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Электронный компонент: CVA2419

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Triple 85MHz
CRT Driver
CVA2419TX
FEATURES

Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85MHz

Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . <5.0ns

Swing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 V
P-P

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80V

Pin to Pin Compatible with CVA2415, CVA2416,
CVA2417, LM2416 and LM2419
APPLICATIONS

CRT Driver for 1280 x 1024 and 1024 x 768 Color
Monitors
DESCRIPTION
The CVA2419TX contains three wide bandwidth, large signal
amplifiers designed specially to drive high resolution color
monitors. This device will provide excellent drive capability for
the 1280 x 1024 and 1024 x 768 color monitor. The
CVA2419TX is a low cost CRT driver designed to replace
discrete solutions.
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.
ORDERING INFORMATION
Part
Package
Temperature
CVA2419TX
T11A
-20
o
C to +90
o
C
CORPORATION
CONNECTION DIAGRAM
V+
V
BIAS 3 (12V)
V
BIAS 2 (12V)
V
GND
V
V
BIAS 1 (12V)
V
OUT 3
IN 3
IN 2
OUT 2
OUT 1
IN 1
11
10
9
8
7
6
5
4
3
2
1
PIN 1 DESIGNATOR
T11A
ABSOLUTE MAXIMUM RATINGS
Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85V
Storage Temperature . . . . . . . . . . . . . . . . . . -25
o
C to +100
o
C
Operating Temperature . . . . . . . . . . . . . . . . . -20
o
C to +90
o
C
Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . +300
o
C
CVA2419TX
FIGURE 1. TEST CIRCUIT
V
bias
V
in
V
out
GND
R5
C6
C2
C
L
INPUT
R2
R1
C1
R6
D2
D1
L1
C4
12V
C3
Q1
V
CC
R3
R4
OUTPUT
R1 = 7.5K
R2 = 7.5K
R3 = 10.0K
R4 = 34
R5 = 5.1K
R6 = 180
D1 = FDH400
D2 = FDH400
L1 = 560nH
Q1 = 2N5770
C6 = 1.0
m
F
C1 = 0.01
m
F
C2 = 1.0
m
F
C3 = 0.1
m
F
C4 = 0.47
m
F
C = 12pF (Including Parasitics)
L
CVA2419TX
1/3
V
CC
5
GND
2,7,9
1,6,8
3,4,10
11
1T-31
DC ELECTRICAL CHARACTERISTICS V
S
= 80V, C
L
= 12pF, DC
input bias
= 12V, V
in
= 3.9V, V
out
= 50V
p-p
, T
case
= +25
o
C.
See Figure 1.
SYMBOL
CHARACTERISTICS
MIN
TYP
MAX
UNITS
I
CC
Supply Current @ 1MHz
28
36
mA
I
CC
Supply Current @ 50MHz
50
mA
V
outDC
Output DC Level
45
50
55
V
A
V
Voltage Gain
12
15
17
V
Gain Matching
0.2
dB
AC ELECTRICAL CHARACTERISTICS V
S
= 80V, C
L
= 12pF, DC
input bias
= 12V, V
in
= 3.9V, V
out
= 50V
p-p
, T
case
= +25
o
C.
See Figure 1.
SYMBOL
CHARACTERISTICS
MIN
TYP
MAX
UNITS
t
r
Rise Time
4.5
6.0
ns
t
f
Fall Time
4.9
6.0
ns
BW
Bandwidth
85
MHz
Le
Linearity
6
%
OS
Overshoot
6
%
CALOGIC CORPORATION
, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
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 +90
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
=
(
90
-
50
o
C
)
16W
=
2.5
o
C/W
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 > 600
.
FALL TIME
VOLTS
10V/DIV
5ns/DIV
20V
80V
BANDWIDTH
100
MHz
1
10
GA
IN
5dB/DI
V
0dB
RISE TIME
VOLTS
10V/DIV
5ns/DIV
20V
80V
FIGURE 3.
FIGURE 2. CVA2419TX DC Characteristics
CVA2419TX
CALOGIC CORPORATION
, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
INPUT VOLTAGE
OUTPUT V
O
L
T
AGE (VO
LT
S)
0
60
90
3
5
7
POWER DISSI
PA
T
I
ON (WATTS)
1
4
6
2
50
80
40
70
30
20
10
VOLTAGE
POWER
3
4
2
1
5
CORPORATION
FIGURE 4. TYPICAL APPLICATION
TYPICAL APPLICATION
A typical application of the CVA2419TX is shown in
Figure 4.
Used in conjunction with a CVA1203, a complete video
channel from monitor input to CRT cathode is shown. In this
application, feedback is local to the CVA1203. An alternative
scheme would be feedback from the output of the CVA2419 to
the positive clamp inputs of the CVA1203. This would provide
slightly better black level control of the system.
CVA2419TX
1
2
3
4
5
6
7
8
9
10
13
14
11
12
28
27
26
25
24
23
22
21
20
19
16
15
18
17
CVA1203
0.1
m
F
10K
9
10K
9
10K
9
0.1
m
F
0.1
m
F
0.1
m
F
0.1
m
F
0.1
m
F
0.1
m
F
10K
9
0.1
m
F
MAX
MIN
10K
9
BLACK LEVEL
GATE IN
10
m
F
+
10
m
F
75
9
30
W
*
VIDEO
IN
R
+
10
m
F
75
9
30
W
*
VIDEO
IN
G
+
10
m
F
75
9
30
W
*
VIDEO
IN
B
+
CONTRAST
CONTROL
100
m
F
+
100
9
51
9
RED DRIVE
100
9
51
9
GREEN DRIVE
500
W
390
9
500
W
TO RED
CASCODE
DRIVER
TO BLUE
CASCODE
DRIVER
0.1
m
F
BLACK LEVEL
(BRIGHTNESS)
CONTROL
10K
9
10K
9
91
9
CUTOFF
ADJ.
V
CC
+12V
V
bias
V
in
V
out
R5
C6
C2
C
L
R6
D2
D1
L1
C4
12V
C3
Q1
V
CC
V
CC
R4
OUTPUT
5
GND
2,7,9
1,6,8
3,4,10
11
V
bias
V
in
R6
C4
12V
C3
Q1
2,7,9
1,6,8
V
bias
V
in
R6
C4
12V
C3
Q1
2,7,9
1,6,8
1/3
CVA2419TX
V
out
R5
C6
C2
C
L
D2
D1
L1
V
CC
V
CC
R4
OUTPUT
5
GND
3,4,10
11
1/3
CVA2419TX
V
out
R5
C6
C2
C
L
D2
D1
L1
V
CC
V
CC
R4
OUTPUT
5
GND
3,4,10
11
1/3
CVA2419TX
1C-02
CUTOFF
ADJ.
CUTOFF
ADJ.
TO GREEN
CASCODE
DRIVER
DC
RESTORE
C1
DC
RESTORE
DC
RESTORE
C1
C1
CALOGIC CORPORATION
, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
C1
F
C2
F
C3
F
C4
F
CL*
pF
C6
F
R1
K
R2
K
R3
K
R4
R5
K
R6
D1
D2
L1
nH
Q1
CVA2419TX
1.0
1.0
0.1
0.47
12
1.0
7.5
7.5
10.0
34
5.1
180
FDH400
FDH400
500 2N5770
CORPORATION