參數(shù)資料
型號(hào)： TDA9112A
廠商： STMICROELECTRONICS
元件分類： 偏轉(zhuǎn)
英文描述： HORIZ/VERT DEFLECTION IC, PDIP32
封裝： PLASTIC, SDIP-32
文件頁(yè)數(shù)： 32/60頁(yè)
文件大小： 831K
代理商： TDA9112A
Obsolete
Product(s)
- Obsolete
Product(s)
TDA9112A
38/60
9.3.6
Output Section
The H-drive signal is inhibited (high level) during
flyback pulse, and also when VCC is too low, when
X-ray protection is activated (XRayAlarm IC-bus
flag set to 1) and when IC-bus bit HBOutEn is set
to 0 (default position).
The duty cycle of the H-drive signal is controlled
via IC-bus register
HDUTY. This is overruled dur-
ing soft-start and soft-stop procedures (see Section
9.3.7
and Figure 10).
The PLL2 is followed by a rapid phase shifting
which accepts the signal from H-moiré canceller
(see Section 9.3.8)
The output stage consists of a NPN bipolar tran-
sistor, the collector of which is routed to HOut pin
(see Figure 9).
Figure 9. HOut configuration
9.3.7
Soft-start and soft-stop on H-drive
The soft-start and soft-stop procedure is carried
out at each switch-on or switch-off of the H-drive
signal, either via HBOutEn IC-bus bit or after re-
set of XRayAlarm IC-bus flag, to protect external
power components. By its second function, the ex-
ternal capacitor on pin HPosF is used to time out
this procedure, during which the duty cycle of H-
drive signal starts at its maximum (tHoff for soft
start/stop in electrical specifications) and slowly
decreases to the value determined by the control
IC-bus register
HDUTY (vice versa at soft-stop).
This is controlled by voltage on pin HPosF. In case
of supply voltage switch off, the transients on HOut
and BOut have different characteristics. See
Figure 10
, Figure 11 and Section 9.8.1.
9.3.8
Horizontal moiré cancellation
The horizontal moiré canceller is intended to blur a
potential beat between the horizontal video pixel
period and the CRT pixel width, which causes vis-
ible moiré patterns in the picture.
It introduces a microscopic indent on horizontal
scan lines by injecting little controlled phase shifts
to output circuitry of the horizontal section. Their
amplitude is adjustable through
HMOIRE IC-bus
control.
The behaviour of horizontal moiré is to be opti-
mized for different deflection design configurations
using HMoiréMode IC-bus bit. This bit is to be
kept at 0 for common architecture (B+ and EHT
common regulation) and at 1 for separated archi-
tecture (B+ and EHT each regulated separately).
The maximum amplitude adjustable though
HMOI-
RE IC-bus control is optimized according to selec-
tion by HMoiréMode IC-bus bit: larger when B+
and EHT are each regulated separately, smaller
when B+ and EHT are common regulation.
int.
ext.
HOut
26
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