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TDA8215B 데이터시트(PDF) 6 Page - STMicroelectronics

부품명 TDA8215B
상세설명  HORIZONTAL AND VERTICAL DEFLECTION CIRCUIT
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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The oscillator thresholds are internally fixed by
resistors. The discharge of the capacitor depends
on the internal resistor R4. The control voltage is
applied on resistor R5.
11
Phase
comparator
output
R5
R4
Vcc1
Figure 3 : Line Oscillator
Line
Flyback
Sync pulse
Output
Current
Vc
Integrated
Flyback
Figure 4 : Phase Comparator
The sync-pulse drives the current in the compara-
tor. The line flyback integrated by the external net
work gives on pin 13 a saw tooth, the DC offset of
this saw tooth is fixed by VC. The comparator
output provides a positive current for the part of the
signal on pin 13 greater than to VC and a negative
current for the other part. When the line flyback and
the video signal are synchronized, the output of the
comparatoris an alternatively negative and positive
current. The frame sync-pulse inhibits the compa-
rator to prevent frequency drift of the line oscillator
on the frame beginning.
13
12
Vcc1
Vc
SL2
ST1
Figure 5
Line output (Pin 17)
It is an open-collector output. The output negative
pulse time is 22
µs for a 64µs period.
The oscillator thresholds are internally fixed by
resistors. The oscillator is synchronized during the
last half free run period. The input current during
the charge of the capacitor is less than 100nA.
TDA8215B
6/9


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