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| Improved Low Cost Triple CRT Driver CVA2411TX FEATURES DESCRIPTION CORPORATION * * * * * * Ease of Use Small Heat Sink OSD Option EMI Control Option Excellent Gray Scale Linearity APPLICATIONS CRT Displays for 1280 x 1024 Resolution with Pixel Clock Frequency up to 160MHz The CVA2411TX is an improved low cost version that features excellent gray scale linearity with no crossover distortion and less EMI for 69kHz (horizontal scanning frequency) monitors. The CVA2411TX can be used with pre-amplifiers where the common emitter transistor is part of the pre-amp. With this device, OSD, peaking coil, and peaking capacitor can be available. A very small heat sink is required to pick-up ground from the standard TO220 package Tab. With 65MHz bandwidth, the device is an ideal low cost solution for 14", 15" and 17" monitors. ORDERING INFORMATION Part CVA2411TX Package T11A Temperature -20oC to +100oC CONNECTION DIAGRAM AND SIMPLIFIED SCHEMATIC 11 10 9 8 7 6 5 4 3 2 1 VCC VOUT 3 VCC 11 COLLECTOR 1 EMITTER 3 EMITTER 2 COLLECTOR 2 VOUT 2 COLLECTOR 3,6,9 VOUT 2,5,10 EMITTER 1 COLLECTOR 3 VOUT 1 VBIAS VBIAS 1 Q3 EMITTER 4,7,8 TAB 1H-39 TAB = GND TOP VIEW T11A PACKAGE 1B-17 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2411TX CORPORATION ABSOLUTE MAXIMUM RATINGS Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95V Storage Temperature . . . . . . . . . . . . . . . . . . . -25oC to +125oC Maximum Current (Q3) . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA AC/DC CHARACTERISTICS TCASE = +25oC SYMBOL BVCEO BVCBO BVEBO HFE VBES VCES VBE(ON) ICEO Cob Ccb Cib ft CHARACTERISTICS Collector-Emitter Breakdown Voltage (I c = 1mA) Collector-Base Breakdown Voltage (Ic = 100A) Emitter-Base Breakdown Voltage (IE = 100A) DC Current Gain (Ic = 50mA) Base-Emitter Saturation Voltage Collector-Emitter Saturation Voltage Base-Emitter ON Voltage Collector Cut-Off Current Output Capacitance Junction Capacitance Input Capacitance Current Gain Bandwidth Product (Ic = 35mA) 3 2 8 150 0.6 100 MIN 95 100 3 25 35 0.95 0.3 TYP MAX UNITS V V V -- V V V nA pF pF pF MHz Operating Temperature . . . . . . . . . . . . . . . . . -20oC to +100oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC AC/DC CHARACTERISTICS of Amplifier (See test circuit) TCASE = +25oC, VCC = 80V, VIN = 3.2V, unless otherwise specified. SYMBOL ICC VOUT AV Tr Tf Overshoot Supply Current Output Voltage, VIN = 3.6V Gain Rise Time, VOUT = 45VP-P, CLOAD = 10pF Fall Time, VOUT = 45VP-P, CLOAD = 10pF CHARACTERISTCS MIN TYP 30 45 13 9.5 8 5 MAX 38 52 15 11 9 UNITS mA V V/V ns ns % FIGURE 1. TEST CIRCUIT 11 1.2K 9 1 12V 3,6,9 11 CVA2411TX 4,7,8 339 V IN 10pF 2,5,10 509 659 120pF 1S-22 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2411TX CORPORATION FIGURE 3. CVA2411TX TRANSFER CHARACTERISTICS 80 70 2.0 60 V OUT (V) 2.5 50 40 30 1.5 POWER (W) 1.0 0.5 20 10 0 0 0.2 0.5 0.7 1.0 1.2 1.5 1.7 2.0 2.2 2.5 2.7 3.0 3.2 3.5 3.7 4.0 4.2 4.5 4.7 5.0 5.2 5.5 5.7 VOUT Q3 POWER Power/Output Stage VIN (VOLTS) 1S-15 APPLICATION INFORMATION The CVA2411TX consists of three identical transistor arrays that includes cascode transistor, push pull output stage and biased diodes for no cross-over distortion. This design technique makes the CVA2411TX an ideal candidate for a CRT driver application. Used with an external emitter follower, such as the 2N2369, and a load resistor (~1.2K, 3W), the CVA2411TX works well in a 69kHz (1280 x 1024 non-interlaced) monitor application. For power and cost effective applications, CVA2411TX is the ideal solution. The CVA2411TX requires a very small heat sink as the majority of the power is dissipated in load resistors. The emiitter peaking option maximizes the high frequency gain. In the following pages a full schematic and the picture of a demo board are provided, demonstrating that the CVA2411TX works well for 69kHz monitors. See characteristics taken at the cathode of the monitor. Thermal Considerations The transfer characteristics of the CVA2411TX application (Figure 2.) are shown in Figure 3. Since this is a class A input stage, power supply current increases as the input signal increases and consequently power dissipation also increases. The CVA2411TX cannot be used without a heat sink as the tab is grounded and also the case temperature should be maintained at less than 100oC. Under white screen condition, i.e. 25V output, dissipation is 0.6W/channel. Under gray level conditions CL = 8pf, VOUT = 45P-P, the dissipation is 1.6W/channel. 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) 4.8W = 10.4oC/W The CVA2411TX maximum load is 600 to ground or V+. The output of CVA2411TX is not short circuit proof. resistance to V+ or Ground should be more than 600. Any CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 6.0 0 CVA2411TX CORPORATION TYPICAL CHARACTERISTICS VOUT vs FREQUENCY 60 50 40 VOUT (VP-P) 30 20 10 0 10 20 30 50 FREQUENCY (MHz) 70 80 90 1S-16 I CC vs FREQUENCY 70 60 50 I CC (mA) 40 30 20 10 0 1.0 1.11 1.25 1.42 1.66 2.0 2.5 3.33 5.0 10.0 11.11 12.5 14.2 16.6 20.0 25.0 33.3 50.0 80.0 FREQUENCY (MHz) 1S-17 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2411TX CORPORATION TYPICAL CHARACTERISTICS (continued) RISE TIME 4.5V 4.5V FALL TIME 10V/DIV -5.5V -83.6ns 20ns/DIV 116.4ns 1S-18 -5.5V -45.6ns 20ns/DIV 10V/DIV 154.4ns 1S-19 CROSS HATCH BLACK BACKGROUND 4.5V 4.5V CROSS HATCH WHITE BACKGROUND 10V/DIV -5.5V -83.6ns 20ns/DIV 116.4ns 1S-20 -5.5V 2.4ns 20ns/DIV 10V/DIV 202.4ns 1S-21 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2411TX CORPORATION TYPICAL APPLICATION 1 R104 15K 2 1 2 3 2 1 C107 0.1U V 1 20 N + P C113 47U V VR101 10K CLAMP+ 2 L101 4U7 1 N + P C105 10U 16V 2 19 R 1 P101 2 R101 75 W C101 47u V N P + 3 18 2 R107 390 1 2 R110 18K 1 R120 22 1 2 E 2 C115 27P V 1 1 R126 100 W G101 C PH2369 GND 2 P101 1 4 2 1 C102 47u V N P + R102 75 W C106 0.1U V 17 2 1 3 C110 0.1U V 2 1 VR103 10K R-GAIN 1 5 16 1 N + P C126 10U 16V L102 4U7 2 R123 33 W G 3 P101 2 GND 4 P101 1 CVA1233N 2 6 15 2 R108 390 1 2 R111 18K 1 1 R121 22 2 G102 C PH2369 E 2 1 R124 22 W 1 C116 39P V 1 R127 100 W 7 2 1 C103 47u V N P + R103 75 W C107 0.1U V 14 2 1 3 C111 0.1U V 2 1 VR104 10K G-GAIN 2 2 B 5 P101 2 8 13 2 R109 390 1 2 R112 18K 1 1 R122 22 2 G103 C PH2369 E 2 1 R125 33 W 1 C117 27P V 1 R128 100 W GND 6 P101 1 9 2 7 P101 1 8 P101 9 P101 VR102 10K CONTRAST 1 2 32 1 C109 0.1U V 1 R106 100 2 10 1 2 C108 0.1U V 12 2 1 3 C112 0.1U V 2 1 VR105 10K B-GAIN 2 2 CLAMP R105 15K 11 1 R156 100 W GND 2 1S-23A CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CONTINUED ON NEXT PAGE 2 CVA2411TX CORPORATION TYPICAL APPLICATION (continued) R113 100 1 2N + P 1 R155 47 2 C121 10U V R132 10 W 1 2 1 2 C123 1U 160V 1 2 N P N P D101 BAV21 D105 BAV21 1 R114 1M 2 2 R141 22K 1 1 E R117 15K 2 4 Q104 BF423 C B 2 1 3 1 C127 2 0.1U V 1 VR106 100K R-CUTOFF R144 15K R135 1.5K W 1 2 3 R133 10 W 1 2 7 5 C124 1U 160V 1 2 N P N P D102 BAV21 D106 BAV21 1 R114 1M 2 2 R142 22K 1 1 E CVA2411TX R118 15K R136 1.5K W 1 2 2 6 Q105 BF423 C B 2 1 2 1 C128 2 0.1U V 1 VR107 100K G-CUTOFF R145 15K R134 10 W 1 2 8 R137 1.5K 3W 1 2 9 C125 1U 160V 10 1 2 N P N P D103 BAV21 D107 BAV21 1 R116 1M 2 2 R143 22K W 1 E 2 R119 15K 1 B C 2 1 C129 0.1U V 3 2 1 2 R146 15K 1 VR108 100K B-CUTOFF 11 2 L101 4U7 1 N + P C122 10U 100V Q106 BF423 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CONTINUED ON NEXT PAGE 1S-23B CVA2411TX CORPORATION TYPICAL APPLICATION (continued) 1 L104 0.33H 2 R148 47 1/2W 1 R147 820 W2 1 2 1 L105 0.56H 2 R150 47 1 1/2W 2 1 R149 820 W2 GND CRT101 CRTGND R G B 2 SP101 200V 1 1 2 SP102 200V 1 2 SP103 200V 2 1 C130 1N HEATING 500 G1 G2 G4 CRT HEATER 1 L106 0.33H 2 R152 47 1 1/2W 2 2 1 R151 820 1W2 P R153 15K N 1/2W D104 2 BY336 1 C131 330P 1KV 2 H.V. 1 C132 .001F R154 15K 1/2W G2 G1 H+ +12V V1+ P102 3 P102 4 P102 6 N + P P102 7 C114 10U 100V P102 2 P102 1 P102 5 2 1 JP101 +80V 1S-23C CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2411TX CORPORATION CIRCUIT BOARD CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2411TX CORPORATION CIRCUIT BOARD CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 |
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