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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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