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TDA8214B Datasheet(PDF) 7 Page - STMicroelectronics

Part # TDA8214B
Description  HORIZONTAL AND VERTICAL DEFLECTION CIRCUIT
Download  9 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA8214B Datasheet(HTML) 7 Page - STMicroelectronics

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Vcc1
2
To frame amplifier
Frame
sync pulse
INPUT CURRENT
COMPENSATION
Figure 6 : Frame Oscillator
Frame output amplifier
This amplifier is able to drive directly the frame
yoke. Its output is short circuit and overload pro-
tected; it contains also a thermal protection.
The frame blanking is detected by the frame fly-
back generator. When the output voltage of the
frame amplifier exceeds VCC2-2VBE, the pulse is
detected. The line flyback detection is provided by
a comparator which compares the input line flyback
pulse to an internal reference. The burst gate pulse
position is fixed by the external RC network
(Pin 14). It is referenced to the middle of the line
flyback.
This stage will detect the coincidence between the
line sync pulse (if present) and a 2
µs sampling
pulse. This 2
µs pulse is positionned at the center
of line sync pulse when the phase loop is locked.
This sampled detection is stored by an external
capacitor Pin 8.
The identification output level is high when video
signal is present.
Important remark : minimum saw-tooth amplitude
on Pin 13 has to be 2VPP (typ. : 2.5VPP).
Vcc1
18
19
10
14
Line
Flyback
Input
Frame
Output
YOKE
Vcc1
RC
SSC
Output
RC
Network
Σ
400 µ A
Line
Flyback
Detection
Frame
Blanking
Detection
Burst gate
pulse
generator
Figure 7 : Super Sandcastle Generator
TDA8214B
7/9


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