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| Triple 85MHz CRT Driver CORPORATION CVA2419TX FEATURES 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. ORDERING INFORMATION Part CVA2419TX Package T11A Temperature -20oC to +90oC * Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85MHz * Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . <5.0ns ...... * Swing .Voltage .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . 50 VP-P . . 80V * Supply * Pin to Pin Compatible with CVA2415, CVA2416, CVA2417, LM2416 and LM2419 APPLICATIONS * CRT Driver for 1280 x 1024 and 1024 x 768 Color Monitors CONNECTION DIAGRAM 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 PIN 1 DESIGNATOR T11A CVA2419TX CORPORATION ABSOLUTE MAXIMUM RATINGS Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85V Storage Temperature . . . . . . . . . . . . . . . . . . -25oC to +100oC Operating Temperature . . . . . . . . . . . . . . . . . -20oC to +90oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC DC ELECTRICAL CHARACTERISTICS VS = 80V, CL = 12pF, DCinput bias = 12V, Vin = 3.9V, Vout = 50Vp-p, Tcase = +25oC. See Figure 1. SYMBOL ICC ICC VoutDC AV CHARACTERISTICS Supply Current @ 1MHz Supply Current @ 50MHz Output DC Level Voltage Gain Gain Matching 45 12 MIN TYP 28 50 50 15 0.2 55 17 MAX 36 UNITS mA mA V V dB AC ELECTRICAL CHARACTERISTICS VS = 80V, CL = 12pF, DCinput bias = 12V, Vin = 3.9V, Vout = 50Vp-p, Tcase = +25oC. See Figure 1. SYMBOL tr tf BW Le OS CHARACTERISTICS Rise Time Fall Time Bandwidth Linearity Overshoot MIN TYP 4.5 4.9 85 6 6 MAX 6.0 6.0 UNITS ns ns MHz % % FIGURE 1. TEST CIRCUIT 12V C4 C3 C6 R1 INPUT C1 R2 Q1 C2 VCC 11 2,7,9 VCC Vbias 1/3 CVA2419TX 1,6,8 Vin 5 GND D1 3,4,10 L1 OUTPUT Vout D2 R5 R4 CL R6 R3 C1 = 0.01mF C2 = 1.0mF C3 = 0.1mF C4 = 0.47mF CL = 12pF (Including Parasitics) C6 = 1.0mF 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 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 = FIGURE 2. CVA2419TX DC Characteristics 5 OUTPUT VOLTAGE (VOLTS) 90 80 70 60 50 40 30 20 10 1 2 VOLTAGE POWER 4 POWER DISSIPATION (WATTS) 3 0 1 2 3 4 5 6 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 > 600. Any (90 - 50oC) 16W = 2.5oC/W FIGURE 3. FALL TIME 80V 80V RISE TIME 0dB BANDWIDTH VOLTS 10V/DIV VOLTS 10V/DIV 20V 5ns/DIV 20V 5ns/DIV 1 10 MHz 100 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076 GAIN 5dB/DIV 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 0.1mF VCC +12V + 100mF 1 0.1mF 28 RED DRIVE 519 2 27 1009 C3 12V C4 11 3 R VIDEO IN 10mF + 30W * 759 0.1mF 26 Q1 C6 D1 3,4,10 L1 C2 VCC 4 10K9 0.1mF 25 500W TO RED CASCODE DRIVER CUTOFF ADJ. VCC 2,7,9 Vbias 1/3 CVA2419TX 1,6,8 Vin 5 GND Vout D2 OUTPUT C1 R5 R4 CL 5 G VIDEO IN 10mF + 30W * 759 10K9 24 R6 6 23 DC RESTORE GREEN DRIVE 519 7 CVA1203 8 B VIDEO IN 10mF + 30W * 759 0.1mF 22 1009 C3 12V C4 11 VCC 2,7,9 Vbias 1/3 CVA2419TX 1,6,8 Vin 5 GND 21 Q1 C6 D1 3,4,10 L1 C2 VCC 9 10K9 20 500W TO GREEN CASCODE DRIVER Vout D2 OUTPUT C1 R5 R4 CL 10 0.1mF 19 CUTOFF ADJ. R6 11 + 10mF 18 919 C3 12V C4 11 VCC 2,7,9 Vbias 1/3 CVA2419TX 1,6,8 Vin 5 GND DC RESTORE VCC 12 17 Q1 C6 D1 3,4,10 L1 C2 13 0.1mF 14 16 3909 15 TO BLUE CASCODE DRIVER Vout D2 OUTPUT C1 R5 R4 CL R6 CONTRAST CONTROL MAX 10K9 MIN 10K9 0.1mF 10K9 10K9 CUTOFF ADJ. BLACK LEVEL (BRIGHTNESS) CONTROL 0.1mF BLACK LEVEL GATE IN DC RESTORE 1C-02 C1 F CVA2419TX 1.0 C2 F 1.0 C3 F 0.1 C4 F 0.47 CL* pF 12 C6 F 1.0 R1 K 7.5 R2 K 7.5 R3 K 10.0 R4 34 R5 K 5.1 R6 180 D1 FDH400 D2 L1 nH Q1 FDH400 500 2N5770 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076 |
Price & Availability of CVA2419
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