DATA SHEET
Product specification
File under Integrated Circuits, IC02
March 1991
INTEGRATED CIRCUITS
TDA3654
TDA3654Q
Vertical deflection and guard circuit
(110)
March 1991
2
Philips Semiconductors
Product specification
Vertical deflection and guard circuit
(110)
TDA3654
TDA3654Q
GENERAL DESCRIPTION
The TDA3654 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
THERMAL RESISTANCE
PACKAGE OUTLINES
Notes
1. SOT131-2; 1997 January 07
2. SOT157-2; 1997 January 07
Output voltage
V
5-2
max.
60
V
Output current (peak-to-peak)
I
5(p-p)
max.
3
A
Supply voltage
V
9-2
max.
40
V
Guard circuit output voltage
V
7-2
max.
5,6
V
Operating ambient temperature range
T
amb
-
25 to
+
60
C
Storage temperature
T
stg
-
55 to
+
150
C
From junction to mounting base
R
th j-mb
3,5 to 4
K/W
TDA3654
: 9-lead SIL; plastic power (SOT131)
(1)
.
TDA3654Q
: 9-lead SIL bent to DIL; plastic power (SOT157)
(2)
.
March 1991
3
Philips Semiconductors
Product specification
Vertical deflection and guard circuit (110)
TDA3654
TDA3654Q
Fig.1 Block diagram.
March 1991
4
Philips Semiconductors
Product specification
Vertical deflection and guard circuit (110)
TDA3654
TDA3654Q
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 V
CEO
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, this is illustrated in Fig.5 where
typical SOAR curves of the lower output transistor are given. 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.
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 Fig.1).
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.
March 1991
5
Philips Semiconductors
Product specification
Vertical deflection and guard circuit (110)
TDA3654
TDA3654Q
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134).
Pins 2 and 4 are externally connected to ground.
Voltages
Output voltage
V
5-4
0 to 60
V
Supply voltage
V
9-4
0 to 40
V
Supply voltage output stage
V
6-4
0 to 60
V
Input voltage
V
1-2
0 to V
9-4
V
Input voltage switching circuit
V
3-2
0 to V
9-4
V
External voltage at pin 7
V
7-2
0 to 5,6
V
Currents
Repetitive peak output current
I
5RM
max.
1,5
A
Non-repetitive peak output current (note 1)
I
5SM
max.
3
A
Repetitive peak output current of flyback generator
I
8RM
max.
+
1,5
A
-
1,6
A
Non-repetitive peak output current of flyback generator (note 1)
I
8SM
max.
3
A
Temperatures
Storage temperature range
T
stg
-
65 to
+
150
C
Operating ambient temperature range (see Fig.3)
T
amb
-
25 to
+
60
C
Operating junction temperature range
T
j
-
25 to
+
150
C
(the output current at pin 5 should not exceed 2.5A)
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