TDA8214B Datasheet, PDF (7/9 Pages) STMicroelectronics – HORIZONTAL AND VERTICAL DEFLECTION CIRCUIT

Figure 6 : Frame Oscillator
INPUT CURRENT
COMPENSATION
2
TDA8214B
Vcc1
Frame
sync pulse
To frame amplifier
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
Figure 7 : Super Sandcastle Generator
flyback.
This stage will detect the coincidence between the
line sync pulse (if present) and a 2µs sampling
pulse. This 2µs 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).
Line
Vcc1
Flyback
Input
Line
18
Flyback
Σ
RC
Detection
Frame
Output
Frame
Burst gate
Vcc1
10
Blanking
pulse
19
SSC
Output
YOKE
Detection
generator
400 µ A
RC
Network
14
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