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CVA2405T Datasheet(PDF) 3 Page - Calogic, LLC

Part No. CVA2405T
Description  Low Cost Triple CRT Driver
Download  4 Pages
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Maker  CALOGIC [Calogic, LLC]
Homepage  http://www.calogic.net
Logo CALOGIC - Calogic, LLC

CVA2405T Datasheet(HTML) 3 Page - Calogic, LLC

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CVA2405T
CORPORATION
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
APPLICATION INFORMATION
The CVA2405T is a high voltage triple CRT driver suitiable to
drive 69kHz, 1280 x 1024 CRT displays. It features a high
impedance input to match any pre-amplifier. The CVA2405T
has a true class AB output stage that results in excellent gray
scale linearity and consistent EMI performance.
As with any high speed amplifier used in CRT display
applications, specific precaution should be taken to get the
required performance. Power supply should be by pass as
close to the device pin as possible. Use 0.01
µf very near to
the device and a large capacitor of 10
µf or more (preferable
100
µf) near the device. A 0.1µf and 10µf should be connected
near the Vbias pin (#10). Arc protection is very essential. Fast
diodes together with the spark gap will achieve sufficient
protection. However, in certain applications depends on the
tubes a high value of resistor is required to reduce the current
into the CVA2405T during arcing. This will result in less than
desireable performance some of which can be restored by
using a peaking inductor at the output pin,
Figure 2. Another
way to achieve this is by using a RC network at the output of
the device and use a peaking inductor at the tube,
Figure 3.
The rise and fall time of the CVA2405T may suffer due to
stray capacitances associated with the PC Board and other
components. It can be improved by carefully designing the
PC Board where the output stage and input stage ground path
are seperated. Calogic will assist customers in the layout of
the PC Board that will result in quick EMI passage and better
performance.
The output peaking should be used only to
restore the performance loss due to stray capacitances. Over
peaking will cause excessive ringing that will have better
results but poor EMI. The DC restore circuit is also important
when considering the high frequency performance.
Using
CVA4501, DC Bias IC, better results can be obtained and
high frequency performance can be maximixed.
THERMAL CONSIDERATIONS
Power supply current increases as the input signal increases
and consequently power dissipation also increases.
The CVA2405T cannot be used without heat sinking.
Figure 4
shows the power dissipated in each channel over the
operating voltage range of the device. Under white screen
conditions, i.e.: 25V output, dissipation increases to 10.8W
total. The CVA2405T case temperature must be maintained
below
+100
oC.
If
the
maximum
expected
ambient
temperature is +50
oC, then a heat sink is needed with thermal
resistance equal to or less than:
Rth
= (
100
− 50oC)
10.8W
= 4.6oC/W
The CVA2405T maximum load is 600
Ω to ground or V+.
The output of CVA2405T is not short circuit proof. Any resistance
to V
+ or Ground should be > 600Ω.
FIGURE 2.
1P-15
VBIAS
VIDEO
CVA2405T
+80V
L
R
91
SPARK
GAP
33
FIGURE 3.
1P-16
VBIAS
VIDEO
CVA2405T
+80V
1K
SPARK
GAP
33
C
CVA4501
BIAS
DC BIAS
I.C.
Vcc
L
R


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