CVA2415 View Datasheet(PDF) - Calogic, LLC
Part Name
Description
MFG CO.
'CVA2415' PDF : 4 Pages View PDF
CORPORATION
CVA2415
APPLICATION INFORMATION
The CVA2415 is a high voltage triple CRT driver suitable for
VGA, Super VGA, IBM® 8514 1024 x 768 non-interlaced
display applications. The CVA2415 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 1.8W, increasing to 3.2W at minimum
output voltage.
The CVA2415 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 1.8W per channel for a total dissipation
of 5.4W package dissipation. Under white screen conditions,
i.e.: 15V output, dissipation increases to 3W per channel or
9W total. The CVA2415 case temperature must be
maintained below +100oC. If the maximum expected ambient
temperature is +50oC, then a heat sink is needed with thermal
resistance equal to or less than:
Rth
=
(100 − 50oC)
9W
=
5.5oC/W
FIGURE 2. CVA2415 DC Characteristics
90
80
70
VOLTAGE POWER
60
50
40
30
20
10
01234567
INPUT VOLTAGE
The Thermalloy #6400 is one example of a heatsink that
meets this requirement.
The output of CVA2415 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
10ns/DIV
20V
10ns/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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