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LM1290 データシート(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1290
部品情報  Autosync Horizontal Deflection Processor
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1290 データシート(HTML) 7 Page - National Semiconductor (TI)

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Application Hints
1.
Phase Control for Geometry Correction: Pin 10
(PHASE) is designed to control static phase (picture
horizontal position) as well as dynamic phase for geom-
etry correction. Complete control of static and dynamic
phase can be achieved by superposing a correction
waveform (Sawtooth and/or parabola) on the DC control
voltage at pin 10 (see
Figure 12).
2.
Programmable Frequency Ramping: H frequency
transitions from high to low present a special problem for
deflection output stages without current limiting. If, dur-
ing such a transition, the output transistor on-time in-
creases excessively before the B+ voltage has de-
creased to its final level, then the deflection inductor
current ramps too high and the induced flyback pulse
can exceed the breakdown voltage, BV
CEX, of the output
transistor. To prevent this, the rate of change of the VCO
frequency must be limited.
Consider a scanning mode transition at t = 0 from f
1 to f2.
The VCO frequency as a function of time, f
VCO(t), is de-
scribed by the equation,
fVCO(t) f 1 +(f 2 − f 1) (1 – exp (−t /τ)),
where
τ = 40x103 xC
FVC.
The above equation can be used to predict VCO behav-
ior during frequency transitions, but in practice the value
of C
FVC is most easily determined empirically. In general,
large values minimize the chance of exceeding BV
CEX,
but generate long PLL capture times.
3. Phase Voltage Range vs Delay Time: The recom-
mended phase voltage range to use on pin 10 (PHASE)
depends on the delay time of the deflection output stage.
Delay time is defined as the time from the rising edge of
H Drive to the center of flyback. For best performance
the phase voltage range should be in the unshaded area
of
Figure 11.
Recommended Phase Voltage for 640 x 480 @ 60 Hz
DS012917-11
FIGURE 11.
www.national.com
7


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