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TDA8357J Datasheet

  • TDA8357J

  • Full bridge vertical deflection output

  • 109.49KB

  • Philips

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Philips Semiconductors
Preliminary speci铿乧ation
Full bridge vertical de铿俥ction output circuit
in LVDMOS
Supply voltage calculation
For calculating the minimum required supply voltage,
several specific application parameter values have to be
known. These parameters are the required
maximum (peak) deflection coil current I
coil(peak)
, the coil
parameters R
coil
and L
coil
, and the measuring resistance
of R
M
. The required maximum (peak) deflection coil
current should also include the overscan.
The deflection coil resistance has to be multiplied with 1.2
in order to take account of hot conditions.
Chapter 鈥淐haracteristics鈥?supplies values for the voltage
losses of the vertical output stage. For the first part of the
scan the voltage loss is given by V
loss(1)
. For the second
part of the scan the voltage loss is given by V
loss(2)
.
The voltage drop across the deflection coil during scan is
determined by the coil impedance. For the first part of the
scan the inductive contribution and the ohmic contribution
to the total coil voltage drop are of opposite sign, while for
the second part of the scan the inductive part and the
ohmic part have the same sign.
For the vertical frequency the maximum frequency
occurring must be applied to the calculations.
The required power supply voltage V
P
for the first part of
the scan is given by:
V
P
(
1
)
=
I
coil
(
peak
)
脳 (
R
coil
+
R
M
)
鈥?/div>
L
coil
脳
2I
coil
(
peak
)
脳
f
vert
(
max
)
+
V
loss
(
1
)
The required power supply voltage V
P
for the second part
of the scan is given by:
V
P
(
2
)
=
I
coil
(
peak
)
脳 (
R
coil
+
R
M
)
+
L
coil
脳
2I
coil
(
peak
)
脳
f
vert
(
max
)
+
V
loss
(
2
)
The minimum required supply voltage V
P
shall be the
highest of the two values V
P(1)
and V
P(2)
. Spread in supply
voltage and component values also has to be taken into
account.
Flyback supply voltage calculation
If the flyback time is known, the required flyback supply
voltage can be calculated by the simplified formula:
R
coil
+
R
M
V
FB
=
I
coil
(
p
鈥?/div>
p
)
脳
--------------------------
-
鈥?/div>
t
FB
鈦?/div>
x
1
鈥?/div>
e
where:
L
coil
x
=
--------------------------
-
R
coil
+
R
M
TDA8357J
The flyback supply voltage calculated this way is about
5% to 10% higher than required.
Calculation of the power dissipation of the vertical
output stage
The IC total power dissipation is given by the formula:
P
tot
= P
sup
鈭?/div>
P
L
The power to be supplied is given by the formula:
I
coil
(
peak
P
sup
=
V
P
脳
-----------------------
)
+
V
P
脳
0.015 [A]
+
0.3 [W]
-
2
In this formula 0.3 [W] represents the average value of the
losses in the flyback supply.
The average external load power dissipation in the
deflection coil and the measuring resistor is given by the
formula:
(
I
coil
(
peak
)
)
P
L
=
-------------------------------
脳 (
R
coil
+
R
M
)
-
3
Example
Table 1
Application values
VALUE
0.725
1.45
8.82
7.9
1.5
50
640
Calculated values
VALUE
11
11
0.02
0.000802
29
4.45
1.93
2.52
V
W
W
W
V
鈩?/div>
s
UNIT
A
A
mH
鈩?/div>
鈩?/div>
Hz
碌s
UNIT
2
SYMBOL
I
coil(peak)
I
coil(p-p)
L
coil
R
coil
R
M
f
vert
t
FB
Table 2
SYMBOL
V
P
R
M
+ R
coil
(hot)
t
vert
x
V
FB
P
sup
P
L
P
tot
1999 Nov 10
10

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