Philips TDA4861 - Manual (Page 3)

1997 Jan 20 3
Philips Semiconductors Product specification
Vertical deflection power amplifier for
monitors
TDA4861
BLOCK DIAGRAM
Fig.1 Block diagram and application circuit with flyback supply voltage V
P3
from an external source.
Deflection frequency range from 50 to 100 Hz.
Assumed values:
I
yoke
= 1.42 A.
R
yoke
= 4.17
Ω
+ 7% +
∆
R(T) = 6.12
Ω
.
L
yoke
= 5.25 mH.
R
1
= 1.0
Ω ±
1%.
T
amb
= 65
°
C.
T
j(max)
= 105
°
C.
T
yoke
= 75
°
C.
P
yoke
= 1.2 W.
P
IC
= 1.8 W.
P
tot
= 3.0 W.
t
pFLB
= typically 250
µ
s.
Attention: the heatsink of the IC must be isolated against ground (it is connected to pin 6).
handbook, full pagewidth
MHA612
yoke
470
µ F
0.1 µ F
470 µ F
470
µ
F
1 M
Ω
150 k
Ω
270 Ω
4.3 Ω
10 k Ω
1.8 k Ω
BAX13
−
8.1 V
+
52 V
R1
1 Ω
1.8 k Ω
5.6 Ω
VP2 VP3
8 7 6 5 4 3 2 1 9
PCO
RPCO
VN
VP1 V-OUT SUB FLB
DIFFERENTIAL
INPUT
AMPLIFIER
VOLTAGE
STABILIZER
VERTICAL
DRIVER
from TDA4850
V-shift
+
8.8 V
VERTICAL
OUTPUT
TDA4861
THERMAL AND
SOAR
PROTECTION
FLYBACK
GENERATOR
FLYBACK
DRIVER
PULSE
CIRCUIT