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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 |
| 文件頁數(shù)： | 26/46頁 |
| 文件大?。?/td> | 528K |
| 代理商： | STV202 |
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STV2001
26/
46
Figure 8. Details of VCO
The VCO uses an external RC network. It delivers
a linear sawtooth resulting from the capacitor
charge and discharge . The current is proportional
to the one in the resistor. Typical thresholds for the
sawtooth are 1.6 V and 6.4 V.
The VCO control voltage varies between 3.0 V
and 3.8 V (see
Figure 8
). This VCO frequency
range is very small. The small effective frequency
is due to clamp intervention on the lowest filter val-
ue. The PLL1F filter voltage is set by a 4-bit DAC
with a voltage range of 3.0 to 3.8 V.
The sync frequency must always be higher than
the free running frequency. For example, when us-
ing a 60 kHz synchro range, the suggested free
running frequency is 56 kHz.
PLL1 ensures the coincidence between the lead-
ing edge of the sync signal and a phase reference
resulting from the comparison of:
– the VCO sawtooth
– an internal DC voltage I2C adjustable within the
range of 2.9V to 4.2V (corresponding to ±10%)
(see
Figure 9
).
A Lock/Unlock identification block, also included,
detects in real time whether PLL1 is locked on the
incoming horizontal sync signal or not.
The lock/unlock information is available through
the I
2
C read.
The FC1 Pin (Pin 43) is used for decoupling the in-
ternal 6.4 V reference by a capacitor.
Figure 9. PLL1 Timing Diagram
RS
FLIP FLOP
0
0.875T
H
T
H
C0
42
1.6V
6.4V
4 I
0
I
0
2
(1.4V<V
7
<6.4V)
PLL1F
I
0
41
R0
1.6V
6.4V
Phase REF1 is obtained by comparison between the sawtooth and a DC voltage adjustable between 2.9 V and 4.2 V.
H O
Sawtooth
7/8 TH
1/8 TH
6.4V
3.4V (Reference for H Position)
Vb
(2.8V<Vb<4.2V)
1.6V
Phase REF1
HSynchro
The PLL1 ensures the exact coincidence between the signal phase REF and HSYNC.
A ±10% T
H
phase adjustment is possible around the 3.5V point.
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