TDA4861 Datasheet, PDF (3/12 Pages) NXP Semiconductors – Vertical deflection power amplifier for monitors

Philips Semiconductors
Vertical deflection power amplifier for
monitors
BLOCK DIAGRAM
Product specification
TDA4861
handbook, full pagewidth
VOLTAGE
STABILIZER
VERTICAL
DRIVER
TDA4861
THERMAL AND
SOAR
PROTECTION
FLYBACK
DRIVER
DIFFERENTIAL
INPUT
AMPLIFIER
VERTICAL
OUTPUT
FLYBACK
GENERATOR
PULSE
CIRCUIT
+8.8 V
150 kΩ
1
2
VP1
470
µF
from TDA4850
1 MΩ
V-shift
3
BAX13
4
5
VP2 V-OUT
6
SUB
270 Ω
1.8 kΩ
1.8 kΩ
R1
1Ω
5.6 Ω
0.1 µF
yoke
470 µF
VN
−8.1 V
7
8
9
FLB
VP3
PCO
470 µF
4.3 Ω
10 kΩ RPCO
+52 V
MHA612
Assumed values:
I_yoke = 1.42 A.
R_yoke = 4.17 Ω + 7% + ∆R(T) = 6.12 Ω.
L_yoke = 5.25 mH.
R₁ = 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 µs.
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_P3 from an external source.
Deflection frequency range from 50 to 100 Hz.
1997 Jan 20
3