參數(shù)資料
型號(hào)： TDA9111
廠商： 意法半導(dǎo)體
英文描述： LOW-COST I2C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITOR
中文描述： 低費(fèi)用的I2C可控?fù)隙榷嗤斤@示器處理器
文件頁(yè)數(shù)： 33/43頁(yè)
文件大?。?/td> 493K
代理商： TDA9111
TDA9111
33/43
3.7 Dynamic Horizontal Phase Control
I
OUT
= K4 (V
OUT
-
V
DCMID
) + K5 (V
OUT
-
V
DCMID
)
2
K4 is adjustable by the parallelogram I
2
C register.
K5 is adjustable by the side pin balance I
2
C regis-
ter.
4 DC/DC CONVERTER PART
This unit controls the switch-mode DC/DC con-
verter. It converts a DC constant voltage into the
B+ voltage (roughly proportional to the horizontal
frequency) necessary for the horizontal scanning.
This DC/DC converter can be configured either in
step-up or step-down mode. In both cases it oper-
ates very similarly to the well known UC3842.
4.1 Step-up Mode
Operating Description
– The power MOS is switched ON during the fly-
back (at the beginningof thepositiveslope ofthe
horizontal focus sawtooth).
– The power MOS is switched OFF when its cur-
rent reaches apredetermined value. For this pur-
pose, a sense resistor is inserted in its source.
The voltage on this resistor is sent to Pin16
(I
SENSE
).
– The feedback (coming either from the EHV or
from the flyback) is divided to a voltage close to
5.0V and compared to the internal 5.0V refer-
ence (I
VREF
). The difference is amplified by an
error amplifier, the output of which controls the
power MOS switch-off current.
Main Features
– Switching synchronized on the horizontal fre-
quency,
– B+ voltage always higher than the DC source,
– Current limited on a pulse-by-pulse basis.
The DC/DC converter is disabled:
– when V
CC
or V
DD
are too low,
– when X-Ray protection is latched,
– directly through I
2
C bus.
When disabled, BOUT is driven to GND by a
0.5mA current source. This feature allows to im-
plement externally a soft start circuit.
4.2 Step-down Mode
In step-down mode, the I
SENSE
information is not
used any more and therefore not sent to the
Pin16. This mode is selected by connecting this
Pin16 to a DC voltage higher than 6V (forexample
V
REF-V
).
Operating Description
– The power MOS is switched ON as for the step-
up mode.
– Thefeedback to theerror amplifier is done as for
the step-up mode.
– The powerMOS is switched OFFwhen the HFO-
CUSCAP voltage gets higher than the error am-
plifier output voltage.
Main Features
– Switching synchronized on the horizontal fre-
quency,
– B+ voltage always lower than the DC source,
– No current limitation.
4.3 Step-up and Step-down Mode Comparison
In step-down mode the control signal is inverted
compared with the step-up mode.This, for the fol-
lowing reason:
– Instep-up mode, the switch is a N-channel MOS
referenced to ground and made conductive by a
high level on its gate.
– In step-down, a high-side switch is necessary. It
can be either a P- or a N-channel MOS.
For a P-channel MOS, the gate is controlled
directly from Pin 28 through a capacitor (this
allows to spare a Transformer). In this case,
a negative-going pulse is needed to make
the
MOS
conductive.
necessary to invert the control signal.
For a N-channel MOS, a transformer is
needed to control the gate. The polarity of
the transformer can be easily adapted to the
negative-going control pulse.
Therefore
it
is
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