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Low Cost Triple CRT Driver
CORPORATION
CVA2422TL
FEATURES DESCRIPTION The CVA2422TL contains three cascode video driver amplifiers without a common emitter. This device is designed for ease of use, adjustable gain, controlled EMI, OSD, and external peaking. 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 CVA2422TL Package T11A Temperature -20oC to +90oC
* * * * *
Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90MHz Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0ns Swing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70VP-P Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90V
APPLICATIONS CRT driver for up to 82kHz monitors with resolution up to 1280 x 1024.
CONNECTION DIAGRAM
11 V+ 10 9 8 7 6 5 4 3 2 1
VOUT 2
VCC 11
VOUT 3 VBIAS 3 VIN 3 VBIAS 2 VIN 2 GND
R1 = 1000
12 VO 3,4,10 12
VOUT 1 VBIAS 1 VIN 1
VB 2,7,9 Vin
TOP VIEW T11A PACKAGE
1C-46
1,6,8
GND 5
1D-18
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CVA2422TL
CORPORATION
ABSOLUTE MAXIMUM RATINGS Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95V Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16W Storage Temperature . . . . . . . . . . . . . . . . . . . -25oC to +100oC Operating Temperature . . . . . . . . . . . . . . . . . . -20oC to +90oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC
DC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 8pF, DCINPUT BIAS = 12V, VIN = 3.4V, VOUT = 50Vp-p. TCASE = +25oC. See Figure 1.
SYMBOL Icc Icc VOUT DC Av CHARACTERISTICS Supply Current @ 1MHz Supply Current @ 50MHz Output DC Level Voltage Gain Gain Matching 40 12 MIN TYP 34 58 45 15 0.2 50 17 MAX 40 UNITS mA mA V V dB
AC ELECTRICAL CHARACTERISTICS Vs = 80V, CL = 8pF, DCINPUT BIAS = 12V, VIN = 3.4V, VOUT = 50Vp-p. TCASE = +25oC. See Figure 1.
SYMBOL Tr Tf BW Le OS Rise Time Fall Time Bandwidth Linearity Overshoot CHARACTERISTICS MIN TYP 5 5 90 6 6 MAX 6 6 UNITS ns ns MHz % %
FIGURE 1. TEST CIRCUIT
VCC 11 C3 R3 VBIAS 2,7,9 C1 C2 CVA2422TL VIN 1,6,8 Q1 R2 R1 VIDEO INPUT C1 = 0.01 F C2 = 100 F C3 = 0.1 F C4 = 100 F C5 = 2.2 F C6 = 8pF (INCLUDING PARASITIC) R1 = 62 R2 = 120 R3 = 180 R4 = 47 Q1 = 2N3904 D1, D2 = FHD400
1G-30
C4
D1 VOUT 3,4,10 C5 D2 R4 C6
GND 5
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CVA2422TL
CORPORATION
FIGURE 2. APPLICATION CIRCUIT
VCC 11 C3 R3 C1 C2 CVA2422TL R6 VIN 1,6,8 R7 R9 Q2 C6 R5 R1 R2 R1 = 62 R2 = 62 R3 = 180 R4 = 47(1/2W) R5 = 120 R6 = 7.5K R7 = 33 R8 = 39 R9 = 56 C1 = 0.01 F C2 = 100 F C3 = 0.1 F C4 = 100 F C5 = 2.2 F C6 = 40 - 120pf C7 = 40 - 120pf Q1 = 2N3904 Q2 = 2N3904 D1, D2 = FHD400 Q1 GND 5 D2 VBIAS 2,7,9 D1 VOUT 3,4,10 C5 R4 SPARK GAP C4
C7 VIDEO INPUT Tr,Tf = <4ns R8
OSD
1G-31
FIGURE 3. APPLICATION CIRCUIT
VCC 11 C3 R3 C1 C2 CVA2422TL R6 VIN 1,6,8 R7 R9 Q2 C6 R5 R1 R2 R1 = 62 R2 = 62 R3 = 180 R4 = 47(1/2W) R5 = 120 R6 = 7.5K R7 = 33 R8 = 39 R9 = 56 R10 = 680 C1 = 0.01 F C2 = 100 F C3 = 0.1 F C4 = 100 F C5 = 2.2 F C6 = 40 - 120pf C7 = 40 - 120pf Q1 = 2N3904 Q2 = 2N3904 D1, D2 = FHD400 L = 330 - 390nH Q1 GND 5 D2 VBIAS 2,7,9 D1 VOUT 3,4,10 C5 R10 SPARK GAP R4 C4 L
C7 VIDEO INPUT Tr,Tf = <4ns R8
OSD
1G-32
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CVA2422TL
CORPORATION
APPLICATION INFORMATION The CVA2422TL is a high voltage triple CRT driver suitable for VGA, Super VGA, IBM(R) 8514, 1280 x 1024 and 1024 x 768 non-interlaced display applications. The CVA2422TL features 80V operation. 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 4. Since this is a class A input stage, power supply current increases as the input signal increases and consequently power dissipation also increases. The CVA2422TL cannot be used without heat sinking. Figure 2 shows the power dissipated in each channel over the operating voltage range of the device. Under white screen conditions, i.e.: 20V output, dissipation increases to 16W total. The CVA2422TL 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 =
FIGURE 4. CVA2422TL DC Characteristics
6 110 100 90 80 70 60 50 40 30 20 10 0 1
POWER DISSIPATION (WATTS) OUTPUT VOLTAGE (VOLTS)
5 4
VOLTAGE POWER
3 2 1
2
3
4
5
6
7
1G-26
INPUT VOLTAGE
(90 - 50oC)
16W
= 2.5oC/W
The CVA2422TL maximum load is 600 to ground or V+. The output of CVA2422TL is not short circuit proof. resistance to V+ or Ground should be > 600. Any
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CVA2422TL
CORPORATION
TYPICAL CHARACTERISTICS
RISE TIME
WITH PEAKING INDUCTOR & CAPACITOR
FALL TIME
WITH PEAKING INDUCTOR & CAPACITOR
30V
30V
8V/DIV
10V 10ns/DIV
1D-02
8V/DIV
10V 10ns/DIV
1D-03
RISE TIME
WITH PEAKING CAPACITOR (NO INDUCTOR)
FALL TIME
WITH PEAKING CAPACITOR (NO INDUCTOR)
90V
90V
8V/DIV
10V 10ns/DIV
1D-04
8V/DIV
10V 10ns/DIV
1D-05
RISE TIME
NO PEAKING INDUCTOR OR CAPACITOR
FALL TIME
NO PEAKING INDUCTOR OR CAPACITOR
120.5V
120.5V
10V/DIV
2.5V 10ns/DIV
1D-06
10V/DIV
2.5V 10ns/DIV
1D-07
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025

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