Low Cost Triple 65MHz CRT Driver CORPORATION Discrete Solution Replacement CVA2415 FEATURES • Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65MHz • Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . <6.0ns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 VP-P • Swing • Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80V • Pin to Pin Compatible with CVA2416 and LM2416 APPLICATIONS • CRT Driver for VGA and SVGA Color Monitors DESCRIPTION The CVA2415 contains three wide bandwidth, large signal amplifiers designed specially to drive VGA and SVGA color monitors. The device is a low cost CRT driver designed especially 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 Package Temperature CVA2415T T11A -20oC to +100oC 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 CVA2415 CORPORATION ABSOLUTE MAXIMUM RATINGS Operating Temperature . . . . . . . . . . . . . . . . -20oC to +100oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85V Storage Temperature . . . . . . . . . . . . . . . . . . -25oC to +100oC DC ELECTRICAL CHARACTERISTICS VS = 80V, CL = 12pF, Vbias = 12V, Vin = 3.6V, Tcase = +25oC. See Figure 1. SYMBOL CHARACTERISTICS MIN TYP MAX UNITS 18 22 26 mA ICC Supply Current @ 1MHz ICC Supply Current @ 50MHz VoutDC Output DC Level 38 42 46 V AV Voltage Gain 11 13 15 V 40 Gain Matching mA 0.2 dB AC ELECTRICAL CHARACTERISTICS VS = 80V, CL = 12pF, Vbias = 12V, Tcase = +25oC. See Figure 1. SYMBOL CHARACTERISTICS MIN TYP MAX UNITS tr Rise Time 5.6 7.0 ns tf Fall Time 4.5 6.0 ns BW Bandwidth 65 MHz Le Linearity 8 % OS Overshoot 0 % FIGURE 1. APPLICATION AND TEST CIRCUIT 12V C4 C3 C6 R1 Q1 INPUT C1 11 VC C 1/3 CVA2415 1,6,8 Vin R2 R6 R3 2,7,9 Vbias L1 3,4,10 Vout R5 VC C OUTPUT R4 CL D2 5 GND C1 = 0.01 µF C2 = 0.01 µF C3 = 0.1 µF C4 = 0.47 µF C L = 12pF (Including Parasitics) C6 = 1.0 µF CALOGIC D1 C2 R1 = 8.2k Ω R2 = 2.7k Ω R3 = 10.0K Ω R4 = 34 Ω R5 = 1.5k Ω R6 = 150 Ω D1 = FDH400 D2 = FDH400 L1 = 560nH Q1 = 2N5770 CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076 CVA2415 CORPORATION APPLICATION INFORMATION FIGURE 2. CVA2415 DC Characteristics OUTPUT VOLTAGE (VOLTS) 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 1.8W, increasing to 3.2W at minimum output voltage. The CVA2415 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 1.8W per channel for a total dissipation of 5.4W package dissipation. Under white screen conditions, i.e.: 15V output, dissipation increases to 3W per channel or 9W total. The CVA2415 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 = 90 POWER DISSIPATION (WATTS) The CVA2415 is a high voltage triple CRT driver suitable for VGA, Super VGA, IBM 8514 1024 x 768 non-interlaced display applications. The CVA2415 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. 80 70 VOLTAGE 60 POWER 50 40 30 20 10 0 1 3 2 4 5 6 7 INPUT VOLTAGE The Thermalloy #6400 is one example of a heatsink that meets this requirement. The output of CVA2415 is not short circuit proof. resistance to V+ or Ground should be > 600Ω. Any (100 − 50oC) = 5.5oC/W 9W FIGURE 3. FALL TIME 80V RISE TIME BANDWIDTH 80V VOLTS 10V/DIV VOLTS 10V/DIV GAIN 10dB/DIV 0dB 20V 20V 10ns/DIV 10ns/DIV 1 10 100 MHz CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076 CVA2415 CORPORATION TYPICAL APPLICATION A typical application of the CVA2415 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 theCVA1203. An alternative scheme would be feedback from the output of the CVA2415 to the positive clamp inputs of the CVA1203. This would provide slightly better black level control of the system. FIGURE 4. Typical Application CVA1203 - CVA2415 Application VCC +12V 0.1µF + 1 28 100 µF RED DRIVE 0.1µF 51Ω 2 12V C4 27 100Ω C3 R VIDEO IN 26 4 25 0.1µF VIDEO IN 24 6 23 VIDEO IN 7 22 10K Ω 51Ω 21 9 20 R5 R4 CL D2 5 GND DC RESTORE 500Ω 10K Ω 19 2,7,9 Vbias 1/3 CVA2415 1,6,8 Vin TO GREEN CASCODE DRIVER R6 91Ω C2 L1 OUTPUT C1 R5 R4 CL DC RESTORE C3 12 17 13 16 Q1 0.1µF 14 15 R6 CUTOFF ADJ. MAX 10K Ω MIN TO BLUE CASCODE DRIVER 390Ω 10K Ω 10K Ω 0.1µF 10K Ω 11 VCC 2,7,9 Vbias 1/3 CVA2415 1,6,8 Vin VCC D2 12V C4 18 + D1 3,4,10 Vout 5 GND CUTOFF ADJ. 11 C6 VCC Q1 10 CONTRAST CONTROL OUTPUT C1 11 0.1µF 10 µF L1 C3 8 VCC 12V C4 100Ω 0.1µF 10 µF + 30Ω* 75Ω R6 D1 3,4,10 Vout C2 GREEN DRIVE CVA1203 B 2,7,9 Vbias 1/3 CVA2415 1,6,8 Vin CUTOFF ADJ. 10 µF + 30Ω* 75Ω TO RED CASCODE DRIVER 500Ω 5 G VCC Q1 10K Ω C6 11 0.1µF 10 µF + 30Ω* 75Ω 3 C6 D1 3,4,10 Vout C2 VCC L1 OUTPUT C1 R5 R4 CL D2 5 GND DC RESTORE BLACK LEVEL (BRIGHTNESS) CONTROL 0.1 µF 1B-50 BLACK LEVEL GATE IN CVA2415 CALOGIC C1 µF C2 µF C3 µF C4 µF CL* pF C6 µF R4 Ω R5 KΩ R6 Ω D1 D2 L1 nH Q1 1.0 0.01 0.1 0.47 12 1.0 34 1.5 150 FDH400 FDH400 560 2N5770 CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076