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 VP3 from an external source.
Deflection frequency range from 50 to 100 Hz.
Assumed values:
Iyoke= 1.42 A.
Ryoke= 4.17 Ω+7%+∆R(T)= 6.12 Ω.
Lyoke= 5.25 mH.
R1=1.0 Ω±1%.
Tamb=65°C.
Tj(max)= 105 °C.
Tyoke=75°C.
Pyoke= 1.2 W.
PIC= 1.8 W.
Ptot= 3.0 W.
tpFLB= typically 250 µs.
Attention: the heatsink of the IC must be isolated against ground (it is connected to pin6).
handbook, full pagewidth
MHA612
yoke
470
µF0.1 µF
470 µF
470 µF
1 MΩ
150 kΩ270 Ω
4.3 Ω10 kΩ
1.8 kΩ
BAX13
−8.1 V +52 V
R1
1 Ω
1.8 kΩ
5.6 Ω
VP2 VP3
87654321 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