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STV9390
CLASS-D VERTICAL DEFLECTION AMPLIFIER FOR TV AND MONITOR APPLICATION
FEATURES
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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
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.
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SO20 ORDER CODE: STV9390
PIN CONNECTION
+VCC
1 2 3 4 5 6 7 8 9
20 19 18 17 16 15 14 13 12
EAOUT IN+ IN-
+VCC POW -VCC POW
NC
SGND
-VCC -VCC NC
-VCC
-VCC FREQ FEEDCAP VREG BOOT
OUT
CFLY+ CFLY-
September 2003
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Version 2.0
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STV9390
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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 +VCCPOW -VCCPOW NC -VCC -VCC NC OUT CFLY+ CFLYBOOT VREG FEEDCAP FREQ -VCC -VCC SGND ININ+ EAOUT Positive supply Positive power supply Negative power supply Not connected Negative supply Negative supply Not connected PWM output Flyback capacitor Flyback capacitor Bootstrap capacitor Internal voltage regulator Feed-back integrating capacitor Frequency setting resistor Negative supply Negative supply Signal ground Error amplifier inverting input Error amplifier non-inverting input Error amplifier output Function
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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.
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Figure 1. Test and Application Circuit
+VCC
100nF
100nF +VCC -VCC
1000F
1
2
+VCCPOW STV9390 STV9390
VREG -VCC 100nF 12 Vref Flyback detection Flyback generator 9 10 CFLY+ CFLYBACK 100F
CFLYBOOT
IN+ 19 1k Input signal IN 18 EAOUT 20 10k 1k 17 SGND FEEDCAP 470pF 4.7nF 13 14 FREQ 10k -VCC 100nF Pins 5,6,15,16 3 + _ Modulator Output drive
11 OUT 8 150
Cboot 220nF 1mH 470nF 150 Deflect. Yoke* 200
560pF -VCCPOW 1000F Sense resistor 0.5
-VCC
STV9390
* Deflection yoke characteristics: R = 5.5, L = 7mH fvert = 50Hz 3/7
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STV9390
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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 k) Output current Maximum output voltage (pin 8) with respect to -Vcc (pins 5, 6, 15, 16) and during flyback (see Note 1) Parameter Value 20 -40 to +150 0 to +70 2 1.6 80 Unit V C C kV A V
Note: 1
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).
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THERMAL DATA
Symbol Rth j-amb Parameter Thermal resistance Junction to ambient Value 78 Unit C/W
Pins 5, 6, 15, 16 are internally connected together and participate to heat evacuation.
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STV9390
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ELECTRICAL CHARACTERISTICS (refer to Figure 1 on page 3)
Tamb = 25C unless otherwise specified, Vcc = 12V, fvert=50Hz
Symbol +Vcc -Vcc Vcc Vccstart Iq Iy I13, I12 VOS SVR Flythr Flythf Pd 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) Integrated circuit Dissipated power Switching frequency Switching frequency operative range Frequency controller resistor range Note 3 Note 4 V(20) V(20) Note 5 Rfreq = 10k Pin 14 120 100 7 -50 82 1.5 0.5 0.9 140 10 160 200 14 Input voltage = 0 Note 2 Test Conditions Min. +10 -18 Typ. Max. +18 -10 4 6.5 14 1.1 -0.1 +50 Units V V V V mA A
A
mV dB V V W kHz kHz k
Note: 2 Note: 3 Note: 4 Note: 5
The maximum vertical yoke current is dependent on VCC. The maximum current as function of VCC is given in Table 1 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. 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 VCC Iy 10 to 14 1.1 15 1.05 16 1.0 17 0.95 18 0.85 Unit V A
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STV9390
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PACKAGE MECHANICAL DATA
A A1 B C D E e H h L K
Min. 2.35 0.10 0.33 0.23 12.6 7.40 10.00 0.25 0.40 0
Millimeters Typ.
Max. 2.65 0.30 0.51 0.32 13.00 7.60 10.65 0.75 1.27 8
Min. 0.96 0.004 0.015 0.009 0.504 0.296 0.400 0.01 0.016
Inches Typ.
Max. 0.100 0.012 0.019 0.013 0.52 0.304 0.426 0.03 0.051
1.27
0.051
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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 y2003 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. 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.
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