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august 2001 1/22 this is preliminary information on a new product now in development. details are subject to change without notice. version 3.0 TDA9556 7.5 ns triple-channel high voltage video amplifier preliminary data features n triple-channel video amplifier n supply voltage up to 115 v n 80v output dynamic range n perfect for picture boost application requiring high video amplitude n pinning for easy pcb layout n supports dc coupling (optimum cost saving) and ac coupling applications. n built-in voltage gain: 20 (typ.) n rise and fall times: 7.5 ns (typ.) n bandwidth: 50 mhz (typ.) n very low stand-by power consumption n perfectly matched with the tda9210/tda9211 preamplifiers description the TDA9556 is a triple-channel video amplifier designed in a 120v-high voltage technology and able to drive in dc-coupling mode the 3 cathodes of a crt monitor. the TDA9556 supports picture boost applications where video amplitude up to 60v or above is required, ensuring a maximum quality of the still pictures or moving video. perfecly matched with the tda9210 and tda9211 st preamplifiers, it provides a highly performant and very cost effective video system. pin connections clipwatt 11 order code: TDA9556 (plastic package) 1 2 3 4 5 6 7 8 9 10 11 out1 out2 out3 gndp gnda in3 v dd gnds v cc in2 in1 1
table of contents 2 2/22 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................. 5 6 theory of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6.1 general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6.2 output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................. 8 7 power dissipation . . . . . . . . . . . . . . . . . . . . . . . . ................................. 9 8 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 9 internal schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 10 application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 10.1 how to choose the high supply voltage value (vdd) in dc coupling mode . . . . . . . . . . . . 12 10.2 arcing protection: schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 10.3 arcing protection: layout and decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... 13 10.4 video response optimization: schematics in dc-coupling mode . . . . . . . . . . . . . . . . . . . . 14 10.5 video response optimization: outputs and inputs networks . . . . . . . . . . . . . . . . . . . . . . . . 15 10.6 video response optimization: layout and decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 10.7 ac - coupling mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 10.8 conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ 17 11 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2
TDA9556 3/22 1 block diagram 2 pin description pin name function 1 in1 video input (channel 1) 2 in2 video input (channel 2) 3 vcc low supply voltage 4 in3 video input (channel 3) 5 gnda ground analog 6 gnds ground substrat 7 vdd high supply voltage 8 gndp ground power 9 out3 video output (channel 3) 10 out2 video output (channel 2) 11 out1 video output (channel 1) TDA9556 9 11 7 3 out3 gndp out2 out1 vdd vcc v ref 10 8 v dd gndp vdd gndp 2 4 in3 in2 in1 gnda gnds 5 6 1 3
TDA9556 4/22 3 absolute maximum ratings 4 thermal data symbol parameter value unit v dd high supply voltage 120 v v cc low supply voltage 16.5 v v esd esd susceptibility human body model (100pf discharged through 1.5k w) eiaj norm (200pf discharged through 0 w) 2 300 kv v i od output source current (pulsed < 50 m s) 80 ma i og output sink current (pulsed < 50 m s) 80 ma v in max maximum input voltage v cc +0.3 v v in min minimum input voltage - 0.5 v t j junction temperature 150 c t stg storage temperature -20 + 150 c symbol parameter value unit r th (j-c) junction-case thermal resistance (max.) 3 c/w r th (j-a) junction-ambient thermal resistance (typ.) 35 c/w 3
TDA9556 5/22 5 electrical characteristics note 1: the tda 9556 goes into stand-by mode when vcc is switched off (<1.5v). in stand-by mode, vout is set to low level. note 2: matching measured between each channel. note 3: pulsed current width < 50 m s symbol parameter test condit ions min. typ max unit supply parameters (v cc = 12v, v dd = 110v, tamb = 25 c, unless otherwise specified) v dd high supply voltage 20 110 115 v v cc low supply voltage 10 12 15 v i dd v dd supply current v out = 50v 25 ma i dds v dd stand-by supply current v cc : switched off (<1.5v) v out : low (note 1) 60 m a i cc v cc supply current v out = 50v 60 ma static parameters (v cc = 12v, v dd = 110v, tamb = 25 c) dv out /dv dd high voltage supply rejection v out =50v 0.5 % dv out /dt output voltage drift versus temperature v out = 80v 15 mv/ c d d v out /dt output voltage matching versus temperature (note 2) v out = 80v 0 mv/ c r in video input resistor v out =50v 2 k w v sath output saturation voltage to supply i 0 =-60ma (note 3) v dd -6.5 v v satl output saturation voltage to gnd i 0 =60ma (note 3) 11 v g video gain v out = 50v 20 le linearity error 17 v TDA9556 6/22 electrical characteristics (continued) note 4: matching measured between each channel. note 5: picture boost condition (video amplitude at 60v or above) is used in some applications when displaying still picture or moving video. in this condition the high level of contrast improves the pictures quality at the expense of the video performances (t r ,t f and overshoot) which are slightly deteriorated. figure 1. ac test circuit symbol parameter test condit ions min. typ max unit dynamic parameters (see figure 1 ) t r rise time v dc =50v, d v=40v pp 7.5 ns t f fall time v dc =50v, d v=40v pp 7.5 ns os r overshoot, white to black transition 5 % os f overshoot, black to white transition 1 % d g low frequency gain matching (note 4) v dc = 50v, f=1mhz 5 % bw bandwidth at -3db v dc =50v, d v=20v pp 50 mhz t set 2.5% settling time v dc =50v, d v=40v pp 15 ns ct l low frequency crosstalk v dc =50v, d v=20v pp f = 1 mhz 50 db ct h high frequency crosstalk v dc =50v, d v=20v pp f = 20mhz 32 db dynamic parameter in picture boost condition (note 5) t pb rise/fall time v dc =50v, d v=60v pp 10 ns os pb overshoot white to black or black to white transition v dc =50v, d v=60v pp 9% TDA9556 50 w in c l =8pf gndp out r p = 200 w 11 7 3 v dd v cc 110v 12v d v v dc v ref 8 1 5 gnda 3
TDA9556 7/22 6 theory of operation 6.1 general the TDA9556 is a three-channel video amplifier supplied by a low supply voltage: v cc (typ.12v) and a high supply voltage: v dd (up to 115v). the high values of v dd supplying the amplifier output stage allow direct control of the crt cathodes (dc coupling mode). in dc coupling mode, the application schematic is very simple and only a few external components are needed to drive the cathodes. in particular, there is no need of the dc-restore circuitry which is used in classical ac coupling applications. the output voltage range is wide enough (figure 2) to provide simultaneously : cut-off adjustment (typ. 25v) video contrast (typ. up to 40v), brightness (with the remaining voltage range). in normal operation, the output video signal must remain inside the linear region whatever the cut-off, brightness and contrast adjustments are. figure 2. output signal, level adjustments (a) top non-lin ear region linear region v dd (e) bottom non-linear region gnd blanking pulse video signal (b) cut-off adjust. (25v typ.) (c) brightness adjust. (10v typ.) (d) contrast adjust. (40v typ.) 15v 17v 3
TDA9556 8/22 6.2 output voltage a very simplified schematic of each TDA9556 channel is shown in figure 3. the feedback network of each channel is integrated with a typical built-in voltage gain of g=20 (40k/2k). the output voltage v out is given by the following formula: v out = (g+1) x v ref -(gxv in ) for g = 20 and v ref = 5.6v, we have v out = 117.6 - 20 x v in figure 3. simplified schematic of one channel 2k 40k gndp v dd in v ref gnda + - out
TDA9556 9/22 7 power dissipation the total power dissipation is the sum of the static dc and the dynamic dissipation: p tot =p stat +p dyn . the static dc power dissipation is approximately: p stat =v dd xi dd +v cc xi cc the dynamic dissipation is, in the worst case (1 pixel on/ 1 pixel off pattern): p dyn =3v dd xc l xv out(pp) x f x k (see note 6) where f is the video frequency and k the ratio between the active line and the total horizontal line duration. example: for v dd = 110v, v cc = 12v, i dd = 25ma, i cc = 60ma, v out =40v pp , f = 40mhz, c l = 8pf and k = 0.72. we have: p stat = 3.47w and p dyn = 3.04w therefore: p tot = 6.51w. note 6: this worst thermal case must only be considered for tjmax calculation. nevertheless, during the average life of the circuit, the conditions are closer to the white picture conditions.
TDA9556 10/22 8 typical performance characteristics v dd =110v, v cc =12v, c l =8pf, r p =300 w , d v=40v pp , unless otherwise specified - see figure 1 figure 4. TDA9556 pulse response figure 5. v out versus v in figure 6. power dissipation versus frequency figure 7. speed versus temperature figure 8. speed versus offset figure 9. speed versus load capacitance 7.5 7.5 0 20 40 60 80 100 120 0123456 vin (v) vout (v) 0 2 4 6 8 10 12 10 20 30 40 50 square wave frequency (mhz) total power dissipation (w) (72% active time) 6.5 6.7 6.9 7.1 7.3 7.5 7.7 7.9 8.1 8.3 8.5 60 70 80 90 100 110 120 cas e temperature ( c) speed (ns) tf tr 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 40 45 50 55 60 65 70 offset voltage (vdc) speed (ns) tf tr 6 6.5 7 7.5 8 8.5 9 9.5 10 8121620 load capacitance (mhz) speed (ns) tf tr rp = 100 ohms load capacitance (pf)
TDA9556 11/22 9 internal schematics figure 10. rgb inputs figure 11. rgb outputs figure 12. vdd figure 13. vcc figure 14. gndp figure 15. gnda vcc in pins 1, 2, 4 gnds out vdd pins 9, 10, 11 gnds gnds vdd vcc gnds gnds gndp gnda gnds
TDA9556 12/22 10 application hints 10.1 how to choose the high supply voltage value (v dd ) in dc coupling mode the v dd high supply voltage must be chosen carefully. it must be high enough to provide the necessary video adjustment but set to minimum value to avoid unecessary power dissipation. example (see figure 2): the following example shows how the optimum v dd voltage value is determined: cut-off adjustment range (b) : 25v max contrast (d) : 40v case 1: 10v brightness (c) adjusted by the preamplifier : v dd =a+b+c+d+e v dd = 15v + 25v + 10v + 40v + 17v = 107v case 2: 10v brightness (c) adjusted by the g1 anode: v dd =a+b+d+e v dd = 15v + 25v + 40v + 17v = 97v 10.2 arcing protection: schematics as the amplifier outputs are connected to the crt cathodes, special attention must be given to protect them against possible arcing inside the crt. protection must be considered when starting the design of the video crt board. it should always be implemented before starting to adjust the dynamic video response of the system. the arcing network that we recommend (see figure 16) provides efficient protection without deteriorating the amplifier video performances. the total resistance between the amplifier and the crt cathode (r10+r11) protects the device against overvoltages. we recommend to use r10+r11 > 200 w . spark gaps are strongly recommended for arcing protection.
TDA9556 13/22 figure 16. arcing protection network (one channel) 10.3 arcing protection: layout and decoupling several layout precautions have to be considered to get the optimum arcing protection: sparkgap grounding : when an arc occurs, the energy must flow through the crt ground without reaching the amplifier. this is obtained by connecting the sparkgap grounding (point b) to the crt ground (socket) via a wide/short trace. conversely the point b must be connected to the amplifier ground via a longer/narrower trace. grounding separation : in order to set apart the amplifer ground and crt ground, the r29/c29 net- work (figure 16) can be used. amplifier grounding : the 3 grounds gnds, gnda and gndp must be connected together as close as possible to the device. r11 r29(***) 110 w /0.5w c18 100nf c24 4.7 m f/150v c12(*) 100nf/250v r19(**) r10 110 w /0.5w l1 0.33 m h d12 fdh400 f1 TDA9556 v dd out spark gap ( * ): to be connected as close as possible to the device (**): r19 must be mandatorily used (***): ground separation network 33-40 w 200v c29(***) 0.22 m f 1-10 w crt gndp gnds gnda d13 fdh400 v dd a b
TDA9556 14/22 10.4 video response optimization: schematics in dc-coupling mode the dynamic video response is optimized by carefully designing the supply decoupling of the video board (see section 10.6), the tracks (see section 10.6), then by adjusting the input/output component network (see section 10.5). for dynamic measurements such as rise/fall time and bandwidth, a 8pf load is used (total load including the parasitic capacitance of the pc board and crt socket). figure 17. video response optimization for one channel - dc coupling application c11 4.7 m f r10 l1 r11 crt out v cc tda9210 TDA9556 in 110 w 110 w 0.33 m h v ref gndp gnds gnda c10(*) 100nf - + r1 51 w c1 1.5nf reference out c2 10pf r1 82 w l1 0.33 m h input network #2 c2 10pf r1 33 w input network #3 in in c24 4.7 m f v dd c12(*) 100nf r19(**) 33-40 w 2 other input networks (network #2 and #3 below) can be used in replacement of the reference input network #1. c2 15pf ( * ): to be connected as close as possible to the device (**): r19 must be mandatorily used see application note an1445 for complete description. input network #1 v dd
TDA9556 15/22 10.5 video response optimization: outputs and inputs networks the output network (r10/l1/r11) is used to adjust the amplifier video performances. once r10 and r11 resistors are set to protect the application against arcing (r10 + r11>200 w ), it is possible to increase the bandwidth by increasing l1. the input network also plays an important role in the device dynamic behaviour. we recommend to use the reference input network #1, which is described in figure 17, but 2 other networks (#2 and #3) can be used to better match the required performances and the video board layout. refer to the application note referenced an1445 for the complete description of these input networks. 10.6 video response optimization: layout and decoupling the decoupling of v cc and v dd through good quality hf capacitors (respectively c10 and c12) close to the device is necessary to improve the dynamic performance of the video signal. careful attention has to be given to the three output channels of the amplifier. capacitor : the parasitic capacitive load on the amplifier outputs must be as small as possible. figure 9 from section 8 clearly shows the deterioration of the t r /t f when the capacitive load increases. reducing this capacitive load is achieved by moving away the output tracks from the other tracks (especially ground) and by using thin tracks (<0.5mm), see figure 17. cross talk : output and input tracks must be set apart. the TDA9556 pin-out allows the easy separa- tion of input and output tracks on opposite sides of the amplifier (see figure 20). length : connection between amplifier output and cathode must be as short and direct as possible.
TDA9556 16/22 10.7 ac - coupling mode the TDA9556 can be used in ac-coupling mode in kit with the tda9207 preamplifier from st. as for the dc-coupling mode, the TDA9556 drives perfectly the video signal in picture boost conditions. a typical schematic is given on the figure 18 below. figure 18. video response optimization for one channel - ac coupling application the advantage of such an architecture is to use smaller v dd and therefore to have smaller power consumption. this is due to the fact that the TDA9556 provides only the video signal and not the cut-off adjustment. the disadvantage is to have an application with more components (dc restore circuitry). note that it is mandatory to keep the output video signal (point c) inside the linear area of the amplifier (from 15v to v dd - 15v). c24 4.7 m f c11 4.7 m f r10 l1 r11 crt out v cc v dd tda9207 TDA9556 in 110 w 110 w 0.33 m h v ref gndp gnds gnda c10(*) 100nf c12(*) 100nf - + dc restore circuitry cut-off v restore c1 1 m f out r1 51 w c1 1.5nf input network #1 c2 10pf r19(**) 33-40 w ( * ): to be connected as close as possible to the device (**): r19 must be mandatorily used (***): input networks #2 and #3 can be used as well (***) c v dd
TDA9556 17/22 10.8 conclusion video response is always a compromise between several parameters. for example, the rise/fall time improvement leads to the overshoot deterioration. the recommended way to optimize the video response is: 1 to set r10+r11 for arcing protection (min. 250 w ) 2. to adjust r20 and r10+r11. increasing their value increases the t r /t f values and decrease the overshoot 3. to adjust l1 increasing l1 speeds up the device and increases the overshoot. 4. to adjust the input network for the final dynamic tunning (e.g.: critical damping) we recommend our customers to use the schematic shown on figure 22 as a starting point for the video board and then to apply the optimization they need.
TDA9556 18/22 figure 19. TDA9556/9555/9553 + tda9210 dc-coupling demonstration board: silk screen and trace figure 20. outputs trace (from figure 19) figure 21. crt socket trace (from figure 19)
TDA9556 19/22 figure 22. TDA9556/9555/9553 + tda9210 dc-coupling demonstration board schematic de version 1.4 evalcrt51 / tda955x demoboard (ab25) a4 11 friday, august17, 2001 b cmg - imaging& displaydivision (idd) 38019 grenoblecedex france 12, rue jules horowitz- b.p. 217 monitor businessunit- video application st microelectronics title size documentnumber rev date: sheet of scl blue red green sda hs vs blk blk rk gk bk vs sda rp hfly scl avdd vco hfly rp vco avdd heater hs bk g1 gk rk heater g1 abl abl 5v 8v 12v 8v 5v 110v 5v 5v 12v 110v 110v 3.3v 3.3v 3.3v 110v 5v 110v 5v 5v 110v d8 1n4148 c21 10nf / 250v optionnal r4 2r7 r16 2r7 f3 1.5kv c18 4.7uf / 160v r25 100r r6 110r / 0.25w r14 110r / 0.25w r22 110r / 0.25w c2 100nf r23 110r / 0.25w r15 110r / 0.25w r7 110r / 0.25w c26 100pf d2 fdh400 d7 fdh400 c28 100nf d9 fdh400 u2 tda955x 1 2 4 3 7 5 6 8 11 10 9 in 1 in 2 in 3 vcc vdd gnda gnds gndp out 1 out 2 out 3 c20 4.7nf/ 1kv c7 100nf j17 sync 1 2 3 4 5 6 7 c14 1 00nf c29 100pf j5 56 7 8 9 10 11 12 1 g1 g g2 r h2 h1 b gnd gnd c11 47uf / 25v d5 1n4148 c33 1.5nf c30 100pf l4 1uh j7 gnd j8 g2 f1 200v c27 47uf / 25v f2 200v f4 200v c1 100pf r3 75r r5 75r r10 75r r28 0r r11 2r7 c23 10pf c5 100nf r19 2k7 r21 2k7 c12 100pf c13 100pf j10 i2c 1 2 3 4 c24 10pf c10 10nf / 250v c9 100nf c19 4.7nf / 2kv r1 100r c36 1.5nf c8 47uf / 25v c15 47uf/ 25v c16 47uf/ 25v l5 1uh l1 0.33uh r27 150r / 0.25w r43 c32 l2 0.33uh r35 100r c22 100nf c34 u4 78l33 1 2 3 i c o r44 c25 10pf r45 r31 30k .5w r33 1k r26 39r r46 l3 0.33uh r9 51r r34 1k r13 51r c35 r17 51r d11 1n4004 hs1 radab20 1 2 3 u3 stv9936 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 sda scl vsync hfly dvdd dvss test ovdd agnd rp vco avdd fblk bout gout rout r2 15r j16 power 1 2 3 4 5 6 7 8 r8 15r c31 1.5nf r12 15r c4 100nf c6 100nf j1 video 1 2 3 4 5 6 c3 100nf r41 100r u1 tda9210 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 in1 abl in2 gndl in3 gnda vcca osd1 osd2 osd3 fblk scl sda out3 gndp out2 vccp out1 hs/clp blk r32 1k d3 1n4148 d1 1n4148 d4 1n4148 d6 1n4148
TDA9556 20/22 11 package mechanical data 11 pin - clipwatt dimensions millimeters inches min. typ. max. min. typ. max. a 2.95 3.00 3.05 0.116 0.118 0.120 b 0.95 1.00 1.05 0.037 0.039 0.041 c 0.15 0.006 d 1.30 1.50 1.70 0.051 0.059 0.066 e 0.49 0.515 0.55 0.019 0.020 0.021 f 0.78 0.80 0.88 0.031 0.033 0.034 g 1.60 1.70 1.80 0.063 0.067 0.071 g1 16.90 17.00 17.10 0.665 0.669 0.673 h1 12.00 0.472 h2 18.55 18.60 18.65 0.730 0.732 0.734 h3 19.90 20.00 20.10 0.783 0.787 0.791 (5) l 17.70 17.90 18.10 0.696 0.704 0.712 l1 14.35 14.55 14.65 0.564 0.572 0.576 l2 10.90 11.00 11.10 0.429 0.433 0.437(5) l3 5.40 5.50 5.60 0.212 0.216 0.220 m 2.34 2.54 2.74 0.092 0.100 0.107 m1 2.34 2.54 2.74 0.092 0.100 0.107 r 1.45 0.057 r1 3.20 3.30 3.40 0.126 0.130 0.134 g1 f g2 g lead#1 r1 l2 l3 s v1 h3 h2 h1 r2 r v a c v2 v1 v1 v1 v d r3 b r3 r3 e m m1 l1 l
TDA9556 21/22 note 5: ah3 and l2o do not include mold flash or protrusions mold flash or protrusions shall not exceed 0.15mm per side. r2 0.30 0.012 r3 0.50 0.019 s 0.65 0.70 0.75 0.025 0.027 0.029 v 10deg. 10deg. v1 5deg. 5deg. v2 75deg. 75deg. dimensions millimeters inches min. typ. max. min. typ. max.
TDA9556 22/22 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibi lity for the consequences of use of such information nor 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 or patent rights of stmicroelectronics. specifications mentioned in this publication are subject to change without notice. this public ation supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical component s in life support devices or systems withou t express written approval of stmicroelectronics. the st logo is a trademark of stmicroelectronics. ? 2001 stmicroelectronics - all rights reserved purchase of i 2 c components of stmicroelectronics, conveys a license under the philips i 2 c patent. rights to use these components in a i 2 c system, is granted provided that the system conforms to the i 2 c standard specifications as defined by philips. stmicroelectronics group of companies australia - brazil - china - finland - france - germany - italy - japan - korea - malaysia - malta - mexico - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. http:// www.st.com 4

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