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STV9325
Vertical Deflection Booster for 2.5-APPTV/Monitor Applications with 70-V Flyback Generator
DATASHEET
STV9325 ertical Deflection Booster
for 2.5-A PP TV/Monitor Applications with 70-V Flyback Generator
Main Features Power Amplifier Flyback Generator Stand-by Control Output Current up to 2.5 App Thermal Protection
DescriptionThe STV9325 is a vertical deflection booster
designed for TV and monitor applications.
This device, supplied with up to 35 V, provides up to
2.5 App output current to drive the vertical
deflection yoke.
The internal flyback generator delivers flyback
voltages up to 75V.
In double-supply applications, a stand-by state will
be reached by stopping the (+) supply alone.
Absolute Maximum Ratings STV9325 Absolute Maximum Ratings Note:1. Usually the flyback voltage is slightly more than 2 x VS. This must be taken into consideration when
setting VS. Versus pin 4 V3 is higher than VS during the first half of the flyback pulse. Such repetitive output peak currents are usually observed just before and after the flyback pulse. This non-repetitive output peak current can be observed, for example, during the Switch-On/Switch-
Off phases. This peak current is acceptable providing the SOA is respected (Figure 8 and Figure 9). All pins have a reverse diode towards pin 4, these diodes should never be forward-biased. Input voltages must not exceed the lower value of either VS + 2 or 40 volts.
2Thermal Data
STV9325 Electrical Characteristics Electrical CharacteristicsS = 34 V, T AMB = 25°C, unless otherwise specified) In normal applications, the peak flyback voltage is slightly greater than 2 x (VS - V4). Therefore, (VS
- V4 ) = 35 V is not allowed without special circuitry. Refer to Figure 4, Stand-by condition.
Electrical Characteristics STV9325
Figure 1: Measurement of I1, I2 and I6
Figure 2: Measurement of V5H
Figure 3: Measurement of V3L and V5L
STV9325 Application Hints Application HintsThe yoke can be coupled either in AC or DC.
4.1 DC-coupled ApplicationWhen DC coupled (see Figure 4), the display vertical position can be adjusted with input bias. On
the other hand, 2 supply sources (VS and -VEE) are required.
A Stand-by state will be reached by switching OFF the positive supply alone. In this state, where
both inputs are the same voltage as pin 2 or higher, the output will sink negligible current from the
deviation coil.
4.1.1 Application HintsFor calculations, treat the IC as an op-amp, where the feedback loop maintains V1 = V7.
Figure 4: DC-coupled Application
Application Hints STV9325
4.1.1.1 Centering Display will be centered (null mean current in yoke) when voltage on pin 7 is (R1 is negligible):
4.1.1.2 Peak CurrentExample: for Vm =2 V, VM =5 V and IP =1A
Choose R1 in the1 Ω range, for instance R1=1Ω
From equation of peak current:
Then choose R2 or R3 . For instance, if R2 = 10 kΩ, then R3 = 15 kΩ
Finally, the bias voltage on pin 7 should be:
4.1.2 Ripple RejectionWhen both ramp signal and bias are provided by the same driver IC, you can gain natural rejection
of any ripple caused by a voltage drop in the ground (see Figure 5), if you manage to apply the
same fraction of ripple voltage to both booster inputs. For that purpose, arrange an intermediate
point in the bias resistor bridge, such that (R8 / R7) = (R3 / R2), and connect the bias filtering
capacitor between the intermediate point and the local driver ground. Of course, R7 should be
connected to the booster reference point, which is the ground side of R1.
Figure 5: Ripple Rejection7M Vm+------------------------22 R3+----------------------⎝⎠⎜⎟⎛⎞×=PM Vm– ()-----------------------------21xR3
-------------------×=23
-------P R1××M Vm–----------------------------- 2---==7M Vm+------------------------ 132
-------+
---- -------------× 7---- 1
2.5--------× 1.4V===
STV9325 Application Hints
4.2 AC-Coupled ApplicationsIn AC-coupled applications (See Figure 6), only one supply (VS ) is needed. The vertical position of
the scanning cannot be adjusted with input bias (for that purpose, usually some current is injected
or sunk with a resistor in the low side of the yoke).
4.2.1 Application HintsGain is defined as in the previous case:
Choose R1 then either R2 or R3. For good output centering, V7 must fulfill the following equation:
Figure 6: AC-coupled ApplicationpM Vm–------------------------21 R3×----------------------×=73
-------⎝⎛ 12
-------+× 14 R5+----------------------⎠⎞ VS4 R5+ ()------------------------------M Vm+3×------------------------+ ⎝⎠⎜⎟⎛⎞=+
