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november 2008 rev 4 1/19 1 sTV8172A vertical deflection booster for 3 app tv/monitor applications with 70 v flyback generator features power amplifier flyback generator stand-by control output current up to 3.0 app thermal protection description designed for monitors and high performance tvs, the sTV8172A vertical deflection booster delivers flyback voltages up to 70v. the sTV8172A operates with supplies up to 35v and provides up to 3 a pp output current to drive the yoke. the sTV8172A is offered in a heptawatt plastic package. in double-supply applications, a stand-by state will be reached by stopping the (+) supply alone. figure 1. heptawatt package figure 2. sTV8172A pin detail heptawatt (plastic package) order code: sTV8172A 7 6 5 4 3 2 1 tab connected input (non inverting) output stage supply output ground flyback generator supply voltage input (inverting) to pin 4 7 thermal protection 6 4 3 5 sTV8172A + - power amplifier 1 flyback generator non-inverting inverting input input ground or negative supply output flyback generator output stage supply voltage supply 2 www.st.com
contents sTV8172A 2/19 contents 1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.1 dc-coupled application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.1.1 application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.1.2 ripple rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.2 ac-coupled applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.2.1 application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.3 application with differential-output drivers . . . . . . . . . . . . . . . . . . . . . . . . 11 4.3.1 centering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.3.2 peak current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.3.3 ripple rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.3.4 secondary breakdown diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5 mounting instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.1 lead-free packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
sTV8172A absolute maximum ratings 3/19 1 absolute maximum ratings note: 1 usually the flyback voltage is slightly more than 2 x vs. this must be taken into consideration when setting v s . 2 versus pin 4 3 v3 is higher than v s during the first half of the flyback pulse. 4 such repetitive output peak currents are usually observed just before and after the flyback pulse. 5 this non-repetitive output peak current can be observed, for example, during the switch- on/switch-off phases. this peak current is acceptable providing the soa is respected ( figure 10 and figure 11 ). 6 all pins have a reverse diode towards pin 4, these diodes should never be forward-biased. 7 input voltages must not exceed the lower value of either v s + 2 or 40 volts. table 1. absolute maximum ratings symbol parameter value unit voltag e v s supply voltage (pin 2) - note 1 and note 2 40 v v 5 , v 6 flyback peak voltage - note 2 70 v v 3 voltage at pin 3 - note 2, note 3 and note 6 -0.4 to (v s + 3) v v 1 , v 7 amplifier input voltage - note 2, note 6 and note 7 - 0.4 to (v s + 2) or +40 v current i 0 (1) output peak current at f = 50 to 200 hz, t 10s - note 4 5 a i 0 (2) output peak current non-repetitive - note 5 2 a i 3 sink sink current, t<1ms - note 3 2 a i 3 source source current, t < 1ms 2 a i 3 flyback pulse current at f=50 to 200 hz, t 10 s - note 4 5 a esd susceptibility esd1 human body model (100 pf discharged through 1.5 k )2 kv esd2 eiaj standard (200 pf discharged through 0 )300 v temperature t s storage temperature -40 to 150 c t j junction temperature +150 c
thermal data sTV8172A 4/19 2 thermal data table 2. thermal data symbol parameter value unit r thjc junction-to-case thermal resistance 3 c/w t t temperature for thermal shutdown 150 c t j recommended max. junction temperature 120 c
sTV8172A electrical characteristics 5/19 3 electrical characteristics v s = 34 v, t amb = 25c, unless otherwise specified. table 3. electrical characteristics symbol parameter test conditions min. typ. max. unit figure supply v s operating supply voltage range (v 2 -v 4 ) see note below (1) 10 35 v i 2 pin 2 quiescent current i 3 = 0, i 5 = 0 5 20 ma figure 3 i 6 pin 6 quiescent current i 3 = 0, i 5 = 0, v 6 =35v 81950ma figure 3 input i 1 input bias current v 1 = 1 v, v 7 = 2.2 v - 0.6 -1.5 a figure 3 i 7 input bias current v 1 = 2.2 v, v 7 = 1 v - 0.6 -1.5 a v ir operating input voltage range 0 v s - 2 v v i0 offset voltage 2 mv v i0 /dt offset drift versus temperature 10 v/c output i 0 operating peak output current 0 o electrical characteristics sTV8172A 6/19 figure 3. measurement of i 1 , i 2 and i 6 figure 4. measurement of v 5h figure 5. measurement of v 3l and v 5l 1v (a) 39k 5 1 (b) i1 (a): i2 and i6 measurement (b): i1 measurement s +vs 2 6 i2 i6 4 7 2.2v sTV8172A 5.6k - i5 5 1v 7 2.2v 1 4 +vs 2 6 v 5h sTV8172A +vs i3 or i5 3 5 v 5l v 3l (a) (b) (a): v 5l measurement (b): v 3l measurement sTV8172A 1v 7 4 2 6 2.2v 1
sTV8172A application hints 7/19 4 application hints the yoke can be coupled either in ac or dc. 4.1 dc-coupled application when dc coupled (see figure 6 ), the display vertical position can be adjusted with input bias. on the other hand, 2 supply sources (v s and -v ee ) are required. a standby state will be reached by switching off the positive su pply alone. in this state, where both inputs are the same voltage as pin 2 or highe r, the output will sink negligible current from the deviation coil. figure 6. dc-coupled application r3 +vs r2 r1 rd(*) yo k e ly vertical position adjustment -v ee vref (*) recommended: ly 50 s ------------- r d ly 20 s ------------- < < 0.1f 0.1f c f (47 to 100f) power amplifier flyback generator thermal safety 470f 470f output current output voltage i p 7 32 5 6 1 4 v m v m + - 0.22f 1.5
application hints sTV8172A 8/19 4.1.1 application hints for calculations, treat the ic as an op-amp, where the feedback loop maintains v 1 = v 7 . centering display will be centered (null mean curren t in yoke) when voltage on pin 7 is (r 1 is negligible): peak current example: for v m =2v, v m = 5 v and i p =1a choose r 1 in the1 range, for instance r 1 =1 from equation of peak current: then choose r 2 or r 3 . for instance, if r 2 = 10 k , then r 3 = 15 k finally, the bias voltage on pin 7 should be: v 7 v m v m + 2 ------------------------ r 2 r 2 r 3 + --------------------- - ?? ?? ?? = i p v m v m ? () 2 ---------------------------- - r 2 r 1 xr 3 ------------------- = r 2 r 3 ------- 2i p r 1 v m v m ? ------------------------------- 2 3 -- - = = v 7 v m v m + 2 ------------------------ 1 1 r 3 r 2 ------- + ----------------- 7 2 --- - 1 2.5 ------- - 1.4v = = =
sTV8172A application hints 9/19 4.1.2 ripple rejection when both ramp signal and bias are provided by the same driver ic, you can gain natural rejection of any ripple caused by a voltage drop in the ground (see figure 7 ), if you manage to apply the same fraction of ripple voltage to both booster inputs. for that purpose, arrange an intermediate point in the bias resistor bridge, such that (r 8 / r 7 ) = (r 3 / r 2 ), and connect the bias filtering capacitor between the intermediate point and the local driver ground. of course, r 7 should be connected to the booster refer ence point, which is the ground side of r 1 . figure 7. ripple rejection r 3 r 2 r 1 rd yo k e ly power amplifier flyback generator thermal safety 7 32 5 6 1 4 + - r 7 r 8 r 9 reference voltage ramp signal driver ground source of ripple
application hints sTV8172A 10/19 4.2 ac-coupled applications in ac-coupled applications (see figure 8 ), only one supply (v s ) is needed. the vertical position of the scanning cannot be adjusted with input bias (for that purpose, usually some current is injected or sunk with a resistor in the low side of the yoke). figure 8. ac-coupled application 4.2.1 application hints gain is defined as in the previous case: choose r 1 then either r 2 or r 3 . for good output centering, v 7 must fulfill the following equation: r 3 +vs r 2 r 1 rd(*) yo k e ly (*) recommended: ly 50 s ------------- r d ly 20 s ------------- < < 0.1f c f (47 to 100f) power amplifier flyback generator thermal safety 470f output current output voltage i p 7 32 5 6 1 4 v m v m + - c s r 4 c l r 5 0.22f 1.5 i p v m v m ? 2 ----------------------- - r 2 r 1 r 3 ---------------------- - = v s 2 ------- -v 7 ? r 4 r 5 + --------------------- - v 7 v m v m + 2 ------------------------ ? r 3 -------------------------------------- v 7 r 2 ------- + =
sTV8172A application hints 11/19 or c s performs an integration of the parabolic signal on c l , therefore the amount of s correction is set by the combination of c l and c s . 4.3 application with differential-output drivers certain driver ics provide the ramp signal in differential form, as two current sources i + and i ? with opposite variations. figure 9. using a differential-output driver some definitions: i cm is the common-mode current: at peak of signal, i + =i cm +i p and i ? =i cm -i p , therefore the peak differential signal is i p -(-i p )=2i p , and the peak-peak differential signal, 4i p . the application is described in figure 9 with dc yoke coupling. the calculations still rely on the fact that v 1 remains equal to v 7 . v 7 1 r 3 ------- ? ? 1 r 2 ------- + 1 r 4 r 5 + --------------------- - ? ? v s 2r 4 r 5 + () ------------------------------ v m v m + 2r 3 ------------------------ + ?? ?? ?? = + +vs r 2 r 1 rd(*) yo k e ly -v ee 0.22f (*) recommended: ly 50 s ------------- r d ly 20 s ------------- < < 0.1f 0.1f c f (47 to 100f) power amplifier flyback generator thermal safety + - 470f 470f output current output voltage i p 7 32 5 6 1 4 r 7 + - differential output driver ic i p i cm -i p i cm 1.5 i cm 1 2 -- -i + i - + () =
application hints sTV8172A 12/19 4.3.1 centering when idle, both driver outputs provide i cm and the yoke current should be null (r 1 is negligible), hence: 4.3.2 peak current scanning current should be i p when positive and negative driver outputs provide respectively i cm -i p and i cm +i p , therefore choose r 1 in the 1 range, the value of r 2 = r 7 follows. remember that i is one-quarter of driver peak-peak differential signal! also check that the voltages on the driver outputs remain inside allowed range. example : for i cm = 0.4ma, i = 0.2ma (corresponding to 0.8ma of peak-peak differential current), i p =1a choose r 1 = 0.75 , it follows r 2 = r 7 = 1.875k . 4.3.3 ripple rejection make sure to connect r 7 directly to the ground side of r 1 . i cm r 7 ? i cm r 2 therefore r 7 r 2 = ? = i cm i ? () r 7 ? i p r 1 ? i cm i + () r 2 ? + = i p i ---- - 2r 7 r 1 ----------- ? = and since r 7 = r 2
sTV8172A application hints 13/19 4.3.4 secondary breakdown diagrams figure 10. output transistor safe operating area (soa) for secondary breakdown the diagram has been arbitrarily limited to max i0 (2a). figure 11. secondary breakdown temperature derating curve (isb = secondary breakdown current)
mounting instructions sTV8172A 14/19 5 mounting instructions the power dissipated in the circuit is remove d by adding an external heatsink. with the heptawatt package, the heatsink is simply attached with a screw or a compression spring (clip). a layer of silicon grease inse rted between heatsink and pack age optimizes th ermal contact. in dc-coupled applications we recommend to use a silicone tape between the device tab and the heatsink to electrically isolate the tab. figure 12. mounting examples
sTV8172A pin configuration 15/19 6 pin configuration figure 13. pins 1 and 7 figure 14. pins 3, 5 and 6 1 7 2 3 2 6 5 4 2
package mechanical data sTV8172A 16/19 7 package mechanical data figure 15. 7-pin heptawatt package a l l1 c d1 l5 l2 l3 d e m1 m h3 dia. l7 l11 l10 l6 h2 f gg1 g2 e1 f e l9 v4 l4 h2 table 4. heptawatt package dim. mm inches min. typ. max. min. typ. max. a 4.8 0.189 c 1.37 0.054 d 2.40 2.80 0.094 0.110 d1 1.20 1.35 0.047 0.053 e 0.35 0.55 0.014 0.022 e1 0.70 0.97 0.028 0.038 f 0.60 0.80 0.024 0.031
sTV8172A package mechanical data 17/19 7.1 lead-free packaging to meet environmental requirements, st offers these devices in ecopack? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com. g 2.34 2.54 2.74 0.095 0.100 0.105 g1 4.88 5.08 5.28 0.193 0.200 0.205 g2 7.42 7.62 7.82 0.295 0.300 0.307 h2 10.40 0.409 h3 10.05 10.40 0.396 0.409 l 16.70 16.90 17.10 0.657 0.668 0.673 l1 14.92 0.587 l2 21.24 21.54 21.84 0.386 0.848 0.860 l3 22.27 22.52 22.77 0.877 0.891 0.896 l4 1.29 0.051 l5 2.60 2.80 3.00 0.102 0.110 0.118 l6 15.10 15.50 15.80 0.594 0.610 0.622 l7 6.00 6.35 6.60 0.0236 0.250 0.260 l9 0.20 0.008 l10 2.10 2.70 0.082 0.106 l11 4.30 4.80 0.169 0.190 m 2.55 2.80 3.05 0.100 0.110 0.120 m1 4.83 5.08 5.33 0.190 0.200 0.210 v4 40 (typ.) dia. 3.65 3.85 0.144 0.152 table 4. heptawatt package (continued) dim. mm inches
revision history sTV8172A 18/19 8 revision history table 5. document revision history date revision changes august 2003 1 first issue. november 2003 1.1 datasheet status changed to preliminary data. december 2003 1.2 modification to figure 13 . june 2004 1.3 datasheet status changed to datasheet. february 2005 2 updated figure 9 . march 2005 3 status changed to datasheet. 13-nov-2008 4 section 7.1 added, new template applied.
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