitance in the video path and also enhances the effectiveness of the pro- tection diodes. The anode of protection diode D17 is con- nected directly to a section of the the ground plane that has a short and direct path to the LM2438 ground pins. The cath- ode of D16 is connected to V CC very close to decoupling ca- pacitor C53 (see Figure 13) which is connected to the same section of the ground plane as D17. The diode placement and routing is very important for minimizing the voltage stress on the LM2438 during an arcover event. Lastly, notice that S1 is placed very close to the red cathode and is tied di- rectly to CRT ground. DS101043-15 FIGURE 10. Waveform at Cathode with LM1279/243X Demo Board www.national.com 7 |
Nº de peça semelhante - LM2438T |
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Descrição semelhante - LM2438T |
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