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Improved Triple 85MHz CRT Driver CORPORATION Not recommended for new design. See CVA2400A. CVA2417TX FEATURES DESCRIPTION The CVA2417TX is an improved version that features excellent gray scale linearity with no crossover distortion and less EMI. Designed especially to drive high resolution monitor for resolution up to 1280 x 1024 (non-interlaced) with pixel frequency up to 160MHz. 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 CVA2417TX Package T11A Temperature -20oC to +100oC * Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85MHz * Fall Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8ns * RiseTime.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . 504.4ns VP-P * Swing . . * Excellent Gray Scale Linearity Voltage . . . . . . . . . . . . . . . . * SupplyPin Compatible. .with .CVA2415T. . . . . . . . . . . . 80V * Pin to * CRT Driver for 1280 x 1024 and 1024 x 768 Color Monitors APPLICATIONS CONNECTION DIAGRAM AND SIMPLIFIED SCHEMATIC V+ 11 10 9 8 7 6 5 4 3 2 1 V+ VOUT 3 BIAS 3 (12V) VIN 3 BIAS 2 (12V) VIN 2 GND VOUT 2 VOUT 1 BIAS 1 (12V) VIN 1 11 VOUT 3,4,10 VBIAS 2,7,9 VIN 1,6,8 PIN 1 DESIGNATOR T11A 1H-32 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2417TX CORPORATION ABSOLUTE MAXIMUM RATINGS Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90V Storage Temperature . . . . . . . . . . . . . . . . . . -25oC to +100oC Operating Temperature . . . . . . . . . . . . . . . . -20oC to +100oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC DC ELECTRICAL CHARACTERISTICS VS = 80V, CL = 12pF, Vbias = 12V, Vin = 3.4V, Tcase = +25oC. See Figure 1. SYMBOL ICC ICC VoutDC AV CHARACTERISTICS Supply Current @ 1MHz Supply Current @ 50MHz Output DC Level Voltage Gain Gain Matching 40 11 MIN TYP 32 55 45 13 0.2 50 15 MAX 38 UNITS mA mA V V dB AC ELECTRICAL CHARACTERISTICS VS = 80V, CL = 12pF, Vbias = 12V, Tcase = +25oC. See Figure 1. SYMBOL tr tf BW Le OS CHARACTERISTICS Rise Time Fall Time Bandwidth Linearity Overshoot MIN TYP 4.4 3.8 85 8 10 MAX 6.0 5.0 UNITS ns ns MHz % % FIGURE 1. TEST CIRCUIT 12V C4 C3 C6 R1 INPUT C1 R2 Q1 11 2,7,9 VCC VBIAS 1/3 CVA2417TX 1,6,8 VIN D1 3,4,10 VOUT C2 VCC L1 OUTPUT R5 D2 R4 CL R6 R3 5 GND R1 = 8.2kW R2 = 2.7kW R3 = 10.0KW R4 = 34W R5 = 1.5kW R6 = 150W D1 = FDH400 D2 = FDH400 L1 = 560nH Q1 = 2N5770 1H-33 C1 = 0.01mF C2 = 0.01mF C3 = 0.1mF C4 = 0.47mF CL = 12pF (Including Parasitics) C6 = 1.0mF CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2417TX CORPORATION APPLICATION INFORMATION The CVA2417TX 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 CVA2417TX 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 2.8W, increasing to 4.8W at minimum output voltage. The CVA2417TX 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 2.8W per channel for a total dissipation of 8.4W package dissipation. Under white screen conditions, i.e.: 15V output, dissipation increases to 4.8W per channel or 14.4W total. The CVA2417TX case temperature must be maintained below +100oC. If the maximum expected ambient temperature is +50oC, then a heat sink is needed with thermal resistance equal to or less than: Rth = FIGURE 2. CVA2417TX DC Characteristics 5 OUTPUT VOLTAGE (VOLTS) 90 80 70 60 50 40 30 20 10 1 VOLTAGE POWER 3 4 POWER DISSIPATION (WATTS) 2 0 1 2 3 4 5 6 7 1H-43 INPUT VOLTAGE The Thermalloy #14754 is one example of a heatsink that meets this requirement. The CVA2417TX maximum load is 600 to ground or V+. The output of CVA2417TX is not short circuit proof. resistance to V+ or Ground should be > 600. Any (100 - 50oC) 14.4W = 3.5 C/W o FIGURE 3. FALL TIME 80V 80V RISE TIME 0dB BANDWIDTH 10V 5ns/DIV 10V 5ns/DIV GAIN 10dB/DIV VOLTS 10V/DIV VOLTS 10V/DIV 1 10 MHz 100 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2417TX CORPORATION TYPICAL APPLICATION A typical application of the CVA2417TX is shown in Figure 4. FIGURE 4. TYPICAL APPLICATION 12V C3 C4 C6 R2 C2 11 VCC VBIAS 2,7,9 1/3 CVA2417TX VIN D1 L1 R4 OUTPUT C1 R5 VOUT 3,4,10 D2 FROM PREAMP R1 1,6,8 CL 5 GND DC RESTORE 1H-34 C1 F CVA2417 1.0 C2 F 0.01 C3 F 0.1 C4 F 0.43 CL* pF 12 C6 F 1.0 R1 22 R2 47 R4 34 R5 K 1.5 D1 FDH400 D2 FDH400 L1 nH 560 Q1 2N5770 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 |
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