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LM2436TA 数据表(PDF) 8 Page - National Semiconductor (TI) |
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LM2436TA 数据表(HTML) 8 Page - National Semiconductor (TI) |
8 / 13 page Application Hints (Continued) TABLE 1. LM2436 Cathode Response t r/OS t f/OS Red 7.7 ns / 7% 7.7 ns / 5% Green 7.7 ns / 6% 7.5 ns / 6% Blue 7.4 ns / 7% 7.3 ns / 7% PC BOARD LAYOUT CONSIDERATIONS For optimum performance, an adequate ground plane, iso- lation between channels, good supply bypassing and mini- mizing unwanted feedback are necessary. Also, the length of the signal traces from the preamplifier to the LM2436 and from the LM2436 to the CRT cathode should be as short as possible. The following references are recommended: Ott, Henry W., “Noise Reduction Techniques in Electronic Systems”, John Wiley & Sons, New York, 1976. “Video Amplifier Design for Computer Monitors”, National Semiconductor Application Note 1013. Pease, Robert A., “Troubleshooting Analog Circuits”, Butterworth-Heinemann, 1991. Because of its high small signal bandwidth, the part may oscillate in a monitor if feedback occurs around the video channel through the chassis wiring. To prevent this, leads to the video amplifier input circuit should be shielded, and input circuit wiring should be spaced as far as possible from output circuit wiring. NSC DEMONSTRATION BOARD Figure 12 shows the routing and component placement on the NSC LM1279/2436 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 future layouts. Note the location of the following compo- nents: • C55—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–C56 — V CC bypass capacitors, near LM2436 and V CC clamp diodes. Very important for arc protection. The routing of the LM2436 outputs to the CRT is very critical to achieving optimum performance. Figure 13 shows the routing and component placement from pin 1 of the LM2436 to the blue cathode. Note that the components are placed so that they almost line up from the output pin of the LM2436 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 D14, D15, R29 and D13 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 D14 is con- nected directly to a section of the the ground plane that has a short and direct path to the LM2436 ground pins. The cathode of D15 is connected to V CC very close to decoupling capacitor C55 (see Figure 13) which is connected to the same section of the ground plane as D14. The diode place- ment and routing is very important for minimizing the voltage stress on the LM2436 during an arcover event. Lastly, notice that S3 is placed very close to the blue cathode and is tied directly to CRT ground. 20043521 Red Cathode Response FIGURE 10. www.national.com 8 |
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类似说明 - LM2436TA |
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