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參數(shù)資料
| 型號(hào)： | STV202 |
| 英文描述： | TV Power Schematic |
| 中文描述： | 電視電源原理圖 |
| 文件頁(yè)數(shù)： | 29/46頁(yè) |
| 文件大?。?/td> | 528K |
| 代理商： | STV202 |
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STV2001
29/
46
The gain of this stage can be adjusted (
±
25%) de-
pending on its register value.
The mean value of this ramp is driven by its own
I
2
C register (vertical position) with :
VPOS = 7/16 x
V
REF-V
=
±
300 mV.
Usually V
OUT
is sent through a resistive divider to
the inverting input of the booster. Since VPOS de-
rives from V
REF-V
,
the bias voltage sent to the non-
inverting input of the booster should also derive
from V
REF-V
to optimize the accuracy
(see
Figure 14
).
Figure 14. AGC Loop Block Diagram
14.3.3 - Basic Equations
As a first approximation, the amplitude of the ramp
on Pin 7 (VOUT) is calculated as follows:
V
OUT
- VPOS = (V
OSC
- V
DCMID
) x
(1 + 0.25 (V
AMP
))
where :
V
DCMID
= 7/16 x V
REF
(middle value of the ramp on
Pin 5, typically 3.6V)
V
OSC
= V
5
(ramp with fixed amplitude)
V
AMP
= -1 as minimum vertical amplitude register
value and +1 as maximum value.
VPOS is calculated according to:
VPOS = V
DCMID
+ (0.4x V
P
)
where V
P
= -1 and +1 as respectively minimum
and maximum vertical position register value.
The current available on Pin 6 is:
I
OSC
=
where
C
OSC
= capacitor connected on Pin 6
f = synchronization frequency.
x V
REF
x C
OSC
x
f
14.3.4 - Geometric Corrections
The principle is represented in
Figure 15
.
Starting from the vertical ramp, a parabola-shaped
current is generated for E/W correction (also
known as Pin Cushion correction), dynamic hori-
zontal phase control correction.
The parabola generator consists of an analog mul-
tiplier, the output current of which is equal to :
I = k x
(
V
OUT
-
V
DCMID
)
2
where V
OUT
is the vertical output ramp (typically
between 2 and 5 V) and V
DCMID
is 3.6 V
(for V
REF-V
= 8.2V). The VOUT sawtooth is typical-
ly centered on 3.6 V. By changing the vertical po-
sition, the sawtooth shifts by
±
0.4 V.
The "geometry tracking" feature ensures a correct
screen geometry for any end user adjustment. It
generates non-symmetric parabola dependent on
the vertical position. To avoid Vertical EHT com-
pensation (VBreathing) from affecting the geome-
try correction, an additional Buffer Amplifier is
used for VBreathing.
4
VSYNCIN
2
SYNCHRO
OSCILLATOR
DISCH.
OSC
CAP
6
CHARGE CURRENT
TRANSCONDUCTANCE
AMPLIFIER
SAMPLING
CAPACITANCE
S CORRECTION
BREATH
VOUT
VPOSITION
SUB09/7bits
VERT AMP
SUB08/7bits
VS AMP
SUB0A/7bits
SAMPLING
Vlow
Sawth
Disch
.
REF
24
7
I2C
sub14
/6bits
3
8
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