Improved Low Cost Triple CRT Driver CORPORATION CVA2411TX FEATURES • • • • • DESCRIPTION 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 Package Temperature CVA2411TX T11A -20oC to +100oC CONNECTION DIAGRAM AND SIMPLIFIED SCHEMATIC 11 10 9 8 7 6 5 4 3 2 1 VCC 11 VCC VOUT 3 COLLECTOR 1 COLLECTOR 3,6,9 EMITTER 3 EMITTER 2 VOUT COLLECTOR 2 2,5,10 VOUT 2 EMITTER 1 COLLECTOR 3 VBIAS Q3 1 VOUT 1 VBIAS 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 Operating Temperature . . . . . . . . . . . . . . . . . -20oC to +100oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95V Storage Temperature . . . . . . . . . . . . . . . . . . . -25oC to +125oC Maximum Current (Q3) . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA AC/DC CHARACTERISTICS TCASE = +25oC SYMBOL CHARACTERISTICS MIN TYP MAX UNITS BVCEO Collector-Emitter Breakdown Voltage (I c = 1mA) 95 V BVCBO Collector-Base Breakdown Voltage (Ic = 100µA) 100 V BVEBO Emitter-Base Breakdown Voltage (IE = 100µA) 3 HFE DC Current Gain (Ic = 50mA) 25 V VBES Base-Emitter Saturation Voltage 0.95 V VCES Collector-Emitter Saturation Voltage 0.3 V VBE(ON) Base-Emitter ON Voltage ICEO Collector Cut-Off Current 100 nA 35 — 0.6 V Cob Output Capacitance 3 pF Ccb Junction Capacitance 2 pF Cib Input Capacitance ft Current Gain Bandwidth Product (Ic = 35mA) 8 pF 150 MHz AC/DC CHARACTERISTICS of Amplifier (See test circuit) TCASE = +25oC, VCC = 80V, VIN = 3.2V, unless otherwise specified. SYMBOL CHARACTERISTCS MIN TYP MAX UNITS ICC Supply Current 30 38 mA VOUT Output Voltage, VIN = 3.6V 45 52 V AV Gain 13 15 V/V Tr Rise Time, VOUT = 45VP-P, CLOAD = 10pF 9.5 11 ns Tf Fall Time, VOUT = 45VP-P, CLOAD = 10pF 8 9 ns Overshoot 5 % FIGURE 1. TEST CIRCUIT 11 1.2K W 1 3,6,9 12V 11 CVA2411TX 33 W 2,5,10 4,7,8 10pF V IN 50 W 65 W 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 2.5 70 2.0 1.5 50 40 1.0 30 POWER (W) V OUT (V) 60 0.5 20 0 VOUT Q3 POWER Power/Output Stage VIN (VOLTS) 6.0 5.7 5.5 5.2 5.0 4.7 4.5 4.2 4.0 3.7 3.5 3.2 3.0 2.7 2.5 2.2 2.0 1.7 1.5 1.2 1.0 0.7 0.5 0 0 0.2 10 1S-15 APPLICATION INFORMATION Thermal Considerations 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 (~1.2KΩ, 3W), the CVA2411TX works well in a 69kHz (1280 x 1024 non-interlaced) monitor application. 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. 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. 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 600Ω to ground or V+. The output of CVA2411TX is not short circuit proof. resistance to V+ or Ground should be more than 600Ω. Any CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2411TX CORPORATION TYPICAL CHARACTERISTICS VOUT vs FREQUENCY 60 50 VOUT (VP-P) 40 30 20 10 0 10 20 30 50 FREQUENCY (MHz) 70 80 90 1S-16 I CC vs FREQUENCY 70 60 I CC (mA) 50 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 FALL TIME 10V/DIV 4.5V 10V/DIV 4.5V -5.5V -83.6ns 116.4ns 20ns/DIV -5.5V -45.6ns 154.4ns 20ns/DIV 1S-18 CROSS HATCH BLACK BACKGROUND 1S-19 CROSS HATCH WHITE BACKGROUND 10V/DIV 4.5V 10V/DIV 4.5V -5.5V -83.6ns 116.4ns 20ns/DIV 1S-20 -5.5V 2.4ns 202.4ns 20ns/DIV 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 N + P 2 VR101 10K CLAMP+ 2 3 L101 4U7 2 1 3 18 C105 10U 16V 2 R101 75 W R107 390 R110 18K 1 2 4 17 2 3 2 C106 0.1U V 1 1 C110 0.1U V 1 2 1 VR103 10K R-GAIN G101 C PH2369 R120 22 1 2 E C115 27P V 2 3 P101 2 GND 4 P101 1 1 5 R102 75 W 6 16 CVA1233N G C102 47u V N P + 1 N + L102 4U7 R123 33 W 2 C126 10U 16V P R111 18K 1 2 14 B C107 0.1U V C103 47u V N P + 5 P101 2 GND 6 P101 1 3 2 1 2 1 C111 0.1U V 1 8 7 P101 1 R105 15K 12 3 2 1 G103 C PH2369 C112 0.1U V 1 2 E R112 18K 1 C108 0.1U V R127 100 W 2 2 1 R109 390 2 1 1 R122 22 2 CLAMP R124 22 W VR104 10K G-GAIN C116 39P V 1 1 2 9 2 2 13 R103 75 W G102 C PH2369 E R108 390 7 2 1 2 R126 100 W 2 R121 22 15 2 1 1 CONTINUED ON NEXT PAGE GND 2 P101 19 1 C101 47u V N P + 2 2 C107 0.1U V N + P 1 P101 20 2 1 R 1 1 C113 47U V 2 1 VR105 10K B-GAIN C117 27P V 2 1 1 R125 33 W 1 1 2 R128 100 W 2 2 8 P101 GND 9 P101 VR102 10K CONTRAST 1 2 1 R106 100 2 3 2 1 10 11 1 C109 0.1U V 2 R156 100 W 1S-23A CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2411TX CORPORATION TYPICAL APPLICATION (continued) R113 100 1 2 1 2 P D101 BAV21 2 R141 22K 1 P 1 R132 10 W 1 1 R114 1M 2 N C121 10U V P D105 BAV21 N E 4 B Q104 BF423 2 3 C 2 1 R135 1.5K W 2 VR106 100K R-CUTOFF 1 C127 2 0.1U V 1 R144 15K 3 2 R133 10 W 1 R136 1.5K W 1 5 7 2 6 C124 1U 160V 1 2 CVA2411TX 1 R117 15K D106 BAV21 1 R114 1M 2 D102 BAV21 2 R142 22K 1 N P N P 1 E 2 B Q105 BF423 2 C 2 1 R134 10 W 1 1 C128 2 0.1U V 1 R118 15K 2 VR107 100K G-CUTOFF R145 15K 8 2 R137 1.5K 3W 1 9 2 C125 1U 160V 10 1 2 1 R116 1M 2 N P D107 BAV21 2 N P D103 BAV21 R143 22K W 1 2 R119 15K 1 E 11 2 L101 4U7 1 CONTINUED ON NEXT PAGE 1 R155 47 2 N + C123 1U 160V 1 2 N + P C122 10U 100V 3 B Q106 BF423 C 2 1 2 1 C129 0.1U V VR108 100K B-CUTOFF 2 R146 15K 1 1S-23B CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA2411TX CORPORATION TYPICAL APPLICATION (continued) 1 1 1 1 L104 0.33µH 2 R147 820 W 2 L105 0.56µH 1 R148 47 1/2W 2 2 R149 820 W 2 R150 47 1 1/2W 2 CRT101 CRTGND GND R G B 2 2 SP101 200V 1 SP102 200V 1 CRT 2 HEATER SP103 200V 2 1 1 C130 1N HEATING 500 G1 1 L106 0.33µH 2 2 R151 820 1 W 2 R152 47 1 1/2W 2 1 P R153 15K N 1/2W D104 2 BY336 1 C131 330P 1KV 2 H.V. 1 G2 C132 .001µF G4 R154 15K 1/2W G2 P102 3 P102 4 P102 6 2 1 JP101 N + P P102 7 C114 10U 100V G1 H+ +12V V1+ P102 2 P102 1 +80V P102 5 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