TOSHIBA TA8751AN
TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC
TA8751AN
AUTOMATIC KINE BIAS (AKB)
RGB INTERFACE+
TA8751AN possesses functions that optimize the CRT
drive conditi
ons in televisions, and is an IC thatautomates the previously complex cutoff adjustment and
drive adjustment non-adjustment. .
It has an RGB TEXT input pin, so TV signal and TEXT ignal can be switched between rapidly.
AKB (AUTOMATIC KINE BIAS) Circuits take the previously complex adjustment of CRT drive
circuits and automates by absorbing the 3-color dispersion of the CRT. It is therefore
necessary to design the CRT drive circuit in an AKB centered state to allow efficient
absorption of the CRT's dispersion.
The primary color input on the TV side takes the form of DC coupling, so please set input
levels so that the contrast control and brightness control in previous stages are under the
following conditions in the center.
The TV's primary colors are DC coupled, so brightness
control from previous stages can be utilized.
hen the power is off and the CRT is
not warmed up, as a beam current
does not flow to cutoff and drive
detection interval, voltage is not
obtainable from the sense pin.
Accordingly, for operation so that
current flows to the CRT for both cut
adjustment and drive adjustment, the
CRT starts from a white screen the
instant it warms up.
In order to prevent this, the soft start
circuit returns the output DC voltage
and operates so that if pin 17 exceeds
a fixed value, cutoff adjustment is
fixed on the black side.
Vertical blanking input
Input pin for the vertical blanking
pulse that determines the timing of
the reference pulse for the cutoff
adjustment and drive adjustment.
The first 2H interval
after the leadingedge of the vertical blanking is the
cutoff reference level, while the next
2H interval is the drive reference
level.
H timing is created by the horizontal
blanking of pin 14.
B sense
G sense
R sense
Detection pin for the CRT beam
current.
The current that flows to the CRT
cathode as a result of the reference
pulse inserted for cutoff adjustment
and drive adjustment is converted to a
voltage and detected by detection
resistance. White balance can be
changed by varying detection
resistance.
The internal comparator operates in
tune with the timing of the reference
pulse.
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