CVA2417TX
CORPORATION
APPLICATION INFORMATION
The CVA2417TX 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 CVA2417TX
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 2.8W, increasing to 4.8W at minimum
output voltage.
The CVA2417TX 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 2.8W per channel for a total dissipation
of 8.4W package dissipation. Under white screen conditions,
i.e.: 15V output, dissipation increases to 4.8W per channel or
14.4W total. The CVA2417TX case temperature must be
maintained below +100
o
C. If the maximum expected ambient
temperature is +50
o
C, then a heat sink is needed with thermal
resistance equal to or less than:
R
th
=
FIGURE 2. CVA2417TX DC Characteristics
5
OUTPUT VOLTAGE (VOLTS)
90
80
70
60
50
40
30
20
10
1
VOLTAGE
POWER
3
4
POWER DISSIPATION (WATTS)
2
0
1
2
3
4
5
6
7
1H-43
INPUT VOLTAGE
The Thermalloy #14754 is one example of a heatsink that
meets this requirement.
The CVA2417TX maximum load is 600Ω to ground or V
+
.
The output of CVA2417TX is not short circuit proof.
resistance to V
+
or Ground should be > 600Ω.
Any
(
100
−
50 C)
o
14.4W
=
3.5
o
C/W
FIGURE 3.
FALL TIME
80V
80V
RISE TIME
0dB
BANDWIDTH
10V
5ns/DIV
10V
5ns/DIV
GAIN
10dB/DIV
VOLTS
10V/DIV
VOLTS
10V/DIV
1
10
MHz
100
CALOGIC CORPORATION,
237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CALOGIC [ CALOGIC, LLC ]
