STV9390 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 2.2 APP SUITABLE FOR DC COUPLING APPLICATION FEW EXTERNAL COMPONENTS PROTECTION AGAINST LOW Vcc SO20 ORDER CODE: STV9390 DESCRIPTION Designed for monitors and TVs, the STV9390 is a class-D vertical deflection booster assembled in SO20 Package. It operates with supplies up to +/- 18V, provides up to 2.2 App output current to drive the yoke. The internal flyback generator avoids the need for an extra power supply. PIN CONNECTION +VCC 1 20 EAOUT +VCC POW 2 19 IN+ -VCC POW 3 18 IN- NC 4 17 SGND -VCC 5 16 -VCC 6 15 -VCC NC 7 14 FREQ OUT 8 13 FEEDCAP CFLY+ 9 12 CFLY- 10 11 VREG BOOT -VCC Version 2.0 September 2003 1/7 1 STV9390 1 PIN FUNCTIONS Pin Number Name 1 +VCC 2 +VCCPOW Positive power supply 3 -VCCPOW Negative power supply 2 Function Positive supply 4 NC 5 -VCC Not connected Negative supply 6 -VCC Negative supply 7 NC 8 OUT 9 CFLY+ Flyback capacitor 10 CFLY- Flyback capacitor Not connected PWM output 11 BOOT Bootstrap capacitor 12 VREG Internal voltage regulator 13 FEEDCAP 14 FREQ Frequency setting resistor 15 -VCC Negative supply 16 -VCC Negative supply 17 SGND Signal ground Feed-back integrating capacitor 18 IN- Error amplifier inverting input 19 IN+ Error amplifier non-inverting input 20 EAOUT Error amplifier output FUNCTIONAL DESCRIPTION The STV9390 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. 2/7 2 Figure 1. Test and Application Circuit +VCC 100nF 1000µF 100nF 1 -VCC +VCC 2 +VCCPOW STV9390 STV9390 VREG -VCC 12 Flyback detection Vref 100nF Flyback generator CFLY+ 9 10 CFLYBACK 100µF CFLYBOOT IN+ 19 1kΩ IN - Output drive Modulator _ 18 Input signal Cboot 220nF 11 + OUT 8 EAOUT 1mH 150Ω 470nF 20 10kΩ 1kΩ 150Ω Deflect. Yoke* 200Ω Pins 5,6,15,16 13 17 SGND 14 FEEDCAP 470pF 4.7nF 560pF 3 FREQ 10kΩ -VCC -VCCPOW 100nF 1000µF Sense resistor 0.5Ω -VCC 2 3/7 fvert = 50Hz STV9390 * Deflection yoke characteristics: R = 5.5Ω, L = 7mH STV9390 3 ABSOLUTE MAXIMUM RATINGS Symbol VCC Tstg, Tj Top DC Supply Voltage Storage and Junction Temperature Operating Temperature Range VESD ESD Susceptibility - Human Body Model (100 pF discharge through 1.5 kΩ) Iout Output current Vout Maximum output voltage (pin 8) with respect to -Vcc (pins 5, 6, 15, 16) and during flyback (see Note 1) Note: 1 4 Parameter Value ±20 V -40 to +150 °C 0 to +70 °C ±2 kV ±1.6 A 80 V During the flyback with Vcc=±18V, the maximum output voltage (pin 8) is close to 72V, with respect to -Vcc (pins 5, 6, 15, 16). THERMAL DATA Symbol Parameter Rth j-amb Thermal resistance Junction to ambient Value Unit 78 °C/W Pins 5, 6, 15, 16 are internally connected together and participate to heat evacuation. 4/7 2 Unit STV9390 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 Typ. Max. +18 -10 Units V V ±4 V ±6.5 V 14 ±1.1 mA A Input voltage = 0 Note 2 Amplifier Input bias current µA -0.1 VOS Output Offset voltage Note 3 SVR Supply voltage rejection Flyback detection threshold (positive slope) Flyback detection threshold (negative slope) Integrated circuit Dissipated power Switching frequency Switching frequency operative range Note 4 82 dB V(20) 1.5 V V(20) 0.5 V Note 5 0.9 W Flythr Flythf Pd Fsw Fsw - op Rfreq Frequency controller resistor range -50 Rfreq = 10kΩ +50 mV 120 100 140 160 200 kHz kHz 7 10 14 kΩ Pin 14 Note: 2 The maximum vertical yoke current is dependent on ±VCC. The maximum current as function of ±VCC is given in Table 1 Note: 3 Input voltage = 0, measured after the filter (e.g. accross the 470 nF filter capacitor) Note: 4 Supply rejection of the positive or negative power supply. Vcc ripple =1Vpp, f=100Hz, measured on the sense resistor. Note: 5 Power dissipated in the circuit in the case of the application from Figure 1 and the current in the deflection yoke adjusted to 2.2App. The corresponding power dissipated in the vertical deflection yoke is 2.25W. Table 1. Maximum yoke current as function of ±VCC Symbol Unit ±VCC ±10 to 14 ±15 ±16 ±17 ±18 V Iy ±1.1 ±1.05 ±1.0 ±0.95 ±0.85 A 5/7 2 STV9390 6 PACKAGE MECHANICAL DATA A A1 B C D E e H h L K 6/7 3 Min. 2.35 0.10 0.33 0.23 12.6 7.40 Millimeters Typ. Max. 2.65 0.30 0.51 0.32 13.00 7.60 Min. 0.96 0.004 0.015 0.009 0.504 0.296 10.65 0.75 1.27 8° 0.400 0.01 0.016 1.27 10.00 0.25 0.40 0° Inches Typ. Max. 0.100 0.012 0.019 0.013 0.52 0.304 0.051 0.426 0.03 0.051 STV9390 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. Purchase of I2C 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. 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