STV9381 CLASS-D VERTICAL DEFLECTION AMPLIFIER FOR TV AND MONITOR APPLICATION FEATURES ■ ■ ■ ■ ■ ■ ■ ■ 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 1 20 -VCC -VCC 2 19 -VCC -VCC 3 18 -VCC OUT 4 17 -VCCPOW CFLY + 5 16 + VCC POW CFLY - 6 15 +VCC BOOT 7 14 EAout VREG 8 13 IN+ 9 12 10 11 INSGND FEEDCAP FREQ Version 3.0 September 2003 1/8 1 STV9381 1 PIN FUNCTIONS Pin Number Name 1 -VCC Negative supply 2 -VCC Negative supply 3 -VCC Negative supply 4 OUT PWM Output 5 CFLY+ Flyback capacitor 6 CFLY- Flyback capacitor 7 BOOT Bootstrap capacitor 2 8 VREG 9 FEEDCAP Function Internal voltage regulator 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 +VCC Positive supply 16 +VCCPOW Positive Power supply 17 -VccPOW Negative Power supply 18 -VCC Negative supply 19 -VCC Negative supply 20 -VCC Negative supply 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 100nF 1000µF 100nF 15 -VCC +VCC 16 +VCC power STV9380 STV9381 VREG -VCC 8 Flyback detection Vref 100nF Flyback generator CFLY+ 5 6 CFLYBACK 100µF CFLYBOOT IN+ 1kΩ IN - + Output drive Modulator _ 12 Input signal Cboot 220nF 7 13 OUT 4 EA out 1mH 150Ω 470nF 14 10kΩ 1kΩ 150Ω Deflect. Yoke* 200Ω Pins 1,2,3,18,19,20 9 11 SGND 10 FEEDCAP 470pF 4.7nF 560pF 17 FREQ 10kΩ -VCC -VCC power 100nF 1000µF Sense resistor 0.5Ω -VCC 2 3/8 fvert = 50Hz STV9381 * Deflection yoke characteristics: R = 5.5Ω, L = 7mH STV9381 Figure 2. Rth with “on board” Square Heatsink vs. copper area Rthj-a (°C/W) COPPER AREA 35µm THICKNESS 70 PC BOARD 60 50 40 0 3 8 12 Area(cm2) ABSOLUTE MAXIMUM RATINGS Symbol VCC Tstg, Tj Parameter DC Supply Voltage Unit ±20 V °C 0 to +70 °C ESD Susceptibility - Human Body Model (100 pF discharge through 1.5 kΩ) ±2 kV Iout Output current ±2 A 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 Operating Temperature Range VESD Note: 1 Storage and Junction Temperature Value -40 to +150 Top 4 4 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). THERMAL DATA Symbol Parameter Rth j-amb Thermal resistance Junction to ambient Value Unit 70 °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 Parameter Positive supply range Negative supply range Maximum recommended difference between +Vcc and – Vcc Vccstart Low Vcc detection Iq Iy I13, I12 Quiescent supply current Maximum vertical yoke current Test Conditions Min. +10 -18 Input voltage = 0 Amplifier Input bias current Typ. Max. +18 -10 Units V V ±4 V ±6.5 V 14 ±1.5 mA A µA -0.1 VOS Output Offset voltage Note 2 SVR Supply voltage rejection Flyback detection threshold (positive slope) Flyback detection threshold (negative slope) Switching frequency Switching frequency operative range Note 3 82 dB V(14) 1.5 V V(14) 0.5 V Flythr Flythf Fsw Fsw - op Rfreq Frequency controller resistor range Rfreq = 10kΩ Pin 10 -50 +50 mV 120 100 140 160 200 kHz kHz 7 10 14 kΩ 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. 5/8 2 STV9381 6 PACKAGE MECHANICAL DATA Dimensions A A1 A2 b b1 b2 c c1 D 6/8 3 Min. 0.381 2.921 0.381 0.356 1.397 0.203 0.203 26.035 Millimeters Typ. 3.302 0.457 0.457 1.524 0.254 0.254 26.162 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. 0.130 0.018 0.018 0.060 0.010 0.010 1.030 Max. 0.210 0.195 0.022 0.020 0.065 0.012 0.011 1.035 Notes 3 3 8 4 STV9381 Dimensions D1 E E1 e eA eB eC L N Q1 Min. 0.762 7.62 6.096 Millimeters Typ. 0.889 6.401 2.54 7.62 0.000 3.175 1.397 20 1.524 Max. 1.016 8.255 6.604 Min. 0.030 0.300 0.240 10.922 1.524 3.429 0.000 0.125 1.651 0.055 Inches Typ. 0.035 0.252 0.100 0.300 Max. 0.040 0.325 0.260 0.430 0.060 0.135 20 0.060 Notes 4 5 4 5 6 6 3 7 0.065 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 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. 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 ÿ2003 STMicroelectronics - All Rights Reserved. 2 Purchase of I C Components by STMicroelectronics conveys a license under the Philips I2C Patent. Rights to use these components in an I2C system is granted provided that the system conforms to the I2C 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 8/8 4