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LM2432 bảng dữ liệu(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LM2432
Giải thích chi tiết về linh kiện  220V Monolithic Single Channel 37 MHz HDTV CRT Driver
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Application Hints (Continued)
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 110V
PP output swing is varied between
120V and 150V
DC. The rise time shows a variation of less
than 10% relative to the center data point (135V
DC). 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
V
CC 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 dissi-
pation is a result of a high frequency square wave input,
which is unrealistic in practical TV applications. The band-
width 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 110V
PP 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 dissipa-
tion for the LM2432. Here is one approach:
A HDTV signal generator pattern that yields a practical
worst-case picture condition is a “multi-burst” pattern that
consists of a 1-to-30 MHz sine wave sweep over each of the
active lines. The power dissipated by the LM2432 as a result
of this picture condition can be approximated by taking the
average of the power between 1 to 30 MHz in Figure 10. This
average is 7W. Because a square wave input was used to
generate this power curve, a sine wave would cause the
LM2432 to dissipate slightly less power, probably about
6.7W. This is one common way to determine a practical
figure for maximum power dissipation. It is the system de-
signer’s responsibility to establish the worst-case picture
condition for his particular application and measure dissipa-
tion under that condition to choose a proper heatsink.
Heatsink Calculation Example
Once the maximum dissipation is known, Figure 11 can be
used to determine the heatsink requirement for the LM2432.
If the 1-to-30 MHz multi-burst test described previously is
assumed to be worst-case picture condition that yields maxi-
mum dissipation, then the LM2432 will dissipate about 6.7W.
The power derating curve shows that the maximum allowed
case temperature is 120˚C when 6.7W is dissipated. If the
maximum expected ambient temperature is 65˚C, then the
maximum thermal resistance from device case-to-sink (
θ
CS)
can be calculated:
θ
CS =(TCMAX –TAMAX)/PDMAX
θ
CS = (120˚C – 65˚C) / 6.7W = 8.2˚C/W
This example assumes a capacitive load of 10 pF and no
resistive load. The designer should note that if output swing,
V
CC supply voltage, input bandwidth, or load capacitance is
increased, then the AC component of the total power dissi-
pation will also increase.
20137710
FIGURE 13. Recommended Application Circuit
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Số phần tương tự - LM2432

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LM2432 TI1-LM2432 Datasheet
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Mô tả tương tự - LM2432

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Texas Instruments
LM2432 TI1-LM2432 Datasheet
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[Old version datasheet]   Monolithic Single Channel 37 MHz HDTV CRT Driver
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