Low Cost
Triple 65MHz CRT Driver
CVA2415
FEATURES
••Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65MHz
••Rise/ Fa ll Tim e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . <6 .0 ns
••Swing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 VP-P
••Supply V o ltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80V
••Pin to Pin Comp atib le w it h CVA2416 and LM24 16
APPLICATIONS
••CRT Driv er for VG A a nd SVG A Color M o nito rs
DESCRIPTION
The CVA2415 contains three wide bandwidth, large signal
amplifiers designed specially to drive VGA and SVGA color
monitors. The device is a low cost CRT driver designed
especially to r ep lace discr ete so lution s.
The part is housed in the industry standard 11-lead TO-220
molded power package. The heat sink is floating and may be
groun ded for ease of manuf actur ing and RFI shieldin g.
ORDERING INFORMATION
Part Package Temperature
CVA2415T T11A -20oC to +100oC
CORPORATION
CONNECTION DIAGRAM
Discrete Solution Replacement
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 DESIGNATO R
T11A
ABSOLUTE M AXIM UM R A T INGS
Supply V o ltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85V
Storage Temp e rature. . . . . . . . . . . . . . . . . . -25oC to +100oCO per ating Temp era tu re . . . . . . . . . . . . . . . . -20oC to +100 oC
Lead Temper ature . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC
CVA2415
CORPORATION
FIGURE 1. APPLICATION AND TEST CIRCUIT
V
bias
V
in
CVA2415
1/3
V
out
5
GND
R5
C6 C2
C
L
INPUT
R2
R1
C1
R6 D2
D1 L1
C4
12V
C3
Q1
V
CC
V
CC
R3
R4 OUTPUT
R1 = 8.2kΩ
R2 = 2.7kΩ
R3 = 10.0K Ω
R4 = 34Ω
R5 = 1.5kΩ
R6 = 150 Ω
D1 = FDH400
D2 = FDH400
L1 = 560nH
Q1 = 2N5770
C6 = 1.0µF
C1 = 0.01 µF
C2 = 0.01 µF
C3 = 0.1µF
C4 = 0.47 µF
C = 12pF (Including Parasitics)
L
2,7,9
1,6,8
3,4,10
11
DC ELECTRICA L CHARACT ERISTICS VS = 80V, CL = 12pF, Vbias = 12V, Vin = 3.6V, Tcase = +25oC. See Figure 1.
SYMBOL CHARACTERISTICS MIN TYP MAX UNITS
ICC Supply Current @ 1MHz 18 22 26 mA
ICC Supply Current @ 50MHz 40 mA
VoutDC Output DC Level 38 42 46 V
AVVol tage Ga in 11 1 3 15 V
Gain Matching 0.2 dB
AC ELECTRICA L CHARACT ERISTICS VS = 80V, CL = 12pF, Vbias = 12 V, Tcase = +25oC. See Figure 1.
SYMBOL CHARACTERISTICS MIN TYP MAX UNITS
trRi se Time 5 .6 7. 0 ns
tfFall Time 4.5 6.0 ns
BW Bandwidth 65 MHz
Le Linearity 8 %
OS Overshoot 0 %
CALOGIC CORPORATION, 237 W hitney P lace, F r emont, Califo r nia 94 539, Tele ph on e: 5 10-656-2 9 0 0, FAX: 510-6 51 - 10 76
APPLICAT ION 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 di ssipation. The part i s housed in the industry
standard 11 lead TO-220 molded power package. The heat
sink is floating and may be grounded for ease of
manu factur ing and RFI shielding.
Thermal Consi de rati ons
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 wi thou t heat sinking.
Fi gur e 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 to tal 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 . I f the maximum expected ambient
tem per atur e is + 5 0oC, then a heat s ink is ne ede d with t her m al
resist anc e equal to or less than:
R
th = (100 − 50oC)
9W = 5.5oC/W
The Thermalloy #6400 is one example of a heatsink that
meet s this r equirem en t.
The output of CVA2415 is not short circuit proof. Any
resist anc e to V+ or Gr ound should be > 600Ω.
CVA2415
CORPORATION
FALL TIME
10ns/DIV
VOLTS
10V/DIV
20V
80V
BANDWIDTH
100
MHz
110
0dB
GAIN
10dB/DIV
RISE TIME
VOLTS
10V/DIV
10ns/DIV
20V
80V
FIGURE 3.
FIGURE 2. CVA2415 DC Characte ristics
CALOGIC CORPORATION, 237 W hitney P lace, F r emont, Califo r nia 94 539, Tele ph on e: 5 10-656-2 9 0 0, FAX: 510-6 51 - 10 76
INPUT VOLTAGE
OUTPUT VOLTAGE (VOLTS)
0
60
90
35
7
POWER DISSIPATION (WATTS)
1462
50
80
40
70
30
20
10
VOLTAGE POWER
FIGURE 4. Typical Ap plicatio n CVA 1203 - CVA24 15 A p pl ic at io n
TYPIC AL APPLI CA T ION
A typical application of the CVA2415 is shown in
Figure 4.
Used in conjunction with a CVA1203, a complete video
channel from monitor input to CRT c athode is shown. In this
appl ication, feedback is local to theCVA1203. An alternati ve
scheme would be feedback from the output of the CV A 2415 t o
the positive clamp inputs of the CVA1203. This would pr ov ide
slightly bet t er bla ck level control of the syst em.
CVA2415
CORPORATION
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
0.1µF
10K
Ω
10K
Ω
10K
Ω
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
10K
Ω
0.1µF
MAX
MIN
10K
Ω
BLACK LEVEL
GATE IN
10µF+
10µF
75
Ω
30
Ω
*
VIDEO
IN
R+
10µF
75
Ω
30
Ω
*
VIDEO
IN
G+
10µF
75
Ω
30
Ω
*
VIDEO
IN
B+
CONTRAST
CONTROL
100µF
+
100
Ω
51
Ω
RED DRIVE
100
Ω
51
Ω
GREEN DRIVE
500
Ω
390
Ω
500
Ω
TO RED
CASCODE
DRIVER
TO BLUE
CASCODE
DRIVER
0.1µF
BLACK LEVEL
(BRIGHTNESS)
CONTROL
10K
Ω
10K
Ω
91
Ω
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
CVA2415
V
out
R5
C6 C2
C
L
D2
D1 L1
V
CC
V
CC
R4 OUTPUT
5
GND
3,4,10
11
1/3
CVA2415
V
out
R5
C6 C2
C
L
D2
D1 L1
V
CC
V
CC
R4 OUTPUT
5
GND
3,4,10
11
1/3
CVA2415
1B-50
CUTOFF
ADJ.
CUTOFF
ADJ.
TO GREEN
CASCODE
DRIVER
DC
RESTORE
C1
DC
RESTORE
DC
RESTORE
C1
C1
CALOGIC CORPORATION, 237 W hitney P lace, F r emont, Califo r nia 94 539, Tele ph on e: 5 10-656-2 9 0 0, FAX: 510-6 51 - 10 76
C1
µFC2
µFC3
µFC4
µFCL*
pF C6
µFR4
ΩR5
KΩR6
ΩD1 D2 L1
nH Q1
CVA2415 1.0 0.01 0.1 0.47 12 1.0 34 1.5 150 FDH400 FDH400 560 2N5770