參數(shù)資料
型號(hào)： TDA4867
廠(chǎng)商： NXP Semiconductors N.V.
英文描述： Full bridge current driven vertical deflection booster
中文描述： 全橋電流驅(qū)動(dòng)垂直偏轉(zhuǎn)助推器
文件頁(yè)數(shù)： 4/14頁(yè)
文件大小： 426K
代理商： TDA4867
2003 Feb 05
4
Philips Semiconductors
Preliminary specification
Full bridge current driven vertical
deflection booster
TDA4867J
PINNING
FUNCTIONAL DESCRIPTION
The TDA4867J consists of a differential input stage, two
output stages, a flyback generator, a protection circuit for
the output stages and a guard circuit.
Differential input stage
The differential input stage has a high CMRR differential
current mode input (pin INP and pin INN) that results in a
high electromagnetic immunity and is especially suitable
fordriverunitswithdifferential(e.g.TDA485xorSAA4856)
and single-ended current signals.
The differential input stage delivers the driver signals for
the output stages.
In combination with the SAA4856 the power save mode
can be achieved via the input pins without additional
components.
Output stages
Thetwooutputstagesarecurrentdriveninoppositephase
and operate in combination with the deflection coil in a full
bridgeconfiguration.Therefore,theTDA4867Jrequiresno
external coupling capacitor and operates with one supply
voltage (V
P
) and a separate adjustable flyback supply
voltage (V
FB
) only. The deflection current through the coil
(I
defl
) is measured with the resistor R
m
which produces a
voltage drop: U
rm
≈
R
m
×
I
defl
. At pin FEEDB a part of I
defl
is fed back to the input stage. The feedback input has a
current input characteristic which holds the differential
voltage between pin FEEDB and pin OUTB on zero.
Therefore the feedback current (I
FEEDB
) through R
ref
is:
R
R
ref
The input stage directly compares the driver currents into
pins INP and INN with the half of the feedback current
(I
FEEDB
). Any difference of this comparison leads to a more
or less driver current for the output stages. The relation
between the deflection current and the differential input
current (I
i(dif)
= I
INP
I
INN
) is:
R
m
ref
R
2
R
×
m
or:
The deflection current can be adjusted up to
±
1.25 A by
varying R
ref
when R
m
is fixed to 1
.
Flyback generator
The flyback generator supplies the output stage A during
flyback. This makes it possible to optimize power
consumption (supply voltage V
P
) and flyback time (flyback
voltage V
FB
) separately. Due to the absence of a
decoupling capacitor the flyback voltage is fully available.
In parallel with the deflection yoke and the damping
resistor (R
p
) an additional capacitor (C
SP
) and a series
resistor (R
SP
) have to be used. The flyback time can be
optimized depending on the value of C
SP
.
SYMBOL
PIN
DESCRIPTION
INP
INN
V
P
OUTB
GND
OUTA
V
FB
GUARD
1
2
3
4
5
6
7
8
non-inverted input
inverted input
supply voltage
output B
ground
output A
flyback supply voltage
guard output or power save
mode input
feedback input
FEEDB
9
handbook, halfpage
TDA4867J
MGU989
1
2
3
4
5
6
7
8
9
INP
INN
VP
OUTB
GND
OUTA
VFB
GUARD
FEEDB
Fig.2 Pin configuration.
I
FEEDB
---------
I
defl
×
≈
I
i dif
)
2
I
FEEDB
×
R
I
defl
×
2
×
≈
=
I
defl
I
i dif
)
-----------------
×
≈
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA4867J 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Full bridge current driven vertical deflection booster
TDA4881 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Advanced monitor video controller
TDA4881N 制造商:NXP Semiconductors 功能描述:
TDA4882 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Advanced monitor video controller for OSD
TDA4883 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Non-VGA Video Controller
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