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this is preliminary information on a new product now in development or undergoing evaluation. details are subject to change wit hout notice. october 2003 1/10 ? stv9380a class-d vertical deflection amplifier for 2.5 amp tv and monitor applications main features n high-efficiency power amplifier n no heatsink n split supply n internal flyback generator n output current up to 2.5 a pp n suitable for dc coupling applications n few external components n protection against low v cc description designed for tv and monitor applications, the stv9380a is a class-d vertical deflection booster assembled in a 20-pin plastic dip package. it operates with supplies up to 18 v and provides an output current up to 2.5 a pp to drive the yoke. the internal flyback generator avoids the need for an extra power supply. pdip 20 order code: stv9380a -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 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 7
pin functions stv9380a 2/10 1 pin functions note 1. the voltage reference, accessible on pin 8, is for internal use only. no additional components should be connected to this pin except the decoupling capacitor. 2 functional description the stv9380a is a vertical deflection circuit operating in class d. class d is a modulation method where the output transistors work in switching mode at high frequency. the output signal is restored by filtering the output square wave with an external lc filter. the major interest of this ic is the comparatively low power dissipation in regards to traditional amplifiers operating in class ab, eliminating the need of an heatsink. except for the output stage which uses class d modulation, the circuit operation is similar to the one of a traditional linear vertical amplifier. a (sawtooth) reference signal has to be applied to the circuit which can accept a differential or single ended signal. this sawtooth is amplified and applied as a current to the deflection yoke. this current is measured by means of a low value resistor. the resulting voltage is used as a feedback 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 internal flyback or flyback generator, 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. the output stage is composed of low-r on n-channel dmos transistors. table 1: stv9380a pin descriptions pin name function pin name function 1-v cc negative supply 11 sgnd signal ground 2-v cc negative supply 12 in- error amplifier inverting input 3-v cc negative supply 13 in+ error amplifier non-inverting input 4 out pwm output 14 ea out error amplifier output 5 cfly+ flyback capacitor 15 +v cc positive supply 6 cfly- flyback capacitor 16 +v cc pow positive power supply 7 boot bootstrap capacitor 17 -vccpow negative power supply 8 vreg internal voltage regulator 18 -v cc negative supply 9 feedcap feed-back integrating capacitor 19 -v cc negative supply 10 freq frequency setting resistor 20 -v cc negative supply
3/10 stv9380a functional description figure 1: test and application circuit diagram flyback flyback output modulator + _ drive generator detection +vcc +vcc power cflyback cfly+ 100nf vreg in+ in - 1 k 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 and 20 out 0.5 w deflect. yoke* cfly- +vcc 1mh input signal 1k w 220nf -vcc 100nf 100nf 1000 m f 1000 m f stv9380a 100 m f 14 11 9 17 560pf 150 w 200 w 15 16 8 stv9380a 5 6 7 4 13 12 150 w 10 v ref -vcc 470pf * deflection yoke characteristics: r = 5.5 w , l = 7mh 100nf sense resistor f vert = 50 hz
absolute maximum ratings stv9380a 4/10 3 absolute maximum ratings note 1. during the flyback with v cc = 18 v, the maximum output voltage (pin 4) is close to 72 v, with respect to -v cc (pins 1, 2, 3, 18, 19 and 20). 4 thermal data pins 1, 2, 3, 18, 19 and 20 are internally connected together and participate in heat evacuation. figure 2: thermal resistance with on-board square heatsink vs. copper area symbol parameter value unit v cc dc supply voltage 20 v t stg , t j storage and junction temperature -40 to +150 c t op operating temperature range -20 to +70 c v esd esd susceptibility - human body model (100 pf discharge through 1.5 k w) 2 kv i out output current 1.6 a v out maximum output voltage (pin 4) with respect to -vcc (pins 1, 2, 3, 18, 19 and 20) and during flyback (see note 1 ) 80 v symbol parameter value unit r thja junction-to-ambient thermal resistance 70 c/w 04812 area (cm2) 40 50 60 70 r thja (c/w) copper area 35 m thickness pc board
5/10 stv9380a electrical characteristics 5 electrical characteristics t amb = 25 c, v cc = 12 v and f vert = 50 hz unless otherwise specified (refer to figure 1 ) note 1. input voltage = 0, measured after the filter (e.g. across the 470 nf filter capacitor) 2. supply rejection of the positive or negative power supply. v cc ripple =1 v pp , f =100 hz, measured on the sense resistor. 3. power dissipated in the circuit in the case of the application from figure 1 and the current in the deflection yoke adjusted to 2.5 a pp . the corresponding power dissipated in the vertical deflection yoke is 2.8 w. symbol parameter test conditions min. typ. max. units +v cc positive supply range +10 +18 v -v cc negative supply range -18 -10 v d v cc maximum recommended difference between +v cc and |-v cc | 4 v v ccstart low v cc detection 6.5 v i q quiescent supply current input voltage = 0 14 ma i y maximum vertical yoke current 1.25 a i 13 , i 12 amplifier input bias current -0.1 m a v os output offset voltage note 1 -50 +50 mv svr supply voltage rejection note 2 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 p d integrated circuit dissipated power note 3 1.1 w f sw switching frequency r freq = 10 k w 120 140 160 khz f sw-op switching frequency operative range 100 200 khz r freq frequency controller resistor range pin 10 7 10 14 k w
i/o waveforms stv9380a 6/10 6 i/o waveforms the following waveforms are obtained with the schematic diagram given in figure 1: test and application circuit diagram . figure 3: current in the deflection yoke (calibration: 0.5 a/div.) figure 4: current and voltage in the deflection yoke during flyback (calibration: 0.5a/div, 10 v/div)
7/10 stv9380a i/o waveforms figure 5: current in the deflection yoke and voltage at the error amplifier output (pin 14 - stv9380a) during flyback (calibration: 0.5 a/div, 1 v/div) figure 6: current in the deflection yoke and voltage at the output of the stv9380a (pin 4), during the flyback (calibration: 0.5 a/div, 10 v/div)
package mechanical data stv9380a 8/10 7 package mechanical data figure 7: 20-pin plastic dual in-line package, 300-mil width table 2: dip20 package dim. mm inches min. typ. max. min. typ. max. a 5.33 0.210 a1 0.38 0.015 a2 2.92 3.30 4.95 0.115 0.130 0.195 b 0.36 0.46 0.56 0.014 0.018 0.022 b2 1.14 1.52 1.78 0.045 0.060 0.070 c 0.20 0.25 0.36 0.008 0.010 0.014 d 24.89 26.92 0.980 1.060 e 2.54 0.100 e1 6.10 6.35 7.11 0.240 0.250 0.280 l 2.92 3.30 3.81 0.115 0.130 0.150 number of pins n 20 d e3 sb2 b e a1 a a2 l c e1 e1 g e4 k1 k2
9/10 stv9380a package mechanical data figure 8: esd protection structure
revision history stv9380a 10/10 8 revision history 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 f rom 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 publication supersedes and replaces all information pr eviously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems with out express written approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics ? 2003 stmicroelectronics - all rights reserved 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 - u.s.a. www.st.com table 3: summary of modifications version date description 1.0 may 2003 first issue
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