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TDA4950 Datasheet(PDF) 3 Page - STMicroelectronics

Part No. TDA4950
Description  TV EAST/WEST CORRECTION CIRCUIT
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ELECTRICAL CHARACTERISTICS (Tamb = 25
oC, VS = 26 V, Vfr = 0, S1 and S2 in "a" position,
refer to test circuit unless otherwise specified) (continued)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
K1
Parabola Coefficient
K1
=
V7A
− V7B
V7A
− V7C
, see Figure 2
0.28
K2
Parabola Coefficient
K2
=
V7A
− V7C
V7A
− V7D
, see Figure 2
0.71
∆V7 (*)
∆V7 = V7E – V7F, see Figure 2
– 40
40
mV
I8
Current Source
S1
→ b
100
µA
VSATL
Saturation Voltage
Io = 400 mA Sink
S2
→ b1
2
V
VSATH
Saturation Voltage
Io = 100 mA Source
S2
→ cS1 → b
0.8
1.5
V
VF
Forward Voltage
Io = 400 mA
S2
→ dS1 → b
1.2
1.7
V
Ifr
Frame Sawtooth Current
Vfr = 6.6 VPP
66
µA
7
R7
R6
10k
10k
R2
R8
20k
a
b
S1
R3
11k
10k
R1
S2
a
b
c
d
TDA4950
V
S
V
F
V
SATH
I
O
V
SATL
I
F
-I
O
I
FR
V
REF
V
FR
6
5
8
4
3
1
2
Figure 1 : Test CIrcuit
-60
0
15
30
36
60
V
7F
V
7A
V
7B
V
7C
V
7D
V
7E
V
7 (V)
I
FR (µA)
Figure 2 : Parabola Characteristics
CIRCUIT OPERATION
(see the shematic diagram)
A differential amplifier OP1 is driven by a vertical
frequency sawtooth current of
± 33µA which is
produced via an external resistor from the sawtooth
voltage. The non-inverting input of this amplifier is
connected with a reference voltage corresponding
to the DC level of the sawtooth voltage. This DC
voltage should be adjustable for the keystone cor-
rection. The rectified output current of this amplifier
drives the parabola network which provides a para-
bolic output current. This output current produces
the corresponding voltage due to the voltage drop
across the external resistor at pin 7.
If the input is overmodulated (> 40
µA) the internal
current is limited to 40
µA. This limitation can be
used for suppressing the parasitic parabolic current
generated during the flyback time of the frame
sawtooth.
A comparator OP2 is driven by the parabolic cur-
rent. The second input of the comparator is con-
nected with a horizontal frequency sawtooth
voltage the DC level of which can be changed by
the external circuitry for the adjustment of the pic-
ture width.
The horizontal frequency pulse-width modulated
output signal drives the final stage. It consists of a
class D push-pull output amplifier that drives, via
an external inductor, the diode modulator.
TDA4950
3/5




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