STV9381

STV9381 CLASS-D VERTICAL DEFLECTION AMPLIFIER FOR TV AND MONITOR APPLICATION FEATURES s s s s s s s s HIGH EFFICIENCY POWER AMPLIFIER NO HEATSINK SPLIT SUPPLY INTERNAL FLYBACK GENERATOR OUTPUT CURRENT UP TO 3 APP SUITABLE FOR DC COUPLING APPLICATION FEW EXTERNAL COMPONENTS PROTECTION AGAINST LOW Vcc PDIP20 (14+3+3) ORDER CODE: STV9381 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 -VCC -VCC -VCC 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 -VCC -VCC -VCC -VCCPOW + VCC POW +VCC EAout IN+ INSGND Version 3.0 September 2003 1/8 1 STV9381 1 PIN FUNCTIONS Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name -VCC -VCC -VCC OUT CFLY+ CFLYBOOT VREG FEEDCAP FREQ SGND ININ+ EA out +VCC +VCCPOW -VccPOW -VCC -VCC -VCC Negative supply Negative supply Negative supply PWM Output Flyback capacitor Flyback capacitor Bootstrap capacitor Internal voltage regulator Feed-back integrating capacitor Frequency setting resistor Signal Ground Error amplifier inverting input Error amplifier non-inverting input Error amplifier output Positive supply Positive Power supply Negative Power supply Negative supply Negative supply Negative supply Function 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 filtering the output square wave with an external LC filter. The major interest of this IC is the low power dissipation 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 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 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 “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. DMOS transistors are used in the output stage due to the absence of second breakdown. 2/8 2 Figure 1. Test and application circuit +VCC 1000µF -VCC +VCC power STV9380 STV9381 100nF 100nF +VCC 15 16 VREG -VCC 100nF 8 Vref Flyback detection Flyback generator 5 6 CFLY+ CFLYBACK 100µF CFLYBOOT IN+ 13 1kΩ Input signal IN 12 EA out 14 10kΩ 1kΩ 11 SGND FEEDCAP 470pF 4.7nF 9 Pins 1,2,3,18,19,20 10 FREQ 10kΩ -VCC 100nF 17 + _ Modulator Output drive 7 OUT 4 150Ω Cboot 220nF 1mH 470nF 150Ω Deflect. Yoke* 200Ω 560pF -VCC power 1000µF Sense resistor 0.5Ω -VCC STV9381 * Deflection yoke characteristics: R = 5.5Ω, L = 7mH fvert = 50Hz 3/8 2 STV9381 Figure 2. Rth with “on board” Square Heatsink vs. copper area Rthj-a (°C/W) COPPER AREA 35µm THICKNESS 70 60 PC BOARD 50 40 0 4 8 12 Area(cm2) 3 ABSOLUTE MAXIMUM RATINGS Symbol VCC Tstg, Tj Top VESD Iout Vout DC Supply Voltage Storage and Junction Temperature Operating Temperature Range ESD Susceptibility - Human Body Model (100 pF discharge through 1.5 kΩ) Output current Maximum output voltage (pin 4) with respect to -Vcc (pins 1, 2, 3, 18, 19, 20) and during flyback (see Note 1) Parameter Value ±20 -40 to +150 0 to +70 ±2 ±2 80 Unit V °C °C kV A V 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 Symbol Rth j-amb Parameter Thermal resistance Junction to ambient Value 70 Unit °C/W Pins 1, 2, 3, 18, 19, 20 are internally connected together and participate to heat evacuation. 4/8 2 STV9381 5 ELECTRICAL CHARACTERISTICS (refer to Figure 1 on page 3) Tamb = 25°C unless otherwise specified, Vcc = ±12V, fvert=50Hz Symbol +Vcc -Vcc ∆Vcc Vccstart Iq Iy I13, I12 VOS SVR Flythr Flythf Fsw Fsw - op Rfreq Parameter Positive supply range Negative supply range Maximum recommended difference between +Vcc and – Vcc Low Vcc detection Quiescent supply current Maximum vertical yoke current Amplifier Input bias current Output Offset voltage Supply voltage rejection Flyback detection threshold (positive slope) Flyback detection threshold (negative slope) Switching frequency Switching frequency operative range Frequency controller resistor range Note 2 Note 3 V(14) V(14) Rfreq = 10kΩ Pin 10 120 100 7 -50 82 1.5 0.5 140 10 160 200 14 Input voltage = 0 Test Conditions Min. +10 -18 Typ. Max. +18 -10 ±4 ±6.5 14 ±1.5 -0.1 +50 Units V V V V mA A µA mV dB V V kHz kHz kΩ Note: 2 Note: 3 Input voltage = 0, measured after the filter (e.g. accross the 470 nF filter capacitor) Supply rejection of the positive or negative power supply. Vcc ripple =1Vpp, f=100Hz, measured on the sense resistor. 5/8 2 STV9381 6 PACKAGE MECHANICAL DATA Dimensions A A1 A2 b b1 b2 c c1 D Min. 0.381 2.921 0.381 0.356 1.397 0.203 0.203 26.035 Millimeters Typ. Max. 5.334 4.953 0.559 0.508 1.651 0.305 0.279 26.289 Min. 0.015 0.115 0.015 0.014 0.055 0.008 0.008 1.025 Inches Typ. Max. 0.210 0.195 0.022 0.020 0.065 0.012 0.011 1.035 Notes 3 3 3.302 0.457 0.457 1.524 0.254 0.254 26.162 0.130 0.018 0.018 0.060 0.010 0.010 1.030 8 4 6/8 3 STV9381 Millimeters Typ. 0.889 6.401 2.54 7.62 Inches Typ. 0.035 0.252 0.100 0.300 Dimensions D1 E E1 e eA eB eC L N Q1 Min. 0.762 7.62 6.096 Max. 1.016 8.255 6.604 Min. 0.030 0.300 0.240 Max. 0.040 0.325 0.260 Notes 4 5 4 5 6 6 3 7 0.000 3.175 1.397 20 1.524 10.922 1.524 3.429 1.651 0.000 0.125 0.055 20 0.060 0.430 0.060 0.135 0.065 Note: 3 Note: 4 Note: 5 Note: 6 Note: 7 Note: 8 Dimensions A, A1 & L are measured with the package seated in JEDEC seating plane gauge GS-3 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 E and eA measured with the leads constrained to be perpendicular to datum -ceB and eC are measured at the lead tips with the leads unconstrained N is the maximum of number of lead positions b2 maximum dimension does not include DAMBAR protrusions. DAMBAR protrusions shall not exceed 0.010inch / 0.25mm 7/8 STV9381 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 STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. 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