improved low cost triple crt driver cva2411tx features 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 description the cva2411tx is an improved low cost version that features excellent gray scale linearity with no crossover distortion and less emi for 64khz (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 -20 o c to +100 o c corporation connection diagram and simplified schematic 1h-39 3,6,9 2,5,10 collector 1 v bias v out 11 v cc tab q3 emitter 4,7,8 v out 11 10 9 8 7 6 5 4 3 2 1 bias tab = gnd v collector emitter emitter collector emitter collector v 1b-17 cc out v out v top view t11a package calogic corporation, 237 whitney place, fremont, california 94539, telephone: 510-656-2900, fax: 510-651-3025
absolute maximum ratings supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95v storage temperature . . . . . . . . . . . . . . . . . . . -25 o c to +100 o c operating temperature . . . . . . . . . . . . . . . . . -20 o c to +100 o c lead temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300 o c cva2411tx corporation dc electrical characteristics t case = +25 o c symbol characteristics min typ max units bv ceo collector-emitter breakdown voltage (i c = 1ma) 95 v bv cbo collector-base breakdown voltage (i c = 100 m a) 100 v bv ebo emitter-base breakdown voltage (i e = 100 m a) 3 v h fe dc current gain (i c = 35ma) 30 50 v v bes 0.95 v ces 0.3 v be(on) 0.6 i ceo 100 na ac electrical characteristics t case = +25 o c symbol characteristcs min typ max units c ob output capacitance 3 pf c cb junction capacitance 2 pf c ib input capacitance 8 pf f t current gain bandwidth product (i c = 35ma) 150 mhz figure 1. typical characteristics 10ns/div 10v/div 102.5v 2.5v 1j-8 rise time 10ns/div 10v/div 102.5v 2.5v 1j-9 fall time calogic corporation, 237 whitney place, fremont, california 94539, telephone: 510-656-2900, fax: 510-651-3025
cva2411tx corporation figure 2. application circuit 5.6k w c4 2.2 m f d1 fdh400 d2 fdh400 r7 r11 l1 r12 r8 10k w r9 1.5k w q2 2n3904 r10 1.5k w 47 w 330nh 820 w c5 .1 m f r-output 5.6k w c4 2.2 m f d1 fdh400 d2 fdh400 r7 r11 l1 r12 r8 10k w r9 1.5k w q2 2n3904 r10 1.5k w 47 w 330nh 820 w c5 .1 m f g-output 5.6k w c4 2.2 m f d1 fdh400 d2 fdh400 r7 r11 l1 r12 r8 10k w r8 1.5k w q2 2n3904 r10 1.5k w 47 w 330nh 820 w c5 .1 m f b-output r14 1.5k w c8 .1 m f c7 33 m f 80v cva2411tx 1 2 5 6 7 8 9 3 4 10 11 c6 100 m f tab (heat sink) q1 2n3904 r1 100 w c2 120pf r13 120 w c1 120pf r3 56 w 33 w r2 r-input q1 2n3904 r1 100 w c2 120pf r13 120 w c1 120pf r3 56 w 33 w r2 g-input q1 2n3904 r1 100 w c2 120pf r13 120 w c1 120pf r3 56 w 33 w r2 b-input c3 .01 m f 12v 1.5k w 3w r5 1.5k w 3w r5 1.5k w 3w r5 1h-40 r4, c2 network will adjust the undershoot. r3, c1 network will adjust the overshoot. overshoot affects the emi, try to reduce overshoot as much as possible by adjusting r3, c1. notes: output peaking inductor is approx. (220nh to 680nh). dc bias circuit at the output is an example from several dc bias circuits available. r4 56 w r4 56 w r4 56 w gain = r5 r1 47 calogic corporation, 237 whitney place, fremont, california 94539, telephone: 510-656-2900, fax: 510-651-3025
cva2411tx corporation information furnished by calogic is believed to be accurate and reliable. however, no responsibility is assumed for its use: no r for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent right s of calogic. calogic corporation, 237 whitney place, fremont, california 94 539, telephone: 510- 656-2900, fax: 510-651-3025
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