march 2002 1/8 this is preliminary information on a new product now in development. details are subject to change without notice. version 3.0 STV9381 class-d vertical deflection amplifier for tv and monitor application preliminary data features n high efficiency power amplifier n no heatsink n split supply n internal flyback generator n output current up to 3 app n suitable for dc coupling application n few external components n protection against low vcc description designed for monitors and tvs, the STV9381 is a class-d vertical deflection booster assembled in pdip20 package. it operates with supplies up to +/- 18v, provides up to 3 app output current to drive the yoke. the internal flyback generator avoids the need for an extra power supply. pin connection pdip20 (14+3+3) order code: STV9381 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 -v cc -v cc -v cc -v cc -v cc -v cc -v cc pow +v cc pow +v cc eaout in+ in- sgnd out cfly + cfly - boot vreg feedcap freq 1
STV9381 2/8 1 pin functions 2 functional description the STV9381 is a vertical deflection circuit operating in class d. the class d is a modulation method where the output transistors work in switching mode at high frequency. the output signal is restored by fil- tering the output square wave with an external lc filter. the major interest of this ic is the low power dis- sipation comparatively to traditional amplifiers operating in class ab, eliminating the need of an heatsink. except for the output stage which uses the class d modulation, the circuit operation is similar to the one of a traditional linear vertical amplifier. a reference signal (sawtooth) has to be applied to the circuit which can accept a differential or single end- ed signal. this sawtooth is amplified and applied as a current to the deflection yoke. this current is meas- ured by means of a low value resistor. the resulting voltage is used as a feed-back signal to guarantee the conformity of the yoke current with the reference input signal. the overvoltage necessary for a fast retrace is obtained with a chemical capacitor charged at the power supply voltage of the circuit. at the flyback moment this capacitor is connected in series with the output stage power supply. this method, used for several years with the linear vertical boosters and called ain- ternal flybacko or aflyback generatoro, avoids the need of an additional power supply, while reducing the flyback duration. the circuit uses a bcd process that combines bipolar, cmos and dmos devices. dmos transistors are used in the output stage due to the absence of second breakdown. pin number name function 1-v cc negative supply 2-v cc negative supply 3-v cc negative supply 4 out pwm output 5 cfly+ flyback capacitor 6 cfly- flyback capacitor 7 boot bootstrap capacitor 8 vreg internal voltage regulator 9 feedcap feed-back integrating capacitor 10 freq frequency setting resistor 11 sgnd signal ground 12 in- error amplifier inverting input 13 in+ error amplifier non-inverting input 14 ea out error amplifier output 15 +v cc positive supply 16 +v cc pow positive power supply 17 -vccpow negative power supply 18 -v cc negative supply 19 -v cc negative supply 20 -v cc negative supply 2
STV9381 3/8 figure 1. test and application circuit flyback flyback output modulator + _ drive generator detection +vcc +vcc power cflyback cfly+ 100nf vreg in+ in - 1k w 10k w ea out -vcc power -vcc -vcc boot cboot 470nf 10k w 4.7nf freq feedcap sgnd pins 1,2,3,18,19,20 out 0.5 w deflect. yoke* cfly- +vcc 1mh input signal 1k w 220nf -vcc 100nf 100nf 1000 m f 1000 m f stv9380 100 m f 14 11 9 17 560pf 150 w 200 w 15 16 8 STV9381 5 6 7 4 13 12 150 w 10 vref -vcc 470pf * deflection yoke characteristics: r = 5.5 w , l = 7mh 100nf sense resistor f vert = 50hz 2
STV9381 4/8 figure 2. rth with aon boardo square heatsink vs. copper area 3 absolute maximum ratings note: 1 during the flyback with vcc= 18v, the maximum output voltage (pin 4) is close to 72v, with respect to -vcc (pins 1, 2, 3, 18, 19, 20). 4 thermal data pins 1, 2, 3, 18, 19, 20 are internally connected together and participate to heat evacuation. symbol parameter value unit vcc dc supply voltage 20 v t stg ,t j storage and junction temperature -40 to +150 c t op operating temperature range 0 to +70 c vesd esd susceptibility - human body model (100 pf discharge through 1.5 k w) 2kv iout output current 2a vout maximum output voltage (pin 4) with respect to -vcc (pins 1, 2, 3, 18, 19, 20) and during flyback (see note 1) 80 v symbol parameter value unit r th j-amb thermal resistance junction to ambient 70 c/w 0 4 8 12 area(cm 2 ) 40 50 60 70 r thj-a ( c/w) copper area 35 m m thickness pc board 2
STV9381 5/8 5 electrical characteristics (refer to figure 1 on page 3) tamb = 25 c unless otherwise specified, vcc = 12v, f vert =50hz note: 2 input voltage = 0, measured after the filter (e.g. accross the 470 nf filter capacitor) note: 3 supply rejection of the positive or negative power supply. vcc ripple =1vpp, f=100hz, measured on the sense resistor. symbol parameter test conditions min. typ. max. units +vcc positive supply range +10 +18 v -vcc negative supply range -18 -10 v d vcc maximum recommended difference between +vcc and 4v vcc start low vcc detection 6.5 v iq quiescent supply current input voltage = 0 14 ma iy maximum vertical yoke current 1.5 a i 13 ,i 12 amplifier input bias current -0.1 m a v os output offset voltage note 2 -50 +50 mv svr supply voltage rejection note 3 82 db fly thr flyback detection threshold (positive slope) v(14) 1.5 v fly thf flyback detection threshold (negative slope) v(14) 0.5 v fsw switching frequency r freq =10k w 120 140 160 khz fsw - op switching frequency operative range 100 200 khz r freq frequency controller resistor range pin 10 7 10 14 k w vcc 2
STV9381 6/8 6 package mechanical data dimensions millimeters inches notes min. typ. max. min. typ. max. a 5.334 0.210 3 a1 0.381 0.015 3 a2 2.921 3.302 4.953 0.115 0.130 0.195 b 0.381 0.457 0.559 0.015 0.018 0.022 b1 0.356 0.457 0.508 0.014 0.018 0.020 b2 1.397 1.524 1.651 0.055 0.060 0.065 8 c 0.203 0.254 0.305 0.008 0.010 0.012 c1 0.203 0.254 0.279 0.008 0.010 0.011 d 26.035 26.162 26.289 1.025 1.030 1.035 4 3
STV9381 7/8 note: 3 dimensions a, a1 & l are measured with the package seated in jedec seating plane gauge gs-3 note: 4 dimensions d, d1 and e1 are to be measured at maximum material condition but do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch /0.254 mm note: 5 e and ea measured with the leads constrained to be perpendicular to datum -c- note: 6 eb and ec are measured at the lead tips with the leads unconstrained note: 7 n is the maximum of number of lead positions note: 8 b2 maximum dimension does not include dambar protrusions. dambar protrusions shall not exceed 0.010inch / 0.25mm d1 0.762 0.889 1.016 0.030 0.035 0.040 4 e 7.62 8.255 0.300 0.325 5 e1 6.096 6.401 6.604 0.240 0.252 0.260 4 e 2.54 0.100 ea 7.62 0.300 5 eb 10.922 0.430 6 ec 0.000 1.524 0.000 0.060 6 l 3.175 3.429 0.125 0.135 3 n20 207 q1 1.397 1.524 1.651 0.055 0.060 0.065 dimensions millimeters inches notes min. typ. max. min. typ. max.
STV9381 8/8 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility 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 stmicroelectron- ics. specifications mentioned in this publication are subject to change without notice. this publication supersedes and re- places all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without the express written approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics ? 2002 stmicroelectronics - all rights reserved. purchase of i 2 c components by stmicroelectronics conveys a license under the philips i 2 c patent. rights to use these components in an i 2 c system is granted provided that the system conforms to the i 2 c standard specification as defined by philips. stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia - malta - morocco - singapore - spain sweden - switzerland - united kingdom - united states. http://www.st.com 4
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