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Philips Semiconductors
Vertical deflection power amplifier for
monitors
BLOCK DIAGRAM
handbook, full pagewidth
VOLTAGE
STABILIZER
1
V P1
8.8 V
150 k
from TDA4850
1 M
V-shift
Assumed values:
I
= 1.42 A.
yoke
R
= 4.17
+ 7% + R(T) = 6.12 .
yoke
L
= 5.25 mH.
yoke
R
= 1.0
1%.
1
T
= 65 C.
amb
T
= 105 C.
j(max)
T
= 75 C.
yoke
P
= 1.2 W.
yoke
P
= 1.8 W.
IC
P
= 3.0 W.
tot
t
= typically 250 s.
pFLB
Attention: the heatsink of the IC must be isolated against ground (it is connected to pin 6).
Fig.1
Block diagram and application circuit with flyback supply voltage V
Deflection frequency range from 50 to 100 Hz.
1997 Jan 20
TDA4861
VERTICAL
DRIVER
DIFFERENTIAL
INPUT
AMPLIFIER
2
3
BAX13
470
F
270
1.8 k
1.8 k
THERMAL AND
SOAR
PROTECTION
VERTICAL
OUTPUT
4
5
6
V P2
V-OUT
SUB
5.6
0.1 F
yoke
470 F
R1
V N
1
8.1 V
3
Product specification
FLYBACK
DRIVER
FLYBACK
PULSE
GENERATOR
CIRCUIT
7
8
9
FLB
V P3
470 F
10 k
4.3
52 V
from an external source.
P3
TDA4861
PCO
R PCO
MHA612
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