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參數(shù)資料
| 型號： | STV202 |
| 英文描述： | TV Power Schematic |
| 中文描述： | 電視電源原理圖 |
| 文件頁數(shù)： | 32/46頁 |
| 文件大?。?/td> | 528K |
| 代理商： | STV202 |
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STV2001
32/
46
14.3.5 - E/W
EWOUT = EW
DC
+ K1
(
V
OUT
-
V
DCMID
) +K2
(
V
OUT
-
V
DCMID
)
2
K1 is adjustable via the keystone I
2
C register. K2 is adjustable via the E/W amplitude I
2
C register.
14.3.6 - Dynamic Horizontal Phase Control
I
OUT
= K4 (V
OUT
-
V
DCMID
) + K5 (V
OUT
-
V
DCMID
)
2
K4 is adjustable via the parallelogram I
2
C register.
K5 is adjustable via the side pin balance I
2
C register.
14.3.7 - Vertical Dynamic Focus
Vertical Dynamic Focus waveform is available on
Pin 23. It is the parabolic waveform with down-
wards concavity, at vertical frequency. Its ampli-
tude is fixed at 1 Vpp.
14.3.8 - Corner Correction
There are 4 types of corner correction in the de-
vice: EW Corner Top, EW Corner Bottom, Corner
Phase Top and Corner Phase Bottom. EW Corner
Top and EW Corner Bottom are used to modulate
the EW amplitude. Corner Phase Top and Corner
Phase Bottom are used to modulate the Horizontal
Phase. These 4 types of correction are used to
compensate the distortion appearing at the cor-
ners of the CRT.
EW Corner Top and EW Corner Bottom correc-
tions add a half parabola current to the EW volt-
age. Since the E/W output voltage range is limited,
it was necessary to add EW Corner Correction to
decrease both EW amplitude and Keystone by
I
2
C.
Corner Phase Top and Corner Phase Bottom cor-
rections add a half parabola current to the Hori-
zontal Phase. Top and Bottom Corrections can be
adjusted separately by I
2
C with 7 Bits DAC.
14.3.9 - Horizontal Breathing
Horizontal breathing is performed through the EW
stage with V-I Converter and an I
2
C controlled var-
iable gain stage. This DC controlled input provides
the Horizontal Width correction required to offset
width changes due to EHT variation. Gain attenu-
ation is set by a 7 bits DAC with I
2
C.
14.3.10 - Vertical Breathing
Vertical breathing compensation is performed
through gain modulation of the vertical ramp. This
DC-controlled input allows the vertical height cor-
rections needed to offset height changes due to
EHT variations. Input is received at the output of
the EHT compensation Amplifier. Gain attenuation
is set by 6 Bits DAC via I
2
C.
PRE-AMPLIFIER PART
14.4 - GENERAL CONSIDERATIONS
14.4.1 - Input Stage
The R, G and B signals must be supplied to the
three inputs through coupling capacitors (100nF).
The maximum input peak-to-peak video amplitude
is 1 V.
The input stage includes a clamping function. This
clamp uses the input serial capacitor as "memory
capacitor" and is gated by an internally generated
"Back-Porch-Clamping-Pulse (BPCP)".
The BPCP is synchronized on the second edge of
the horizontal pulse HIN inputs on Pin 1.
Figure 16. .
In both cases, BPCP width is fixed.
HSYNC
BPCP
Internal pulse width is fixed at 1
μ
s
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