TDA1675.pdf

(237 KB) Pobierz
VERTICAL DEFLECTION CIRCUIT
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

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin