CALOGIC CVA2419 Triple 85mhz crt driver Datasheet

Triple 85MHz
CRT Driver
CORPORATION
CVA2419TX
FEATURES
• Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85MHz
• Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . <5.0ns
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 VP-P
• Swing
• Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80V
• Pin to Pin Compatible with CVA2415, CVA2416,
CVA2417, LM2416 and LM2419
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.
APPLICATIONS
Driver for 1280 x 1024 and 1024 x 768 Color
• CRT
Monitors
ORDERING INFORMATION
Part
Package
Temperature
CVA2419TX
T11A
-20oC to +90oC
CONNECTION DIAGRAM
11
10
9
8
7
6
5
4
3
2
1
PIN 1 DESIGNATOR
T11A
V+
VOUT 3
BIAS 3 (12V)
VIN 3
BIAS 2 (12V)
VIN 2
GND
VOUT 2
VOUT 1
BIAS 1 (12V)
VIN 1
CVA2419TX
CORPORATION
ABSOLUTE MAXIMUM RATINGS
Operating Temperature . . . . . . . . . . . . . . . . . -20oC to +90oC
Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC
Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85V
Storage Temperature . . . . . . . . . . . . . . . . . . -25oC to +100oC
DC ELECTRICAL CHARACTERISTICS VS = 80V, CL = 12pF, DCinput bias = 12V, Vin = 3.9V, Vout = 50Vp-p, Tcase = +25oC.
See Figure 1.
SYMBOL
CHARACTERISTICS
MIN
TYP
MAX
UNITS
36
mA
ICC
Supply Current @ 1MHz
28
ICC
Supply Current @ 50MHz
50
VoutDC
Output DC Level
45
50
55
V
AV
Voltage Gain
12
15
17
V
Gain Matching
mA
0.2
dB
AC ELECTRICAL CHARACTERISTICS VS = 80V, CL = 12pF, DCinput bias = 12V, Vin = 3.9V, Vout = 50Vp-p, Tcase = +25oC.
See Figure 1.
SYMBOL
CHARACTERISTICS
MIN
TYP
MAX
UNITS
tr
Rise Time
4.5
6.0
ns
tf
Fall Time
4.9
6.0
ns
BW
Bandwidth
85
MHz
Le
Linearity
6
%
OS
Overshoot
6
%
FIGURE 1. TEST CIRCUIT
12V
C4
C3
C6
R1
Q1
INPUT
C1
R2
R6
R3
11
2,7,9
VCC
Vbias 1/3
CVA2419TX
1,6,8
Vin
D1
C2
VCC
L1
3,4,10
OUTPUT
Vout
R5
R4
CL
D2
5
GND
C1 = 0.01m F
C2 = 1.0m F
C3 = 0.1m F
C4 = 0.47m F
CL = 12pF (Including Parasitics)
C6 = 1.0m F
R1 = 7.5K
R2 = 7.5K
R3 = 10.0K
R4 = 34
R5 = 5.1K
R6 = 180
D1 = FDH400
D2 = FDH400
L1 = 560nH
Q1 = 2N5770
1T-31
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
CVA2419TX
CORPORATION
APPLICATION INFORMATION
FIGURE 2. CVA2419TX DC Characteristics
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
4
80
70
VOLTAGE
60
POWER
3
50
2
40
30
1
20
10
0
1
2
3
4
5
6
POWER DISSIPATION (WATTS)
OUTPUT VOLTAGE (VOLTS)
5
90
7
INPUT VOLTAGE
The Thermalloy #14754 is one example of a heatsink that
meets this requirement.
The output of CVA2419TX is not short circuit proof.
resistance to V+ or Ground should be > 600Ω.
Any
= 2.5oC/W
FIGURE 3.
FALL TIME
80V
RISE TIME
BANDWIDTH
80V
20V
GAIN
5dB/DIV
VOLTS
10V/DIV
VOLTS
10V/DIV
0dB
20V
5ns/DIV
5ns/DIV
1
10
100
MHz
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
CVA2419TX
CORPORATION
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.
FIGURE 4. TYPICAL APPLICATION
VCC
+12V
0.1m F
+
1
28
RED DRIVE
0.1m F
2
27
3
26
100m F
51W
12V
C4
100W
C3
VIDEO
IN
Q1
4
25
0.1m F
10KW
75W
10m F
+ 30W *
VIDEO
IN
24
6
23
7
22
51W
VIDEO
IN
21
9
20
500W
10KW
0.1m F
10m F
TO GREEN
CASCODE
DRIVER
19
10
R6
OUTPUT
C1
R5
R4
CL
D2
DC
RESTORE
11
18
12
17
13
16
D1
C2
Vout
OUTPUT
C1
R5
R4
CL
D2
DC
RESTORE
C3
0.1m F
TO BLUE
CASCODE
DRIVER
390W
14
15
MAX
10KW
MIN
10KW
0.1m F
10KW
10KW
11
VCC
2,7,9
Vbias 1/3
CVA2419TX
1,6,8
Vin
C6
D1
C2
Vout
VCC
L1
3,4,10
OUTPUT
C1
R5
R4
CL
D2
5
GND
DC
RESTORE
BLACK LEVEL
(BRIGHTNESS)
CONTROL
0.1m F
BLACK LEVEL
GATE IN
CVA2419TX
R6
CUTOFF
ADJ.
VCC
L1
3,4,10
12V
C4
91W
+
C6
5
GND
CUTOFF
ADJ.
Q1
CONTRAST
CONTROL
Vout
5
GND
11
VCC
2,7,9
Vbias 1/3
CVA2419TX
1,6,8
Vin
Q1
75W
L1
3,4,10
C3
8
VCC
12V
C4
100W
0.1m F
10m F
+ 30W *
D1
C2
GREEN DRIVE
CVA1203
B
R6
CUTOFF
ADJ.
10KW
75W
TO RED
CASCODE
DRIVER
500W
5
G
VCC
2,7,9
Vbias 1/3
CVA2419TX
1,6,8
Vin
0.1m F
10m F
+ 30W *
R
C6
11
1C-02
C1
µF
C2
µF
C3
µF
C4
µF
CL*
pF
C6
µF
R1
KΩ
R2
KΩ
R3
KΩ
R4
Ω
R5
KΩ
R6
Ω
D1
1.0
1.0
0.1
0.47
12
1.0
7.5
7.5
10.0
34
5.1
180
FDH400
D2
L1
nH
Q1
FDH400 500 2N5770
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
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