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| Low Cost Triple 65MHz CRT Driver CORPORATION Discrete Solution Replacement CVA2415 FEATURES 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 CVA2415T Package T11A Temperature -20oC to +100oC * Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65MHz * Rise/Fall Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . <6.0ns ...... * Swing .Voltage .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . 50 VP-P . . 80V * Supply * Pin to Pin Compatible with CVA2416 and LM2416 * CRT Driver for VGA and SVGA Color Monitors APPLICATIONS 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 CVA2415 CORPORATION ABSOLUTE MAXIMUM RATINGS Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85V Storage Temperature . . . . . . . . . . . . . . . . . . -25oC to +100oC Operating Temperature . . . . . . . . . . . . . . . . -20oC to +100oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC DC ELECTRICAL CHARACTERISTICS VS = 80V, CL = 12pF, Vbias = 12V, Vin = 3.6V, Tcase = +25oC. See Figure 1. SYMBOL ICC ICC VoutDC AV CHARACTERISTICS Supply Current @ 1MHz Supply Current @ 50MHz Output DC Level Voltage Gain Gain Matching 38 11 MIN 18 TYP 22 40 42 13 0.2 46 15 MAX 26 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 5.6 4.5 65 8 0 MAX 7.0 6.0 UNITS ns ns MHz % % FIGURE 1. APPLICATION AND TEST CIRCUIT 12V C4 C3 C6 R1 INPUT C1 R3 R2 R6 Q1 2,7,9 Vbias 1,6,8 Vin 5 GND R1 = 8.2k R2 = 2.7k R3 = 10.0K R4 = 34 R5 = 1.5k R6 = 150 VC C 1/3 CVA2415 11 D1 3,4,10 Vout D2 L1 OUTPUT R5 R4 CL C2 VC C C1 = 0.01 F C2 = 0.01 F C3 = 0.1 F C4 = 0.47 F C L = 12pF (Including Parasitics) C6 = 1.0 F D1 = FDH400 D2 = FDH400 L1 = 560nH Q1 = 2N5770 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076 CVA2415 CORPORATION APPLICATION INFORMATION The CVA2415 is a high voltage triple CRT driver suitable for VGA, Super VGA, IBM(R) 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. 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 = (100 - 50oC) = 5.5oC/W 9W FIGURE 2. CVA2415 DC Characteristics OUTPUT VOLTAGE (VOLTS) 90 80 70 60 50 40 30 20 10 0 1 2 3 4 5 6 7 VOLTAGE POWER POWER DISSIPATION (WATTS) 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 > 600. Any FIGURE 3. FALL TIME 80V 80V RISE TIME BANDWIDTH 0dB 20V 10ns/DIV 20V 10ns/DIV 1 10 MHz 100 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076 GAIN 10dB/DIV VOLTS 10V/DIV VOLTS 10V/DIV 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 0.1F VCC +12V + 1 28 100 F RED DRIVE 51 2 27 100 C3 3 26 Q1 4 25 500 5 24 TO RED CASCODE DRIVER CUTOFF ADJ. 6 23 GREEN DRIVE 51 7 CVA1203 8 21 Q1 9 20 500 10 19 CUTOFF ADJ. 11 18 91 C3 12 17 Q1 13 16 390 14 15 TO BLUE CASCODE DRIVER CUTOFF ADJ. 10K 10K 10K BLACK LEVEL (BRIGHTNESS) CONTROL 0.1 F 1B-50 0.1F 12V C4 11 2,7,9 Vbias 1/3 CVA2415 1,6,8 Vin 5 GND VCC D1 3,4,10 Vout D2 DC RESTORE C6 L1 OUTPUT C1 R5 R4 CL C2 VCC R VIDEO IN 10 F + 30* 75 10K 0.1F 0.1F R6 G VIDEO IN 10 F + 30* 75 10K 22 100 C3 12V C4 11 2,7,9 Vbias 1/3 CVA2415 1,6,8 Vin 5 GND VCC D1 3,4,10 Vout D2 DC RESTORE VCC C6 L1 OUTPUT C1 R5 R4 CL C2 VCC B VIDEO IN 10 F + 30* 75 0.1F 10K 0.1F TO GREEN CASCODE DRIVER R6 10 F + 12V C4 11 VCC 2,7,9 Vbias 1/3 CVA2415 1,6,8 Vin 5 GND C6 D1 3,4,10 Vout D2 DC RESTORE L1 C2 OUTPUT C1 R5 R4 CL 0.1F R6 CONTRAST CONTROL MAX 10K MIN 0.1F BLACK LEVEL GATE IN C1 F CVA2415 1.0 C2 F 0.01 C3 F 0.1 C4 F 0.47 CL* pF 12 C6 F 1.0 R4 34 R5 K 1.5 R6 150 D1 FDH400 D2 FDH400 L1 nH 560 Q1 2N5770 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076 |
Price & Availability of CVA2415
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