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LM2403 数据表(PDF) 8 Page - Texas Instruments

部件名 LM2403
功能描述  Monolithic Triple 4.5 nS CRT Driver
Download  15 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM2403 数据表(HTML) 8 Page - Texas Instruments

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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
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Product Folder Links: LM2403


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