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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)： | 35/46頁 |
| 文件大?。?/td> | 528K |
| 代理商： | STV202 |
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STV2001
35/
46
Figure 20. Waveforms (DRIVE adjustment)
14.4.7 - Bright Window
Contrast Gain can be increased by 1.5X when the
I2C command “GainWin” is issued or GWIN (Pin
16) pulse value reaches its Turn-ON threshold.
Bright Window gain can be controlled separately
by I
2
C command or pulse voltage at “GAINWIN”
pin. Although both controls are independent, max
gain is still limited to 1.5x, not 1.5x + 1.5x.
14.4.8 - Blanking Generator
A vertical blanking pulse is generated
(see
Figure 21
). The output level is a positive go-
ing pulse of 9.5V. The vertical blanking is started
by the vertical sync pulse and by the falling edge of
VFly pulse. If there is no VFly pulse (VFly>6.5V),
the vertical blanking the vertical blanking start co-
incides with the beginning of the vertical capacitor
discharge time.
The blanking output generates a superimposed
variable DC voltage. The 6-bit adjustment range is
1 V to 4.5 V. This is used to allow brightness con-
trol through G1. Additionally, this pin is used for
spot killer suppression. The
0.8 V
of Vcc threshold
will trigger the output into a high level state result-
ing from the Vcc decay.
Figure 21. VBDC (Pin 18) Output Voltage Waveform
HSYNC
V
CONT
BPCP
HFly
Video IN
V
BRT
V
BLACK
V
DC
V
OUT1
V
OUT2
,
V
OUT3
,
two examples of
drive adjustment
(1)
Note :
1. Drive adjustment modifies the following voltages : V
CONT
, V
BRT
.
Drive adjustment does not modify the following voltages : V
DC
and V
BLACK
.
DC level controlled by
6-bit DAC
9.5V
4.5 V
1.0 V
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