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E-STV9380A-STV9380A
CLASS-D VERTICAL DEFLECTION AMPLIFIER FOR 2.5 AMP TV AND MONITOR APPLICATIONS
STV9380AClass-D Vertical Deflection Amplifier
for 2.5 Amp TV and Monitor Applications
Main Features High-Efficiency Power Amplifier No Heatsink Split Supply Internal Flyback Generator Output Current up to 2.5 APP Suitable for DC Coupling Applications Few External Components Protection against Low VCC
DescriptionDesigned 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 APP to drive the yoke.
The internal flyback generator avoids the need for
an extra power supply.
Pin Functions STV9380A Pin FunctionsNote1. 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.
Functional DescriptionThe 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-RON N-channel DMOS transistors.
Table 1: STV9380A Pin Descriptions
STV9380A Functional Description
Figure 1: Test and Application Circuit Diagram
Absolute Maximum Ratings STV9380A Absolute Maximum RatingsNote1. During the flyback with VCC = ±18 V, the maximum output voltage (pin 4) is close to 72 V, with
respect to -VCC (pins 1, 2, 3, 18, 19 and 20).
Thermal DataPins 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
STV9380A Electrical Characteristics Electrical Characteristics AMB = 25° C, VCC = ±12 V and f VERT = 50 Hz unless otherwise specified (refer to Figure1)
Note1. Input voltage = 0, measured after the filter (e.g. across the 470 nF filter capacitor) Supply rejection of the positive or negative power supply. VCC ripple =1VPP , f =100 Hz, 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 2.5APP . The corresponding power dissipated in the vertical deflection
yoke is 2.8 W.
I/O Waveforms STV9380A I/O WaveformsThe following waveforms are obtained with the schematic diagram given in Figure1: Test and
Application Circuit Diagram.
Figure 3: Current in the Deflection Yoke (Calibration: 0.5 A/div.)
