Triple 85MHz CRT Driver CORPORATION CVA2419TX FEATURES • Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85MHz • Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . <5.0ns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 VP-P • Swing • Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80V • Pin to Pin Compatible with CVA2415, CVA2416, CVA2417, LM2416 and LM2419 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. APPLICATIONS Driver for 1280 x 1024 and 1024 x 768 Color • CRT Monitors ORDERING INFORMATION Part Package Temperature CVA2419TX T11A -20oC to +90oC CONNECTION DIAGRAM 11 10 9 8 7 6 5 4 3 2 1 PIN 1 DESIGNATOR T11A V+ VOUT 3 BIAS 3 (12V) VIN 3 BIAS 2 (12V) VIN 2 GND VOUT 2 VOUT 1 BIAS 1 (12V) VIN 1 CVA2419TX CORPORATION ABSOLUTE MAXIMUM RATINGS Operating Temperature . . . . . . . . . . . . . . . . . -20oC to +90oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85V Storage Temperature . . . . . . . . . . . . . . . . . . -25oC to +100oC DC ELECTRICAL CHARACTERISTICS VS = 80V, CL = 12pF, DCinput bias = 12V, Vin = 3.9V, Vout = 50Vp-p, Tcase = +25oC. See Figure 1. SYMBOL CHARACTERISTICS MIN TYP MAX UNITS 36 mA ICC Supply Current @ 1MHz 28 ICC Supply Current @ 50MHz 50 VoutDC Output DC Level 45 50 55 V AV Voltage Gain 12 15 17 V Gain Matching mA 0.2 dB AC ELECTRICAL CHARACTERISTICS VS = 80V, CL = 12pF, DCinput bias = 12V, Vin = 3.9V, Vout = 50Vp-p, Tcase = +25oC. See Figure 1. SYMBOL CHARACTERISTICS MIN TYP MAX UNITS tr Rise Time 4.5 6.0 ns tf Fall Time 4.9 6.0 ns BW Bandwidth 85 MHz Le Linearity 6 % OS Overshoot 6 % FIGURE 1. TEST CIRCUIT 12V C4 C3 C6 R1 Q1 INPUT C1 R2 R6 R3 11 2,7,9 VCC Vbias 1/3 CVA2419TX 1,6,8 Vin D1 C2 VCC L1 3,4,10 OUTPUT Vout R5 R4 CL D2 5 GND C1 = 0.01m F C2 = 1.0m F C3 = 0.1m F C4 = 0.47m F CL = 12pF (Including Parasitics) C6 = 1.0m F 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 FIGURE 2. CVA2419TX DC Characteristics 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 = (90 − 50oC) 16W 4 80 70 VOLTAGE 60 POWER 3 50 2 40 30 1 20 10 0 1 2 3 4 5 6 POWER DISSIPATION (WATTS) OUTPUT VOLTAGE (VOLTS) 5 90 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 > 600Ω. Any = 2.5oC/W FIGURE 3. FALL TIME 80V RISE TIME BANDWIDTH 80V 20V GAIN 5dB/DIV VOLTS 10V/DIV VOLTS 10V/DIV 0dB 20V 5ns/DIV 5ns/DIV 1 10 100 MHz CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076 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 VCC +12V 0.1m F + 1 28 RED DRIVE 0.1m F 2 27 3 26 100m F 51W 12V C4 100W C3 VIDEO IN Q1 4 25 0.1m F 10KW 75W 10m F + 30W * VIDEO IN 24 6 23 7 22 51W VIDEO IN 21 9 20 500W 10KW 0.1m F 10m F TO GREEN CASCODE DRIVER 19 10 R6 OUTPUT C1 R5 R4 CL D2 DC RESTORE 11 18 12 17 13 16 D1 C2 Vout OUTPUT C1 R5 R4 CL D2 DC RESTORE C3 0.1m F TO BLUE CASCODE DRIVER 390W 14 15 MAX 10KW MIN 10KW 0.1m F 10KW 10KW 11 VCC 2,7,9 Vbias 1/3 CVA2419TX 1,6,8 Vin C6 D1 C2 Vout VCC L1 3,4,10 OUTPUT C1 R5 R4 CL D2 5 GND DC RESTORE BLACK LEVEL (BRIGHTNESS) CONTROL 0.1m F BLACK LEVEL GATE IN CVA2419TX R6 CUTOFF ADJ. VCC L1 3,4,10 12V C4 91W + C6 5 GND CUTOFF ADJ. Q1 CONTRAST CONTROL Vout 5 GND 11 VCC 2,7,9 Vbias 1/3 CVA2419TX 1,6,8 Vin Q1 75W L1 3,4,10 C3 8 VCC 12V C4 100W 0.1m F 10m F + 30W * D1 C2 GREEN DRIVE CVA1203 B R6 CUTOFF ADJ. 10KW 75W TO RED CASCODE DRIVER 500W 5 G VCC 2,7,9 Vbias 1/3 CVA2419TX 1,6,8 Vin 0.1m F 10m F + 30W * R C6 11 1C-02 C1 µF C2 µF C3 µF C4 µF CL* pF C6 µF R1 KΩ R2 KΩ R3 KΩ R4 Ω R5 KΩ R6 Ω D1 1.0 1.0 0.1 0.47 12 1.0 7.5 7.5 10.0 34 5.1 180 FDH400 D2 L1 nH Q1 FDH400 500 2N5770 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076