tda4865j NXP Semiconductors, tda4865j Datasheet - Page 4

• Manufacturer Part Number: tda4865j
• Description: Eflection Boosters For Use In Vertical Deflection Systems For Frame Frequencies Up To 200 Hz.
• Manufacturer: NXP Semiconductors

NXP Semiconductors
7. Functional description
TDA4865J_TDA4865AJ_2
Product data sheet
6.2 Pin description
7.1 Differential input stage
7.2 Vertical output and thermal protection
7.3 Flyback generator
Table 3.
Both the TDA4865J and TDA4865AJ consist of a differential input stage, a vertical output
stage, a flyback generator, a reference circuit and a thermal protection circuit.
The TDA4865J operates with a separate flyback supply voltage (see
TDA4865AJ generates the flyback voltage internally by doubling the supply voltage
(see
The differential sawtooth input current signal (from the deflection controller) is connected
to the inputs (inverted signal to pin INN and non-inverted signal to pin INP). The vertical
feedback signal is superimposed on the inverted signal on pin INN.
The vertical output stage is a quasi-complementary class-B amplifier with a high linearity.
The output stage is protected against thermal overshoots. For a junction temperature of
T
The flyback generator supplies the vertical output stage during flyback.
The TDA4865J is used with a separate flyback supply voltage to achieve a short flyback
time with minimized power dissipation.
The TDA4865AJ needs a capacitor (C
Figure
R5. During flyback the cathode of capacitor C
and the flyback voltage is then twice the supply voltage. For the TDA4865AJ the
resistor R6 in the positive supply line can be used to reduce the power consumption.
Symbol
V
V
V
V
GND
VOUT
INN
INP
j
P1
FB
P3
P2
> 150 C the protection will be activated and will reduce the deflection current (I
Figure
2). Capacitor C
Pin description
Pin
TDA4865J
1
2
-
3
4
5
6
7
2).
Rev. 02 — 3 November 2006
F
is charged during scan, using the external diode D1 and resistor
TDA4865AJ
1
-
2
3
4
5
6
7
F
Description
positive supply voltage 1
flyback supply voltage
flyback generator output
supply voltage 2 for vertical output
ground or negative supply voltage
vertical output
inverted input of differential input stage
non-inverted input of differential input stage
) connected between pins V
TDA4865J; TDA4865AJ
F
is connected to the positive supply voltage
Vertical deflection booster
P3
Figure
and V
© NXP B.V. 2006. All rights reserved.
P2
1) while the
(see
VOUT
4 of 18
).