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TDA4865AJ Datasheet(PDF) 4 Page - NXP Semiconductors

Part No. TDA4865AJ
Description  eflection boosters for use in vertical deflection systems for frame frequencies up to 200 Hz.
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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TDA4865J_TDA4865AJ_2
© NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 02 — 3 November 2006
4 of 18
NXP Semiconductors
TDA4865J; TDA4865AJ
Vertical deflection booster
6.2 Pin description
7.
Functional description
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 Figure 1) while the
TDA4865AJ generates the flyback voltage internally by doubling the supply voltage
(see Figure 2).
7.1 Differential input stage
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.
7.2 Vertical output and thermal protection
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
Tj > 150 °C the protection will be activated and will reduce the deflection current (IVOUT).
7.3 Flyback generator
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 (CF) connected between pins VP3 and VP2 (see
Figure 2). Capacitor CF is charged during scan, using the external diode D1 and resistor
R5. During flyback the cathode of capacitor CF is connected to the positive supply voltage
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.
Table 3.
Pin description
Symbol
Pin
Description
TDA4865J
TDA4865AJ
VP1
1
1
positive supply voltage 1
VFB
2
-
flyback supply voltage
VP3
-
2
flyback generator output
VP2
3
3
supply voltage 2 for vertical output
GND
4
4
ground or negative supply voltage
VOUT
5
5
vertical output
INN
6
6
inverted input of differential input stage
INP
7
7
non-inverted input of differential input stage




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