TDA1675, Elektronika, elementy
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TDA1675A
.
SYNCHRONISATION CIRCUIT
VERTICAL DEFLECTION CIRCUIT
.
PRECISION OSCILLATOR AND RAMP
GENERATOR
.
POWER OUTPUT AMPLIFIER WITH HIGH
CURRENT CAPABILITY
.
FLYBACK GENERATOR
.
VOLTAGE REGULATOR
.
PRECISION BLANKING PULSE GENERATOR
.
THERMAL SHUT DOWN PROTECTION
.
CRT SCREEN PROTECTION CIRCUIT
WHICH BLANKS THE BEAM CURRENT IN
THE EVENT OF LOSS OF VERTICAL DE-
FLECTION CURRENT
MULTIWATT 15
(Plastic Package)
DESCRIPTION
The TDA1675A is a monolithic integrated circuit in
15-lead Multiwatt
®
package. It is a full performance
and very efficient vertical deflection circuit intended
for direct drive of the yoke of 110
o
colour TV picture
tubes. It offers a wide range of applications also in
portable CTVs, B&W TVs, monitors and displays.
ORDER CODE :
TDA1675A
PIN CONNECTIONS
(top view)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
FLYBACK
SUPPLY
BLANKING OUTPUT
AMPLIFIER INPUT (-)
AMPLIFIER INPUT (+)
RAMP OUTPUT
RAMP GENERATOR
GROUND
HEIGHT ADJUSTMENT
OSCILLATOR
SYNC. INPUT
OSCILLATOR
OSCILLATOR
AMPLIFIER SUPPLY
AMPLIFIER OUTPUT
Tab connected to Pin 8
September 1993
1/11
.
ESD PROTECTED
TDA1675A
BLOCK DIAGRAM
+
+V
S
BLANKING
OUT
13
14
2
+
C
f
BLANK
GENERATOR
AND CRT
PROTECTION
VOLTAGE
REGULATOR
FLYBACK
GENERATOR
15
6
11
R
o
R3
+
RAMP
GENERATOR
4
OSCILLATOR
CLOCK
PULSE
POWER
AMP.
1
Ly
Ry
Iy
C
o
-
3
R1
R2
12
R
e
7
SYNC.
BUFFER
STAGE
THERMAL
PROTECTION
R
a
SYNC.
7
9
10
8
R
c
+
R
b
+
C
c
C
a
LIN
HEIGHT
R
d
C
b
R
f
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Supply Voltage at Pin 14
35
V
V
1
, V
2
Flyback Peak Voltage
65
V
V
5
Sync. Input Voltage
20
V
V
11
, V
12
Power Amplifier Input Voltage
V
S
- 10
V
V
13
Voltage at Pin 13
V
S
I
O
Output Current (non repetitive) at t = 2ms
3
A
I
O
Output Peak Current at f = 50Hz t > 10
m
s
2
A
I
O
Output Peak Current at f = 50Hz t
£
10
m
s
3.5
A
I
15
Pin 15 Peak-to-peak Flyback Current at f = 50Hz, tfly
£
1.5ms
3
A
I
15
Pin 15 D.C. Current at V1 < V
14
100
mA
P
tot
Maximum Power Dissipation at T
case
£
60
o
C
30
W
T
stg
, T
j
Storage and Junction Temperature
- 40, + 150
o
C
THERMAL DATA
Symbol
Parameter
Value
Unit
R
TH(j-c)
Thermal Resistance Junction-case
Max.
3
o
C/W
R
TH(j-a)
Thermal Resistance Junction-ambient
Max.
40
o
C/W
2/11
TDA1675A
DC ELECTRICAL CHARACTERISTICS
(V
S
= 35V, T
amb
= 25
o
C, unless otherwise specified)
Symbol
Parameter
Test conditions
Min. Typ. Max. Unit Fig.
I
2
Pin 2 quiescent current
I
1
= 0
16
36
mA
1b
- I
9
Ramp generator bias current
V
9
= 0
0.02
1
m
Ab
- I
9
Ramp generator current
V
9
= 0 ; - I
7
= 20
m
A
18.5
20
21.5
m
Ab
ê
D
I
9
ê
Ramp generator non linearity
D
V
9
= 0 to 15V, - I
7
= 20
m
A
0.2
1
%
1b
I
9
I
14
Pin 14 quiescent current
25
45
mA
1b
V
1
Quiescent output voltage
V
S
= 35V, R
a
= 2.2k
W
, R
b
= 1k
W
16.4
6.9
17.8
7.5
19.5
8.1
V
V
1a
V
S
= 15V, R
a
= 390
W
, R
b
= 1k
W
V
1L
Output saturation voltage to ground I
1
= 1.2A,
1
1.4
V
1c
V
1H
Output saturation voltage to supply - I
1
= 1.2A
1.6
2.2
V
1d
V
4
Oscillator virtual ground
0.45
V
1b
V
7
Regulated voltage at pin 7
- I
7
= 20
m
A
6.3
6.6
7
V
1b
V
7
D
Regulated voltage drift with supply
voltage
D
V
S
= 15 to 35V
1
2
mV
V
1b
V
S
V
11
Amplifier input (+) reference voltage
4.1
4.4
4.7
V
1b
V
13
Blanking output saturation voltage
I
13
= 10 mA
0.35 0.5
V
1a
V
15
Pin 15 saturation voltage to ground I
15
= 20 mA
1
1.5
V
1a
Figure 1 :
DC Test Circuit.
Figure 1a
Figure 1b
I
15
V
15
V
S
V
S
V
11
I
2
+ I
1
I
14
V
13
I
13
A
11
2
14
B
1V
4
I
1
13
2
14
15
V
4
1
3
7
1
8V
75k
W
R
a
12
5
4
V
1
10
7
9
8
12
1V
-I
9
9
5
11
8
10
R
b
V
7
-I
7
V
-I
9
9
0.1µF
Figure 1c
Figure 1d
V
S
V
S
2
14
2
14
+I
1
V
1H
4
1
4
1
1V
V
1L
1V
-I
1
12
11
5
10
8
12
11
5
10
8
8V
0.1µF
8V
0.1µF
3/11
D
4
TDA1675A
AC ELECTRICAL CHARACTERISTICS
(Refer to A.C. test circuit of fig. 2, T
amb
= 25
o
C, V
S
= 24V, f = 50Hz, unless otherwise specified)
Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
I
S
Supply Current
I
Y
= 2A
PP
295
mA
I
5
Sync Input Current Required to Sync
100
m
A
V
1
Flyback Voltage
I
y
= 2App
50
V
V
3
Peak-to-peak Oscillator Sawtooth
Voltage
I
5
= 0
I
5
= 100
m
A
3.6
3.4
V
V
V
10TH(L)
Start Scan Level of the Input Ramp
1.85
V
t
FLY
Flyback Time
Iy = 2App
0.6
ms
t
BLANK
Blanking Pulse Duration
f
o
= 50Hz, T
j
= 75
o
C
f
o
= 60Hz, T
j
= 75
o
C
1.33 1.4
1.17
1.47 ms
ms
f
o
Free Running Frequency
R
o
= 7.5k
W
, C
o
= 330nF, T
j
= 75
o
C
42
43.5
52.5
46
Hz
Hz
R
o
= 6.2k
W
D
f
Synchronization Range
I
5
= 100
m
A, T
j
= 75
o
C
14
16
Hz
T
j
Junction Temperature for Thermal
Shut-down
145
o
C
V
ON
Peak-to-peak Output Noise
35 mV
PP
Figure 2 :
AC Test Circuit
1N4001
220µF
+V
S
t
f
I
y
t
b
lank
2.4k
W
BLANKING
OUT
V
1
GND
13
14
2
15
1/fo
100µA
SYNC. IN
5
1
t
sync.
6
YOKE
10mH
TDA 1675A
0.22µF
I
Y
A
S1 (R )
o
2.4k
W
W
(FREQ.)
B
4
12
C
o
3
7
9
11
10
8
t
blank
0.1µF
2200µF
1/fo
0
.1µF
47µF
V
3
R
f
I
y
56k
W
100k
W
1/fo
SERVICE
SWITCH
R
f
1/f
o
S2
220k
W
0.1µF
LINEARITY
V
10
V
10thL
GND
HEIGHT
4/11
, C
o
= 330nF, T
j
= 75
o
C
4.7k
TDA1675A
Figure 3 :
Application Circuit for Small Scree 90
o
CTV Set (R
y
= 15
W
; L
y
= 30 mH ; I
y
= 0.82 A
PP
)
1N4001
220µF - 35V
+V
S
C2
35V
470µF
D1
C4
R3
10k
W
C3
0.1µF
BLANKING
OUT
13
14
2
15
0.1µF
YOKE
SYNC.
PULSE
IN
5
1
C1
R9
2.2
R1
4.7k
W
W
6
TDA 1675A
R11
330
R
o
C7
0.22µF
W
7.5k
W
1%
2.4k
W
4
12
*
330nF
5%
R10
2%
C
o
3
7
9
11
10
8
R8
120
W
R7
910
W
2%
1000µF
25V
C9
0.1µF
*
47µF
10V
C8
C
5 0
.1µF
R2
15k
R4
150k
*
W
W
R5
390k
56k
W
RT2
LINEARITY
W
SERVICE
SWITCH
*
R6
100k
W
5%
R12
2.2
W
S1
C6
0.1µF
RT1
HEIGHT
100k
W
* The value depends on the characteristics of the CRT. The value shown is indicative only.
TYPICAL PERFORMANCE
Symbol
Parameter
Value
Unit
V
S
Minimum supply voltage
25
V
I
S
Supply current
140
mA
t
FLY
Flyback time
0.7
ms
t
BLKG
Banking time
1.4
ms
f
O
Free running frequency
43.5
Hz
* P
TOT
Power dissipation
2.4
W
* R
TH(heatsink)
Thermal resistance of the heatsink
for T
amb
= 60
o
C and T
j max
= 110
o
C
for T
amb
= 60
o
C and T
j max
= 120
o
C
13
16
o
C/W
o
C/W
* Worst case condition.
5/11
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