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LM2403 数据表(PDF) 8 Page - Texas Instruments |
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LM2403 数据表(HTML) 8 Page - Texas Instruments |
8 / 15 page OBSOLETE LM2403 SNOS019B – AUGUST 1999 – REVISED APRIL 2013 www.ti.com Operation with VCC = 70V The closed loop topography of the LM2403 allows operation down to 10V above ground. If the user can limit the white level between 10V and 20V, then operation with VCC = 70V is possible. Operating the LM2403 with VCC = 70V will require the same current even though the supply voltage has dropped by 12.5%. This results in a power savings of 12.5% (as high a 1.5W), allowing a reduction in the size of the heatsink. Figure 9 shows the output waveform of the LM2403 operating at a white level of 15V, and a peak-to-peak output swing of 40V. Below is a summary of the LM2403 rise and fall times with various output offset levels with VCC = 70V. Output Swing Rise Time Fall Time 10V–50V 4.0 ns 5.0 ns 15V–55V 4.2 ns 4.8 ns 20V–60V 4.4 ns 5.0 ns THERMAL CONSIDERATIONS Figure 5 shows the performance of the LM2403 in the test circuit shown in Figure 3 as a function of case temperature. The figure shows that the speed of the LM2403 decreases by less than 10% as the case temperature increases from 50°C to 100°C. This corresponds to a speed degradation of 2% for every 10°C rise in case temperature. Figure 7 shows the total power dissipation of the LM2403 vs. Frequency when all three channels of the device are driving an 8 pF load with a 40Vp-p signal. The graph assumes a 72% active time (device operating at the specified frequency) which is typical in a monitor application. The other 28% of the time the device is assumed to be sitting at the black level (65V in this case). This graph gives the designer the information needed to determine the heat sink requirement for his application. The designer should note that if the load capacitance is increased the AC component of the total power dissipation will also increase. The LM2403 case temperature must be maintained below 100°C. If the maximum expected ambient temperature is 50°C and the maximum power dissipation is 12W, then a maximum heat sink thermal resistance can be calculated: (1) This example assumes a capacitive load of 8 pF and no resistive load. TYPICAL APPLICATION A typical application of the LM2403 is shown in Figure 12. Used in conjunction with an LM1283, a complete video channel from monitor input to CRT cathode can be achieved. Performance is satisfactory for resolutions up to 1600 x 1200 and pixel clock frequencies up to 160 MHz. Figure 12 is the schematic for the TI demonstration board that can be used to evaluate the LM1283/2403 combination in a monitor. PC BOARD LAYOUT CONSIDERATIONS For optimum performance, an adequate ground plane, isolation between channels, good supply bypassing and minimizing unwanted feedback are necessary. Also, the length of the signal traces from the preamplifier to the LM2403 and from the LM2403 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. “Guide to CRT Video Design”, Texas Instruments Application Note 861. “Video Amplifier Design for Computer Monitors”, Texas Instruments 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. 8 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM2403 |
类似零件编号 - LM2403 |
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类似说明 - LM2403 |
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