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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TDA4863A Fiches technique(PDF) 6 Page - NXP Semiconductors |
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TDA4863A Fiches technique(HTML) 6 Page - NXP Semiconductors |
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6 / 20 page  2000 Aug 17 6 Philips Semiconductors Product specification Vertical deflection booster TDA4863J; TDA4863AJ FUNCTIONAL DESCRIPTION Both the TDA4863J and TDA4863AJ consist of a differential input stage, a vertical output stage, a flyback generator, a reference circuit and a thermal protection circuit. The TDA4863J operates with a separate flyback supply voltage (see Fig.1) while the TDA4863AJ generates the flyback voltage internally by doubling the supply voltage (see Fig.2). Differential input stage The differential sawtooth input signal (e.g. coming from the deflection controller family TDA485X) is connected to the inputs (inverted signal to pin 6 and non-inverted signal to pin 7). The vertical feedback signal is superimposed on the inverted signal on pin 6. 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 Tj > 150 °C this protection will be activated and will reduce then the deflection current (I5). Flyback generator The flyback generator supplies the vertical output stage during flyback. The TDA4863J is used with separate flyback supply voltage to achieve a short flyback time with minimized power dissipation. The TDA4863AJ needs a capacitor CF between pins 2 and 3 (see Fig.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 TDA4863AJ the resistor R6 in the positive supply line can be used to reduce the power consumption. In parallel with the deflection coil a damping resistor RP and an RC combination (RS1 = 5.6 Ω and CS1 = 100 nF) are needed. Furthermore, another additional RC combination (RS2 = 5.6 Ω and CS2 = 47 to 150 nF) can be used to minimize the noise effect and the flyback time (see Figs 9 and 10). |
Numéro de pièce similaire - TDA4863A |
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Description similaire - TDA4863A |
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