CVA2419 데이터 시트보기 (PDF) - Calogic, LLC
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CVA2419 Datasheet PDF : 4 Pages
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CVA2419TX
CORPORATION
APPLICATION INFORMATION
The CVA2419TX is a high voltage triple CRT driver suitable
for VGA, Super VGA, IBM 8514 1280 x 1024 and 1024 x 768
non-interlaced display applications. The CVA2419TX features
80V operation and low power dissipation. The part is housed
in the industry standard 11 lead TO-220 molded power
package. The heat sink is floating and may be grounded for
ease of manufacturing and RFI shielding.
Thermal Considerations
The transfer characteristics of the amplifier are shown in
Figure 2. Since this is a class A input stage, power supply
current increases as the input signal increases and
consequently power dissipation also increases. Average
dissipation per stage is 2.5W, increasing to 4.4W at minimum
output voltage.
The CVA2419TX cannot be used without heat sinking. Figure
2 shows the power dissipated in each channel over the
operating voltage range of the device, Typical "average"
power dissipation with the device output voltage at one half
the supply voltage is 2.5W per channel for a total dissipation
of 7.5W package dissipation. Under white screen conditions,
i.e.: 20V output, dissipation increases to 5.4W per channel or
16W total. The CVA2419TX case temperature must be
maintained below +90oC. If the maximum expected ambient
temperature is +50oC, then a heat sink is needed with thermal
resistance equal to or less than:
Rth
=
(90 − 50oC)
16W
=
2.5oC/W
FIGURE 2. CVA2419TX DC Characteristics
5
90
80
4
70
VOLTAGE
POWER
60
3
50
40
2
30
20
1
10
01234567
INPUT VOLTAGE
The Thermalloy #14754 is one example of a heatsink that
meets this requirement.
The output of CVA2419TX is not short circuit proof. Any
resistance to V+ or Ground should be > 600Ω.
FIGURE 3.
FALL TIME
80V
RISE TIME
80V
BANDWIDTH
0dB
20V
5ns/DIV
20V
5ns/DIV
1
10
100
MHz
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
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