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KODENSHI KOREA

KKA3654 Datasheet Preview

KKA3654 Datasheet

VERTICAL DEFLECTION AND GUARD CIRCUIT

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TECHNICAL DATA
VERTICAL DEFLECTION AND GUARD CIRCUIT (110°)
The KKA3654 is a full performance vertical deflection output circuit for direct drive of the deflection
coils and can be used for a wide range of 90 and 110 deflection systems.
A guard circuit is provided which blanks the picture tube screen in the absence of deflection
current.
FEATURES
Direct drive to the deflection coils
90 and 110 deflection system
Internal blanking guard circuit
Internal voltage stabilizer
QUICK REFERENCE DATA
PARAMETER
Output voltage
Output current (peak-to-peak)
Supply voltage
Guard circuit output voltage
Operating ambient temperature range
Storage temperature
THERMAL RESISTANCE
From junction to mounting base
SYMBOL
V5-2
I5(p-p)
V9-2
V7-2
Tamb
Tstg
Rth j-mb
MIN.
25
55
3,5
MAX.
60
3
40
5,6
60
150
4
UNIT
V
A
V
V
oC
oC
K/W
BLOCK DIAGRAM.
FUNCTIONAL DESCRIPTION
Output stage and protection circuits
The output stage consists of two Darlington configurations in class B arrangement. Each output
transistor can deliver 1,5 A maximum and the VCEO is 60 V.
Protection of the output stage is such that the operation of the transistors remains well within the
SOAR area in all circumstances at the output pin, (pin 5). This is obtained by the cooperation of
the thermal protection circuit, the current-voltage detector and the short circuit protection.
Special measures in the internal circuit layout give the output transistors extra solidity. The same
curves also apply for the upper output device. The supply for the output stage is fed to pin 6 and
the output stage ground is connected to pin 4.
1




KODENSHI KOREA

KKA3654 Datasheet Preview

KKA3654 Datasheet

VERTICAL DEFLECTION AND GUARD CIRCUIT

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KKA3654
Driver and switching circuit
Pin 1 is the input for the driver of the output stage. The signal at pin 1 is also applied to pin 3 which
is the input of a switching circuit (pin 1 and 3 are connected via external resistors).
This switching circuit rapidly turns off the lower output stage when the flyback starts and it,
therefore, allows a quick start of the flyback generator. The maximum required input signal for the
maximum output current peak-to-peak value of 3 A is only 3 V, the sum of the currents in pins 1
and 3 is then maximum 1 mA.
Flyback generator
During scan, the capacitor between pins 6 and 8 is charged to a level which is dependent on the
value of the resistor at pin 8 (see Block diagram ).
When the flyback starts and the voltage at the output pin (pin 5) exceeds the supply voltage, the
flyback generator is activated.
The supply voltage is then connected in series, via pin 8, with the voltage across the capacitor
during the flyback period. This implies that during scan the supply voltage can be reduced to the
required scan voltage plus saturation voltage of the output transistors. The amplitude of the flyback
voltage can be chosen by changing the value of the external resistor at pin 8. It should be noted
that the application is chosen such that the lowest voltage at pin 8 is > 1,5 V, during normal
operation.
Guard circuit
When there is no deflection current, for any reason, the voltage at pin 8 becomes less than 1 V,
the guard circuit will produce a d.c. voltage at pin 7. This voltage can be used to blank the picture
tube, so that the screen will not burn in.
Voltage stabilizer
The internal voltage stabilizer provides a stabilized supply of 6 V to drive the output stage, so the
drive current is not affected by supply voltage variations.
RATINGS
Pins 2 and 4 are externally connected to ground.
PARAMETER
SYMBOL
Voltages
Output voltage
Supply voltage
Supply voltage output stage
Input voltage
Input voltage switching circuit
External voltage at pin 7
Currents
Repetitive peak output current
Non-repetitive peak output current (note 1)
Repetitive peak output current of flyback generator
V5-4
V9-4
V6-4
V1-2
V3-2
V7-2
+I5RM
+I5SM
I8RM
Non-repetitive peak output current of flyback
generator (note 1)
Temperatures
Storage temperature range
Operating ambient temperature range
Operating junction temperature range
(the output current at pin 5 should not exceed 2.5A)
+I8SM
Tstg
Tamb
Tj
MIN.
0
0
0
0
0
0
65
25
25
MAX.
60
40
60
V9-4
V9-4
5,6
1,5
3
1,5
1,6
3
150
60
150
UNIT
V
V
V
V
V
V
A
A
A
A
A
oC
oC
oC
2


Part Number KKA3654
Description VERTICAL DEFLECTION AND GUARD CIRCUIT
Maker KODENSHI KOREA
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