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LM2432 データシート(PDF) 8 Page - Texas Instruments

部品番号 LM2432
部品情報  Monolithic Single Channel 37 MHz HDTV CRT Driver
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LM2432 データシート(HTML) 8 Page - Texas Instruments

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OBSOLETE
LM2432
SNOSAL4E – MARCH 2005 – REVISED APRIL 2013
www.ti.com
Figure 13. Recommended Application Circuit
EFFECT OF LOAD CAPACITANCE
Figure 7 shows the effect of increased load capacitance on the speed of the device. The rise and fall time
increase by 7% and 7.5%, respectively, per additional pF above 10 pF.
EFFECT OF OFFSET
Figure 8 shows the variation in rise and fall times when the DC offset of the 110VPP output swing is varied
between 120V and 150VDC. The rise time shows a variation of less than 10% relative to the center data point
(135VDC). The fall time shows a variation of 14% relative to the center data point.
THERMAL CONSIDERATIONS
Figure 9 shows the performance of the LM2432 as a function of case temperature. The figure shows that the rise
and fall times of the LM2432 increase by approximately 17% and 20%, respectively, as the case temperature
increases from 40°C to 90°C. This corresponds to a speed degradation of only 3.5% and 4.0% for every 10°C
rise in case temperature.
POWER DISSIPATION AND HEATSINK CALCULATION
Worst-Case Power Dissipation
Figure 10 shows the maximum power dissipation of the LM2432 vs. square wave frequency when the device
uses VCC of 220V and is driving a 10 pF load with 110VPP swing alternating one pixel on, one pixel off signal.
Note that the frequency range shown in the power dissipation figure is one-half the actual pixel frequency. The
graph assumes 80% active time (device operating at the specified frequency), which is typical in a HDTV
application. The other 20% of the time the device is assumed to be sitting at the black level (190V in this case).
Under these worst-case condition, the maximum power dissipated by the LM2432 is about 8.9W at around 30
MHz. It is important to note that this power dissipation is a result of a high frequency square wave input, which is
unrealistic in practical TV applications. The bandwidth of the input source used to drive the LM2432 was over
300 MHz. Using a RGB video processor or preamplifier with less bandwidth may cause the LM2432 to dissipate
less power than shown in Figure 10 at the same conditions.
A Practical Approach to Power Dissipation
The power curve (Figure 10) mentioned previously shows the LM2432 power dissipation for square wave
frequencies ranging from 1 to 50 MHz at 110VPP swing. In practice, it is unrealistic for a TV to display average
frequency content over the entire picture exceeding 20 MHz. Therefore, it is important to establish the worst-case
picture condition under normal viewing to give a realistic maximum power dissipation for the LM2432. Here is
one approach:
8
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Product Folder Links: LM2432


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